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✓ 246 calculators✓ Updated 2026✓ Free & private

Featured calculators

Hand-picked tools you won't find everywhere else.

Finance

Salary, severance, loans, taxes, compound interest.

401(k) Contribution & Match Calculator Calculate your 2026 401(k) employee contribution, employer match, and projected year-end balance. IRS limit: $24,500 (under 50), $32,500 (50+), $35,750 (60-63).

Argentina Aguinaldo (SAC) Calculator Calculate your Argentine aguinaldo (13th-month bonus): gross SAC based on best salary of the semester, 17% deductions, and proportional months worked.

Airbnb Short-Term Rental Net Profit Calculator 💰 Calculate net profit from Airbnb rentals: deduct commissions, expenses, taxes. Free calculator for 2026.

Crypto Airdrop Earnings Calculator: What Did You Really Make Per Hour? Calculate your true hourly return from crypto airdrops. Compare your result against Uniswap ($150/hr), Arbitrum ($67/hr), and Optimism ($160/hr) historical benchmarks. Was it worth it?

DeFi APY Calculator — Aave & Compound Stablecoin Yield Calculate your stablecoin lending yield on Aave V3 and Compound V3 with daily compounding. Enter amount, APY %, and days — see earnings and final value instantly.

Deregister Your Car for Scrapping Calculate deregistration costs for scrapped vehicles instantly and free. Stop paying registration fees. Estimate vehicle scrap & DNRPA fees.

Car Loan Monthly Payment Calculator Calculate your exact auto loan monthly payment with sales tax, trade-in, and down payment. Average APR 2026: 7.5% new / 11.5% used.

CEDEAR Ratio Converter: Apple vs. Microsoft Calculate CEDEAR conversion ratios between Apple and Microsoft stocks. Free tool updated 2026.

Child Support Payment Calculator Calculate estimated child support payments based on salary and number of children. Free calculator using typical state guidelines for 2026.

Compound Interest Calculator Calculate compound interest with monthly contributions. See end balance, total interest earned, and a year-by-year breakdown using the A=P(1+r/n)^(nt) formula.

Credit Card Payoff Calculator Calculate months to pay off your credit card balance. Enter balance, APR, and monthly payment to see total interest and payoff timeline.

FBI Criminal Background Check Cost 2026 (+ State & Employment Checks) FBI criminal background check cost 2026: $18 Identity History Summary + $25–$50 Channeler fee. Compare state police checks ($5–$61) and FCRA screens ($25–$100).

Currency Converter: Enter Your Rate, Get the Exact Amount Convert any currency amount using the exact exchange rate you enter — from your bank, broker, or a live quote. Instant result + inverse rate. No stale data, ever.

Debt Snowball Payoff Calculator See exactly when you'll be debt-free using the snowball method. Enter up to 5 debts, add an extra monthly payment, and get your step-by-step payoff order, interest saved, and months cut vs. minimums-only.

Discount Calculator — Percent Off & Stacked Deals Enter any original price and one or two discount percentages. Get the exact final price, how much you save, and the real combined rate when two discounts stack (it's never the simple sum).

Emergency Fund Calculator Calculate your ideal emergency fund target. Enter monthly expenses, job type, and dependents to get a personalized 3–12 month savings goal in dollars.

Employee vs Freelance: Annual Income Comparison Calculate your potential earnings as a freelancer vs employee. Compare annual net income with real 2026 rates.

Estimate Estate Settlement Costs & Attorney Fees Calculate total estate settlement costs including attorney fees, taxes & court fees. Free tool updated for 2026.

Ethereum Gas Fee Calculator Instantly estimate Ethereum gas fees in ETH and USD. Enter gas price (gwei) and ETH price to get the exact cost for transfers, ERC-20, Uniswap swaps, NFT mints, and DeFi — plus Layer 2 savings.

Federal Income Tax Calculator 2026 (USA) Calculate your 2026 US federal income tax using updated brackets (10–37%). Estimate tax owed, effective rate, marginal rate, and refund or balance due.

FIRE Number Calculator (Retire Early) Calculate your FIRE number using the 25× rule (4% SWR). Estimate years to financial independence, gap to target, and compare Lean, Standard, Fat & Coast FIRE.

Fixed Deposit Net Annual Returns Calculate fixed deposit net returns after taxes. Free instant calculator for your savings.

Foreign Residency & ID Cost Calculator Calculate Argentina foreigner residency & ID costs (temporary/permanent). Free estimator updated for 2026.

Home Affordability Calculator Calculate the maximum home price you can afford based on income, debts, and down payment. Uses 28%/36% DTI rules and 2026 mortgage rates.

Argentina Severance Pay Calculator (Dismissal Without Cause) Calculate Argentine severance pay for unjust dismissal: Art. 245 seniority, notice period, month integration, proportional SAC, and unused vacation.

Find Interest Rate Arbitrage Opportunities Compare HYSA, CD, T-Bill and MMF rates side-by-side. See how much you're losing in a 0.01% Chase or BofA account vs a 4.50%+ high-yield alternative.

VAT / Sales Tax Calculator Add or remove VAT/sales tax from any price. Supports multiple tax rates (10.5%, 21%, 27%). See net price, tax amount, and total instantly.

Compare Your Salary to the 2026 Minimum Wage Calculate how your salary compares to the 2026 minimum wage. See how many times the minimum wage you earn and how much above minimum you are.

Mortgage Payment Calculator (Monthly) Calculate your monthly mortgage payment. Estimate P&I, taxes, insurance, and PMI. Compare 15, 20, and 30-year fixed-rate loans instantly.

