Free tools for real-life decisions

Don't just calculate. Know what to do next.

Accurate, private calculators for money, work, home, family, travel and business — organized around the decision you're actually trying to make.

✓ 239 calculators✓ Updated for 2026✓ No signup✓ Your data stays on your device
Six decision hubs

One place for the whole decision.

Each hub combines the calculators, comparisons and next steps that belong together.

Inside the hub

My Money: from stress to a clear plan.

MY MONEY · DECISION HUB

See the full picture first.

Start with income, fixed costs, debt payments and savings. Then choose the next move based on your real monthly margin.

Popular calculators

Fast answers when one number is enough.

↗

Compound Interest

Project a balance with monthly contributions.

↓

Credit Card Payoff

See your debt-free date and total interest.

♥

BMI & Healthy Range

Get your BMI and a weight range in seconds.

▦

Days Between Dates

Calendar days, weekdays and exact duration.

⌂

Mortgage Payment

Principal, interest, tax and insurance.

%

Margin & Markup

Price products without confusing both metrics.

●

Daily Calories

Maintenance, deficit and surplus targets.

$

Tip & Bill Split

Tip, total and amount per person.

No calculator matches that search.
Why trust the result

Clear inputs. Open formulas. Honest limits.

239free calculators in English
100%browser-based private calculations
2026current tax and reference data
0accounts required to calculate

Every result explains itself

We show the formula, assumptions, units, source date and the cases where a professional or an official source should take over.

Primary sources firstIRS · WHO · government data
Calculation methodVisible and reproducible

Made for decisions, not pageviews

Decision hubs bring related tools together so you can compare scenarios and understand the next step without opening five disconnected tabs.

Hub structureProblem → options → action
Your dataStays in the browser

Practical family and pet planning

Baby and child milestones Sleep, teeth, screen time, growth and age-based milestones. Dog lifestyle and costs Walking, shedding, apartment fit and first-year ownership costs.

How to choose the right calculator

Start with the decision you need to make: income and taxes, borrowing and investing, health, home, travel, or everyday math. Each tool states its assumptions, formula, worked example, and update date so you can check the result.

Subclusters

Guides and official sources

Start with the decision

What do you need to work out today?

Choose a topic and go straight to a focused calculator with clear assumptions and examples.

MoneyDebt, saving and investing.HealthBody, nutrition and pregnancy.MathPercentages, statistics and geometry.

Transparencia editorial

Quién responde por esta guía

Estado editorial visible en metodología
Autor y editor responsableFundador y editor responsable de Hacé Cuentas.
Cómo se verificaLa autoría y el método están explicados en las páginas editoriales.
Fuentes y métodoLa página explica sus supuestos y límites.Ver metodología →
Política editorialReportar una correcciónContacto editorial

Choose your situation

Main query:Free calculators for money, health, home and everyday decisions

What do you want to solve?

What do you need to calculate?Where do I stand in the standings?Do you want to compare options?What’s my GPA and what do I need to keep the scholarship?What should you do next?What is the fastest, cheapest way to clear my debt?

Original research

This collection’s coverage, by the numbers

These figures aggregate the decisions, variables and sources in the included hubs. The analysis is rebuilt from Hacé Cuentas’ official inventory.

coverage percentile
P100

15comparable collections

included hubs and routes
76
modelled variables
712
declared sources
463
publishers or agencies
239
Suggested citation
Hacé Cuentas’ “Don't just calculate. Know what to do next.” collection brings together 76 hubs and routes, 712 modelled variables and 463 declared sources.