Calculate NFT Creator Royalties Calculate how much royalty an NFT creator earns from secondary market sales. Track earnings with our free calculator updated for 2026.

Overtime Pay Calculator Calculate overtime pay instantly. Enter your hourly rate and hours to see regular pay, time-and-a-half (1.5×), double time (2×), and total gross pay — with a reference table.

Passive Income From Investments Calculator Estimate monthly passive income from bonds, dividend stocks, REITs, HYSA & T-Bills. Compare yield-only vs 4% rule with 2026 tax impact.

Paycheck Take-Home Pay Calculator (USA) Calculate your net take-home pay after federal taxes, FICA, state tax, 401(k), and health insurance deductions. 2026 IRS brackets included.

Perpetual Futures P&L Calculator — Long & Short with Leverage Calculate your exact profit or loss on perpetual futures positions. Enter entry price, exit price, notional size, leverage and direction (long/short). Instant P&L + ROE.

Loan Payment Calculator Calculate your monthly loan payment, total interest and amortization schedule. Works for personal loans, auto loans and mortgages.

Property Deed Transfer Costs 2026 Calculate property deed & transfer costs in Argentina 2026: notary fees, taxes & stamp duty. Fast & free calculator for CABA/PBA.

Rent vs. Buy Calculator (5-Year Horizon) Calculate the 5-year net cost of renting vs. buying a home. Compare total ownership costs against rent plus opportunity cost to find your break-even year.

Risk-Reward Ratio Calculator (R:R) Calculate your risk-reward ratio in seconds: enter your entry, stop-loss and take-profit to get the exact R:R, minimum win rate to break even, and total P&L. Professional minimum: 1:2.

ROI Calculator — Total Return & Annualized Rate (CAGR) Calculate ROI instantly: enter your initial investment and final value to get total return on investment %, net profit, and annualized ROI (CAGR). Free, no sign-up.

Sales Tax Calculator Free sales tax calculator. Add sales tax to a price or back the tax out of a tax-inclusive total. Enter amount and rate to get tax, subtotal, and total instantly.

Savings Goal Calculator Calculate the monthly savings amount needed to reach any financial goal. Enter your target, current balance, time horizon, and APY to get your required monthly…

Calculate Your ETH Staking Rewards Calculate ETH staking rewards and annual yield. Estimate your Ethereum APY with real-time prices and maximize staking earnings.

Student Loan Payoff Calculator Calculate how extra monthly payments cut your student loan payoff time. Compare months to payoff, total interest paid, and your exact payoff date.

Argentina Salary Calculator (Gross to Net) Calculate net salary in Argentina 2026: gross to net with income tax, pension and social contributions. Updated official rates.

IRR and NPV Calculator for Investment Projects Calculate IRR (Internal Rate of Return) and NPV (Net Present Value) for any investment. Enter initial outlay, annual cash flow, and discount rate — get an instant verdict on whether the project beats your opportunity cost.

Health

BMI, calories, body fat, pregnancy, fitness.

A1c to Average Glucose (eAG): Calculator + Conversion Chart Convert your A1c percentage to estimated average glucose in mg/dL. ADA-endorsed Nathan formula (eAG = 28.7 × A1c − 46.7) plus a full A1c-to-mg/dL chart, GMI and CGM Time-in-Range context.

Waist Circumference Cardiovascular Risk Calculator Enter your waist measurement and instantly see your cardiovascular risk level per WHO and IDF thresholds. Men: increased risk ≥94 cm; women: ≥80 cm. No sign-up needed.

How much added sugar per day? WHO limit calculator Calculate grams of added sugar in any serving using its weight and label percentage. WHO limits: max 50 g/day (10% of calories), ideal target 25 g/day (5% — about 6 teaspoons).

How Much Sleep Do Adults Need by Age? AASM/NSF guidelines: adults 18–64 need 7–9 hours; adults 65+ need 7–8 hours. Enter your age (and current sleep) to get your recommended range and a personalised interpretation.

Is your AMH normal for your age? Interpret your result Enter your AMH level (ng/mL) and age. The calculator compares your result against age-adjusted reference ranges (Seifer et al. 2011 / ASRM) and tells you if your ovarian reserve is low, normal, or high — with a reference table, worked example, and next-step guidance.

Baby Name Meaning Finder — Origin, Popularity & Variants Type any baby name and instantly see its meaning, origin, and popularity. Includes a table of the top 20 most popular names with meanings for 2025–2026.

Basal Body Temperature & Ovulation Detection Track your daily basal body temperature to detect the biphasic pattern that indicates ovulation. Natural fertility awareness tracking method.

BMR Calculator — Mifflin-St Jeor Equation Calculate your Basal Metabolic Rate instantly with the Mifflin-St Jeor formula. Get your BMR + TDEE by activity level. Includes reference table for men and women by age and weight.

Basal Metabolic Rate (BMR) and TDEE Calculator BMR calculator: calculate your basal metabolic rate (BMR) and total daily energy expenditure (TDEE) using Mifflin-St Jeor. Calories to lose, maintain, or gain.

Breastfeeding Calories Calculator — Extra kcal/day by Nursing Type How many extra calories do you need while breastfeeding? Exclusive nursing adds ~500 kcal/day. Enter your weight and activity level to get your personalized total in seconds.

Walking Calories Calculator Walking calories: how many calories do you burn walking? Calculation based on METs adjusted for speed, weight, and slope. With food equivalents.

TDEE Calorie Calculator (Total Daily Energy Expenditure) Calculate your daily calorie expenditure (TDEE) using Mifflin-St Jeor: calories to maintain, lose, or gain weight based on age, sex, activity, and weight.

Calories Burned Doing Household Chores (Calculator + Table) Calculate exactly how many calories you burn cleaning, vacuuming, gardening, or cooking by weight and duration. Uses MET values from Ainsworth's Compendium of Physical Activities — the CDC gold standard.

How Tall Will My Child Be? Adult Height Predictor Predict your child's adult height from the parents' heights with the Tanner mid-parental formula. Free calculator + height chart by parents and a ±8.5 cm range.

How Much Protein Per Day? Daily Protein Intake Calculator How much protein do you need per day? Enter your weight and goal to get your grams/day. Active adults: 0.5–0.7 g/lb; muscle gain: 0.7–1.0 g/lb; cutting: ~0.8–1.1 g/lb. Free table included.

How Much Sodium Per Day? Daily Limits by Health Condition How much sodium per day? 2,300 mg for healthy adults, 1,500 mg with hypertension, kidney disease or diabetes. Full table by profile + salt conversion (WHO & AHA).

How Much Water Should You Drink Per Day? (By Body Weight) How much water should you drink a day? Enter your weight to get your target in liters, fl oz, and cups. Uses the 35 ml/kg baseline (NAM) plus add-ons for exercise, hot climate, pregnancy, and breastfeeding — with a quick-reference chart.

Embryo Implantation Calculator: When Does It Happen? Find your embryo implantation window by DPO or IVF transfer date. See the most likely implantation day, when to test, and early symptoms — based on Wilcox 1999.

Flexitarian Diet Macro Calculator — Daily Protein, Fat & Carbs Calculate your exact macros for the flexitarian diet: 20% protein, 30% fat, 50% carbs. 5 plant-based days + 2 meat/fish days. Instant results, free.

Food Satiety Index Calculator Free satiety index calculator 2026 for 24+ foods (Holt 1995). White bread = 100. Pick high SI foods to feel full longer per calorie. Calculate now.

Body Fat Percentage Calculator (US Navy Method) Calculate your body fat percentage using the US Navy method with just a tape measure. No scale, no equipment. Classified by ACE standards.

Caloric Deficit Calculator for Healthy Weight Loss Calculate exactly how many calories to cut per day to lose weight safely. Enter current weight, goal weight and weeks — get your daily deficit and whether your pace is healthy or aggressive.

Ideal Weight for Women by Height (Devine, Robinson & Hamwi) Find your ideal weight for women by height using three evidence-based formulas (Devine, Robinson, Hamwi). Includes a reference chart from 5'0" to 6'0" and frame size adjustments.

BMI Calculator (Body Mass Index) Calculate your BMI with weight and height: WHO category, healthy weight range, and how far you are from it. Instant results, no sign-up required.

Lean Body Mass (LBM) Calculator Calculate your lean body mass (LBM) in kg and lb using the Boer formula. Get fat mass, body fat %, and lean mass % instantly — used for protein targets and drug dosing.

Carnivore Diet Macros Calculator Calculate carnivore diet macros: 30% protein / 70% fat / 0% carbs. Reference table from 1,500 to 4,000 kcal. Strict carnivore, nose-to-tail, and lion diet explained.

IIFYM Calculator — If It Fits Your Macros (Flexible Diet) Calculate your IIFYM macros instantly: 30% protein, 30% fat, 40% carbs on your daily calorie target. Includes 80/20 flexible allowance and a reference table for common calorie goals.

Low-FODMAP Macro Calculator for IBS & SIBO Calculate your low-FODMAP macros in seconds: 20% protein, 30% fat, 50% tolerated carbs (Monash protocol). Includes a food list and comparison table. Backed by 70% IBS symptom improvement evidence.

Mediterranean Diet Macro Calculator (15-35-50) Calculate your Mediterranean diet macros: 15% protein, 35% healthy fat (olive oil & fish), 50% whole-grain carbs. Reference table for 1500–3000 kcal. PREDIMED-proven.

Calculate Your Macros for Recomposition, Cutting, and Bulking Evidence-based macro calculator for body recomposition, cutting, and lean bulking. Built on ISSN protein guidelines and Helms/Aragon recomp framework. Updated May 2026.

Mediterranean Diet Weekly Meal Plan Calculator Calculate your personalized Mediterranean diet weekly plan: calorie-adjusted servings by food group, macronutrient breakdown, and weekly portions based on the Mediterranean Diet Pyramid 2020.

Ovulation and Menstrual Cycle Calendar Calculator Calculate your ovulation day and 6-day fertile window in seconds. Enter your cycle length to predict your most fertile days and plan pregnancy naturally.

Ideal Weight Calculator by Height and Sex Calculate your ideal weight by height and sex using Devine, Robinson, Miller and Hamwi formulas. Instant results with healthy ranges.

Postpartum Weight Loss Timeline Calculator How long does it take to lose baby weight? Enter your pre-pregnancy and current weight to get a realistic postpartum timeline. You lose ~5–6 kg at birth; the rest takes 6–12 months at 0.5 kg/week.

How Often Should You Do Pilates Reformer Per Week? Find out your ideal Pilates Reformer frequency per week based on your goal: toning (3-4x), posture (2-3x), maintenance (2x), injury recovery, or postpartum. Evidence-based recommendations + full table.

Pregnancy Due Date Calculator (EDD) Calculate your estimated due date (EDD) in seconds using your last menstrual period (LMP). Get gestational week, trimester, and days remaining with Naegele's…

TDEE Calculator (Mifflin-St Jeor) How many calories do you burn per day? Calculate your TDEE with the Mifflin-St Jeor formula — get your maintenance, cutting and bulking calories, plus an activity-factor table.

Normal Triglyceride Levels: What Do Your Numbers Mean? Enter your triglyceride result (mg/dL or mmol/L) and instantly see if it's normal, borderline high, high, or very high per NCEP ATP III / AHA guidelines — with a full reference chart.

Vegan Diet Macros Calculator 🩺 Vegan diet macros: 20% protein, 25% fat, 55% carbs. Calculate grams needed daily. Free plant-based nutrition calculator.

Vegan Macro Calculator with Plant Protein Source Guide Calculate your daily macros for a vegan diet: protein, fat, and carbs based on your weight, height, age, activity level, and goal. Includes how many grams of each plant protein source you need daily. Free, no sign-up.

Cooper 12-Minute Run Test — VO2 Max Calculator Enter distance covered in 12 minutes (miles, km, or meters) to instantly estimate your VO2 max in ml/kg/min and see your fitness category (Very Poor to Superior) against Cooper Institute norms for your age and sex.

How Many Sets Per Week for Muscle Growth? Hypertrophy Volume Calculator Calculate the exact weekly set range for each muscle group to maximize hypertrophy. Based on Schoenfeld's evidence-based guidelines. Get minimum, optimal, and maximum tolerable sets in seconds.

When to Take a Pregnancy Test: Reliable Results Pregnancy test timing calculator: enter your last period to find the earliest reliable day for blood or urine testing. Avoid false negatives.

Daily Zinc Requirement: How Much Zinc Do You Need? Zinc RDA: 11 mg/day for men, 8 mg/day for women — more if pregnant or vegetarian. Enter your profile for your exact daily target plus the best food sources and supplement guide.

Business

Margins, VAT, markup, break-even, pricing.

Profit Margin & Markup Calculator Calculate profit margin and markup from cost and selling price. Understand the critical difference between margin on cost vs margin on sale. Free, instant.

Daily Life

Age, dates, percentages, rule of three, converters.

Days Between Two Dates Calculator Calculate the exact number of days, business days, weeks, months, and years between any two dates. Handles leap years automatically. Free, instant.

Exact Age Calculator Age calculator: find out how old you are — or how old anyone is — in exact years, months, days, hours, and minutes. Enter a date of birth and get your precise age instantly. Free, no signup.

Percentage Calculator Calculate any percentage: discounts, increases, percentage change, and what percent one number is of another. Formula shown step-by-step. Free, no signup.

Tip Calculator Calculate tips instantly and split bills among friends. Standard 18-20% US tipping rates, custom percentages, and per-person totals. Free tip splitter.

Rule of Three Calculator Solve direct and inverse rule of three problems. The basis for percentages, scales, conversions, and proportions. With everyday examples step by step.

Wedding Budget Calculator Calculate your wedding budget by category. Estimate venue, catering, photos & more. Average US wedding costs $33,000–$35,000 in 2026—see exactly where your money goes.

Sports

Pace, 1RM, calories burned, running, strength training.

Estimate Your 10K Time Based on Your 5K Performance Predict your 10K running time from your 5K pace using Riegel's formula. Free, accurate running pace calculator.

Bench Press 1RM Estimator Calculate your bench press one-rep max using the Brzycki formula. Free strength training calculator.

1RM Calculator (One Rep Max) 🏋️ Free 1RM calculator using the Epley formula. Enter any weight and reps and get your estimated one rep max plus 3RM, 5RM, 8RM, 10RM and 12RM for programming.

1RM Back Squat Calculator — Estimate Your Max (Epley Formula) Enter weight and reps to instantly estimate your back squat 1-rep max using the Epley formula. Includes a %1RM table and strength standards for novice to elite lifters.

Half Marathon (13.1 mi / 21K) Training Plan Length Calculator How many weeks to train for a 13.1-mile half marathon by background: beginner 16-20, intermediate 12-14, advanced 10-12. Jack Daniels VDOT + Hal Higdon based.

Cycling Calories Burned Cycling calories: calculate kcal burned pedaling based on speed (leisure, moderate, race, spinning, MTB), weight, and time. With estimated km traveled.

Calories Burned by Sport & Activity Calculate calories burned per sport: running, soccer, weightlifting, swimming, CrossFit, tennis, and yoga. Based on the MET Compendium of Physical Activities.

Swimming Calories Burned Calculator by Style Calculate calories burned swimming by style (crawl, breaststroke, backstroke, butterfly), weight, and duration. Includes MET table for all strokes and comparison with other sports.

Caloric Surplus Calculator for Muscle Gain Find your exact daily calories for bulking: TDEE + proven surplus by experience level. Mifflin-St Jeor BMR · beginner to advanced · free & instant.

How Many Carbohydrates Do You Need During Exercise? Calculate carbs needed per hour by duration and intensity. Reference table, gel and banana equivalents. Based on ACSM sports nutrition guidelines for runners, cyclists and endurance athletes.

Body Fat % Calculator by Skinfolds Jackson-Pollock 3-site skinfold calculator. Measure your calipers, get your % body fat and fitness category instantly.

Karvonen Heart Rate Zone Calculator (5 HRR Zones) Karvonen heart rate zone calculator: enter max HR and resting HR to get your 5 training zones in bpm using the Heart Rate Reserve (HRR) method. Free, instant.

Create Your Marathon Training Plan (42K) by Experience Level Personalized marathon training plan (42K) calculator by experience level. Free tool for beginners to advanced runners. Get your training schedule.

Muscle Recovery Time Calculator: How Long to Rest Between Workouts Find out exactly how many hours your muscles need to recover between sessions. Based on muscle group, intensity, age, and sleep — with a full reference table.

How Much Protein Per Meal for Muscle Growth? Find the optimal protein dose per meal to maximize muscle protein synthesis. Enter your weight and daily target — get your per-meal range backed by ISSN research. Free & instant.

Running Pace Calculator Calculate your running pace in min/km, min/mile, and speed (km/h, mph) from distance and time. With pace tables for 5K, 10K, half marathon, and marathon.

Padel Ranking Points Calculator — How Many to Advance Calculate exactly how many padel ranking points you need to move up a category in the AAP or APT system. Table from 7th to 1st category + minimum tournaments.

Competition Weight Calculator: Ideal Range by Sport and Height Find your ideal competition weight by sport, height, and sex. Based on sport-specific BMI ranges used by elite athletes — running, cycling, swimming, powerlifting, CrossFit, and more.

Rest Time Between Sets by Training Intensity Calculate optimal rest periods between sets based on intensity (% 1RM) and training goal. Free, fast, science-based.

One Rep Max (1RM) Calculator Estimate your 1RM without risk: enter weight and reps, get estimates from 3 validated formulas plus a percentage table for periodization.

Travel

Fuel costs, trip budgets, expense splitting, tips.

Split Travel Expenses Among Friends Split travel expenses: calculate what each person spent on a group trip and who owes whom. Up to 6 people. For trips, vacations, weekends, and more.

Construction

Bricks, cement, paint, flooring estimates.

Boiler kW per m² Calculator + Sizing Chart Find exactly how many kW your boiler needs per m². Enter your area and insulation quality — instant result with sizing chart for 50–300 m².

How Many Bricks Per Square Meter of Wall? How many bricks per square meter of wall? US modular: 75/m² · UK standard: 60/m². Enter area, brick type and waste % — instant total including mortar joints.

How Many Bags of Tile Adhesive Per Square Meter? Calculator How many bags of tile adhesive per square meter? Enter area, tile size and method — get the bag count instantly. Coverage: 8.3 m²/bag small tiles to 2.8 m²/bag XL.

Ceramic Tile Calculator — Boxes, Adhesive & Grout Calculate exactly how many tile boxes you need. Enter room dimensions + tile size → instant boxes, adhesive (kg) and grout (kg). Works for 30×30 to 100×100 ceramic and porcelain.

Ceramic Tile Box Calculator: Area + Waste → Boxes Enter your area (m²) and the coverage per box to find out exactly how many boxes of tile you need — with 10% waste already included. Instant result, no signup.

Concrete Beam Sizing Calculator (h & b from Span) Find the right concrete beam height and width for your span in seconds. Uses the L/12 depth rule (ACI 318-19) with a reference table for spans 3–12 m. Free, no sign-up.

Concrete Mix Ratio Calculator — Bags of Cement, Sand & Gravel per m³ How many bags of cement per cubic meter? M20 needs 7 bags (350 kg), 0.42 m³ sand, 0.66 m³ gravel. Instant results for M10–M30. ACI 211.1 mix table included.

Curtain Fabric Calculator — How Much Fabric Do You Need? (+ Reference Charts) Calculate exactly how much curtain fabric to buy per window. Window width × fullness multiplier + seam and hem allowances. Result in cm and linear meters — with fullness and heading reference tables.

Electrical Cable Size Calculator: Wire Gauge by Amperage and Distance Find the correct copper wire gauge (mm²) for any circuit based on current (amps), run length (m), and voltage. Applies IEC 60364 voltage-drop and ampacity criteria. Includes reference table.

Furniture Paint Coverage Calculator: How Many Cans You Need Calculate exactly how many cans of paint or varnish you need for furniture. Enter surface area, number of coats, and product coverage rate → instant result with reference table by finish type.

Garden Soil Calculator: How Much Soil Do I Need for My Raised Bed? Calculate exactly how much soil you need for your garden bed, raised bed, or planter. Enter length, width, and depth — get volume in m³, litres, and number of bags, with the 15% settling allowance included. Free, accurate, no sign-up.

How Much Grass Seed Per Square Meter? Rate by Species How much grass seed per square meter? Rates from 10 g/m² (bermuda) to 40 g/m² (ryegrass-fescue mix). Enter lawn area and species — grams/kg for new lawn or overseed.

How Much Paint Do I Need? Calculate Liters by m² and Coats Calculate exactly how many liters (or gallons) of paint you need. Enter area, number of coats, and coverage rate for an instant, accurate estimate.

Brick Perimeter Wall Calculator — Bricks, Mortar & Footing How many bricks do you need for a perimeter wall? Enter lot perimeter, height, and gate openings — get bricks (or CMU blocks), mortar bags, footing concrete, and pillar count instantly.

How Much Roof Waterproofing Do You Need? kg/m² Calculator Calculate exactly how many kg of liquid or membrane roof waterproofing you need. Enter your roof area and product type — get the total kg instantly. Coverage table included.

Rough Plaster Mortar Calculator: m³, Cement Bags & Sand Calculate exactly how much mortar, cement bags, and sand you need for rough plaster (scratch coat). Enter wall area and thickness — get m³, bag count, and sand volume instantly. Free, no sign-up.

How Many BTU Do I Need for My Split AC? Calculator by m² Enter your room size and climate zone and get the exact BTU your split AC needs, plus the frigorías equivalent. Formula: BTU = m² × climate factor (600–850 BTU/m²).

Water Pump Power Calculator (Watts & HP) Calculate water pump power in watts and HP from flow rate, head, and efficiency. Includes a pump sizing table for common applications — rooftop tanks, irrigation, wells. Free, no signup.

Cooking

Cups to grams, recipe scaling, cooking conversions.

Cake Servings by Pan Size Calculator Cake servings by pan size calculator: enter pan diameter or dimensions to see how many people your cake serves. Chart for round, square and sheet pans (Wilton).

Cups to Grams Converter (Baking) Convert any number of cups to grams for flour, sugar, butter, oil, milk, honey and 17+ baking ingredients. USDA and King Arthur densities. Free and instant.

Egg Size to Grams: White, Yolk & Edible Weight How many grams is a Large egg? White ≈ 33 g, yolk ≈ 18 g, edible ≈ 52 g. Full USDA size-to-grams chart (Small → Jumbo) + free calculator for baking and meal prep.

Homemade Chocolate Bonbons Calculator Calculate exactly how many grams of couverture chocolate you need for homemade bonbons. Enter piece count, weight per bonbon, filling %, and tempering waste — get instant result plus a reference table by mold type.

Beer IBU Calculator — Tinseth Formula Beer IBU calculator using the Tinseth formula: enter hop grams, alpha acids, boil time, volume and gravity to get bitterness in IBU. Free homebrew tool.

16/8 Intermittent Fasting Calculator — Find Your Eating Window Enter your last meal time and get your exact break-fast time and eating window. Supports 16/8, 18/6, and OMAD protocols. Free, instant, no signup.

Gas Mark to Celsius Converter — Oven Temperature Chart (°C, °F & Fan) Convert gas marks to Celsius and Fahrenheit instantly. Gas mark 4 = 180°C = 356°F. Full table: marks ¼ to 9, fan oven adjustment included. Free calculator.

How Many Drinks for a Party? Beer, Wine & Soda Calculator Enter guests and hours — get exact cases of beer, wine bottles, and soda 12-packs. Uses the caterer's 2+1/hour rule with a 15% safety buffer. Free and instant.

Sushi Per Person Calculate sushi portions: 10-12 pieces or 2-3 rolls per person. Free online tool with party and catering sizes. Calculate now.

How Much Rice Per Person? Grams Calculator How much rice per person in grams? 80 g raw per adult as a main, 60 g as a side. Calculator by group size and meal type, with cups and water ratios included.

Vanilla Pound Cake Recipe Scaler — get exact ingredient amounts for any serving size Scale your vanilla pound cake recipe to any number of servings instantly. Get exact grams for butter, sugar, flour, eggs, vanilla, baking powder, salt, and milk — plus an estimated bake time and a quick-reference scaling table.

Optimal Water Mineralization for Specialty Coffee Calculate water hardness and mineralization for specialty coffee. SCA standards: TDS 75-250 ppm, hardness 50-175 mg/L, pH 6.5-7.5. Optimize your brewing.

Pets

Dog/cat age, feeding, medication by weight.

Convert Your Cat's Age to Human Years Instantly convert your cat's age to human years using the official AAFP/AAHA 2021 formula. Get your cat's life stage and vet care recommendations. Free, no sign-up.

Dog & Cat Age in Human Years: Size-Adjusted Calculator Convert your dog or cat's age to human years using size-adjusted formulas — not the outdated ×7 rule. Small, medium, large, and giant breeds. Instant results.

Math

Average, Pythagoras, quadratic, factorial, GCD.

Annual Salary to Hourly Rate Calculator Convert any annual salary to hourly, daily, weekly, and monthly pay instantly. Includes a reference table for common salaries ($30k–$200k) and the exact formula used by the U.S. OPM.

Circle Area, Perimeter, and Sector Calculator Calculate circle area (π×r²), perimeter (2πr), sector area, and arc length instantly. Enter the radius — optionally add an angle for sector calculations. Includes formula, reference table, and worked examples.

Convert Between Binary, Decimal, and Hexadecimal Instantly convert between binary, decimal, and hexadecimal. Enter any number, pick your source and target base, get the result immediately. Includes a full reference table and step-by-step explanation.

Binomial Probability Calculator — P(X=k) Calculate exact binomial probability P(X=k) for n trials with probability p. Instant results with mean, variance, and a reference table for common values.

Cone Volume Calculator — V = (1/3)πr²h Calculate cone volume, slant height, and surface area instantly. Enter radius and height — get V = (1/3)πr²h, slant height l = √(r²+h²), and total surface area in one click. Free, no sign-up.

Celsius to Fahrenheit & Kelvin Converter Convert Celsius to Fahrenheit (and back) instantly. °F = °C × 1.8 + 32. Quick reference: 0°C = 32°F · 37°C = 98.6°F · 100°C = 212°F. Free, no signup.

Degrees to Radians Converter (+ Radians to Degrees & Gradians) Instantly convert degrees to radians, radians to degrees, and gradians. Includes a full reference table of common angles (30°, 45°, 60°, 90°, 180°, 360°) and exact conversion formulas used in math, physics, and programming.

Gallons to Liters Converter (US & UK gallon) 1 US gallon = 3.78541 L | 1 UK gallon = 4.54609 L. Convert gallons to liters instantly using the exact NIST factor. Includes quick-reference table and US vs UK gallon comparison.

Miles to Kilometers Converter (+ km to miles) Convert miles to kilometers instantly. 1 mile = 1.609344 km exactly (NIST). Works both ways. Includes reference table for common running, driving, and cycling distances.

Cylinder Volume Calculator (V = π·r²·h) Calculate cylinder volume instantly with V = π·r²·h. Enter radius and height to get volume in cm³, liters, and surface area. Reference table included.

Factorial Calculator (n!) with Reference Table Calculate n! instantly. Enter any non-negative integer and get the exact factorial value with a reference table from 0! to 20!, worked examples for permutations and combinations, and Stirling's approximation.

Factorial, Combinations, and Permutations Factorial calculator: compute n!, combinations C(n,r), and permutations P(n,r). Great for statistics, probability, combinatorics, and lottery. With BigInt.

Geometric Progression: nth Term & Partial Sum Free geometric progression calculator 2026: find nth term and partial sum instantly. Covers finance, physics, biology and CS uses. Calculate now.

Hours Between Two Times Calculator Calculate exact hours and minutes between any two clock times. Handles overnight shifts automatically, deducts break time, and shows results in decimal hours, HH:MM, and total minutes — free and instant.

Simple Interest Calculator (I = P × r × t) Calculate simple interest in seconds: enter principal, annual rate, and time (years, months, or days). Get total interest, final amount, and monthly/daily breakdowns. Includes worked example and simple vs. compound table.

Percentile Calculator — Find Where Any Value Ranks Enter your dataset and a value to instantly find its percentile rank, quartile, and Q1/Q2/Q3 thresholds. Works for exam scores, test results, health measurements, and any numeric data.

Pythagorean Theorem Calculator Calculate the hypotenuse or a leg of a right triangle using the Pythagorean theorem. Also get area, perimeter, and angles. With Pythagorean triples.

Polynomial Derivative Calculator (Power Rule) Instantly differentiate any polynomial using the Power Rule. Enter coefficients from highest to lowest degree — get the exact derivative expression, step-by-step logic, and a table of worked examples.

Unit Converter — Length, Weight, Volume & Temperature Instantly convert miles to km, kg to lb, °C to °F, gallons to liters and 20+ more units. Exact international factors — no rounding, no sign-up. Includes quick-reference tables.

Education

Grades, averages, credits, scholarships.

10,000-Hour Rule Calculator — How Long to Master a Skill? Enter your weekly practice hours and see exactly how many years to reach 10,000 hours — Gladwell's mastery threshold. With reference table for common schedules.

Hours to Master a Skill: 80/20 Learning Curve Calculator Enter your total target hours and weekly practice time to get the exact weeks to reach mastery. Uses the 80/20 Pareto principle and deliberate practice research by Ericsson.

How Many New Anki Cards Per Day? Calculator How many new Anki cards per day to finish your deck on time? Enter total cards and days available — get the daily pace plus estimated reviews and study time.

How Many Hours for Bilingual Kids? Find out how many hours your child needs for active bilingualism. Free calculator based on Pearson & De Houwer research.

Cornell Notes Study Time Calculator Find out exactly how long Cornell note-taking takes per chapter. Enter pages, chapters, and difficulty — get a breakdown of Record, Reduce, Recite, Reflect, and Review time.

Daily Duolingo study time by CEFR level Calculate how many Duolingo minutes per day you need: total study minutes for your CEFR goal ÷ days until your target date. Includes the A1–C2 hour table.

Ebbinghaus Forgetting Curve Calculate the Ebbinghaus forgetting curve exponent (t/S): enter days elapsed and memory stability to determine whether it's time to review — and estimate your current retention.

How many hours to study for an exam: pages ÷ pages per hour Estimate exam study hours: pages to cover ÷ your study speed in pages per hour. Includes a difficulty table to pick a realistic rate. Free calculator.

How many flashcard reviews per day to hit your goal Calculate daily flashcard reviews: total reviews needed ÷ days available. Plan your Anki or SRS workload with spaced repetition benchmarks.

Can You Learn Two Languages at Once? Viability Calculator Find out if learning two languages simultaneously is feasible with your daily schedule. Calculate effective study minutes per language after cross-linguistic interference — free & instant.

IELTS to TOEFL Score Conversion Calculator Convert IELTS to TOEFL iBT (or vice versa) and get your CEFR level instantly. Full concordance table with all bands — from IELTS 5.0 / TOEFL 35 up to IELTS 9.0 / TOEFL 120.

Reading Speed Calculator (Words Per Minute) Find out how fast you read in seconds. Enter words read + time, get your WPM instantly — plus a norms table by grade level and adult benchmarks from research.

UBA Medicine Entrance Calculator Calculate your UBA medicine entrance chances. Find out what CBC average you need to get into medicine at UBA.

Calculate Your Daily Anki Cards Calculate daily Anki cards based on your learning goal. Optimize spaced repetition with our free calculator.

What Grade Do I Need on My Final to Pass? Enter your passing minimum, total exams, grades already earned, and exams left — get the exact score you need in seconds. Works for any grading scale (0–10, 0–100, letters).

Book Reading Time Calculator (WPM → Hours & Minutes) Enter your reading speed (WPM) and total word count to instantly find how long any book will take. Includes average WPM table and word counts for 20+ popular books.

How long does it take to write a thesis? Enter your thesis word count and weekly writing pace to get your realistic timeline in weeks and months. Includes benchmark tables for Bachelor's, Master's, and PhD theses.

UBA XXI Final Grade Calculator (40% Coursework + 60% Exam) Calculate your official UBA XXI grade instantly: enter your coursework average and final exam score and get the weighted result (40/60). Includes passing/failing check and grade table.

Active vs. Passive Vocabulary Ratio Calculator Calculate your active-to-passive vocabulary ratio and check whether you're in the healthy 40–60% range. Includes full word-count tables by CEFR level: A1, A2, B1, B2, C1 and C2.

Automotive

Fuel consumption, insurance, registration fees.

Oil Change Interval Calculator by Oil Type and Km When is your next oil change due? Enter current km and oil type: conventional 5,000 km · semi-synthetic 7,500 · full synthetic 10,000 · long-life 20,000.

Calculate Annual Car CO2 Emissions Calculate annual CO2 emissions from your car based on fuel consumption. Free tool updated for 2026.

Compare Your Annual EV vs Gas Savings Compare annual EV vs gas costs for US drivers 2026. Calculate fuel savings, maintenance savings, and total cost of ownership. Note: the $7,500 federal EV tax credit ended Sept 30, 2025 — state rebates still vary by state.

Convert Speed Between km/h, mph, and Knots Convert km/h to mph, knots, and m/s instantly. Fast, free speed unit converter with real-time calculations.

Calculate Trip Fuel Cost Calculate fuel costs for any trip. Enter distance, fuel efficiency & price per liter. Instant results. Free, no sign-up required.

Technology

Storage, bandwidth, battery, FPS, cloud costs.

3D Print Time Calculator by Layer Height How long will your 3D print take? Enter model height, layer height, print speed, and layer area to get exact hours. Includes time tables for 0.1–0.3 mm layers and real speeds by printer model.

Streaming Bitrate Calculator — YouTube, Twitch & Kick Find the right bitrate for your stream in seconds. Enter your resolution and platform to get the exact Mbps recommendation and minimum upload speed needed — with a full reference table.

AWS EC2 On-Demand: Hourly-to-Monthly Cost Calculate AWS EC2 on-demand monthly costs. Free pricing calculator for all instance types with 2026 rates.

Code Complexity Calculator (KLOC) Estimate project complexity and effort using KLOC. Free calculator with COCOMO model. Fast sizing metrics for software development planning.

Docker Image Size Calculator (by base image + dependencies) Estimate your Docker image size: pick a base (Alpine, Debian slim, Ubuntu, distroless), add dependency MB, get the total — plus a base-image size table and how to shrink it.

File Download Time Calculator + Reference Table Find out exactly how long any file takes to download. Enter file size (MB/GB/TB) and internet speed (Mbps/Gbps) — instant result. Includes a full table for common file sizes at 25, 100, 500 Mbps and 1 Gbps.

FPS to ms Frame Latency Calculator (+ Smoothness Table) Convert FPS to frame latency in milliseconds: 60 FPS = 16.67 ms, 144 FPS = 6.94 ms, 240 FPS = 4.17 ms. Free calculator + full FPS-to-ms reference table and smoothness tiers.

Gaming PC Budget Calculator by FPS Target Find out how much to spend on a gaming PC in 2026. Get GPU and CPU recommendations matched to your target FPS — 60, 144, or 240 FPS — at 1080p, 1440p, or 4K.

Git Repo Size Calculator Estimate your Git repository size from commits, files, and average file size. See the working tree, the .git/ store, the total in MB, and a reference table.

GPU Rental Cost Calculator Compare GPU cloud rental vs ownership 2026: RTX 4090, A100, H100 rates on Vast.ai, RunPod & Lambda. Find your break-even month. Free online.

Appliance Electricity Cost Calculator — kWh & Monthly Bill Enter any appliance's watts, daily hours, and your rate to get exact kWh/month and dollar cost. Includes a reference table for 10 common household devices.

OpenAI API Monthly Cost Calculator: GPT-4o, mini & o3 Estimate your monthly OpenAI API bill instantly. Enter model, tokens per request, and daily volume — see cost per day, Batch API 50% savings, and side-by-side comparison with Claude and Gemini.

PC Power Consumption Calculator Calculate total watts and recommended PSU for your gaming PC. CPU + GPU + components with 30% headroom. Free, instant. Calculate now.

RPM to RPS Converter (API Rate Limit Calculator) Convert RPM to RPS instantly (and RPH/RPD). RPS = RPM ÷ 60. Free API rate-limit calculator with a quick reference table and real provider limits.

SLA Uptime & Downtime Calculator How much downtime does 99.9% or 99.999% uptime allow? Convert any SLA % into minutes per year, month, week and day — with a full nines reference table.

DNS TTL Calculator — How Long Until Your DNS Change Propagates Enter your TTL in seconds and instantly see how long DNS propagation takes, whether your value is safe, and what to do before a migration. Includes a full reference table.

Video File Size Calculator: How Big Is Your Video? Calculate exactly how many GB a video takes from its bitrate and length. Free, instant, no sign-up — plus a quick-reference table for 1080p, 4K, ProRes and CCTV.

Environment

Carbon footprint, recycling, water, solar energy.

Email Carbon Footprint Calculator: CO₂ by Email Type Find out exactly how much CO₂ your emails produce. A plain email = 4 g CO₂; one with an attachment = 50 g. Calculate your daily and annual digital footprint instantly.

Electronics

Ohm's law, resistors, kWh consumption, circuits.

Servo PWM Pulse Width to Angle Calculator Convert any servo PWM pulse width (ms or µs) to exact rotation angle. Standard RC: 1 ms = 0°, 1.5 ms = 90°, 2 ms = 180°. Includes reference table for 90°, 180°, and 270° servos.