Finance

Loan Payment Calculator

Q: What is better: a shorter or longer loan term?

**Always the shortest you can comfortably afford**. A $250,000 loan at 6.5% for 15 years costs about $61% in interest; for 30 years it's about 128%. The monthly payment is higher with a shorter term, but you pay far less total. If the payment doesn't fit your budget, reduce the loan amount rather than extend the term.

Q: How is a monthly loan payment calculated?

The amortization formula: **P × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1)**, where r is the monthly rate. A $20,000 loan at 9% APR over 5 years: $415/month, $4,910 total interest.

Q: What is APR and why is it so important?

The **Annual Percentage Rate (APR)** is the true cost of the loan, including the interest rate + origination fees + mandatory insurance + any other costs. It's the only metric you should compare between lenders. Two loans with the same nominal rate can have very different APRs.

Q: Does this payment include insurance?

**No**, this calculation covers only principal + interest using the standard amortization formula. Lenders often add **life insurance** (mandatory in many mortgages) and **property insurance**, which can significantly increase the actual payment.

Q: What is the difference between fixed and variable rate?

A **fixed rate** stays the same for the entire loan term — your payment never changes. A **variable rate** adjusts periodically (usually annually) based on a benchmark rate. Variable rates usually start lower but can increase significantly. For long-term loans (mortgages), fixed rates provide certainty; for short-term loans, variable can save money.

Q: How much house can I afford?

A common guideline is the **28/36 rule**: your mortgage payment should not exceed **28% of your gross monthly income**, and your total debt payments should not exceed **36%**. Use this calculator to find the loan amount that produces a payment within those bounds.

Q: What happens if I miss a payment?

The lender charges **late fees** on the overdue amount. After 30 days, you're in **default** and it gets reported to credit bureaus, damaging your credit score. After 90+ days, the lender may initiate collection or foreclosure proceedings. Always communicate with your lender before missing a payment — many offer hardship programs.

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

Data verified · July 2026
Edited by Martín Rodríguez
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Edited by: Martín Rodríguez (editorial policy )

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Jul 2, 2026 — Shortened the summary and moved the payment formula upfront.

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Standard amortization is how virtually every US mortgage, auto loan, and personal loan is structured: a fixed monthly payment in US dollars for the full term, where early payments are mostly interest and later payments are mostly principal. This calculator applies the standard amortization formula and returns your monthly payment ($), total amount paid, total interest, and an estimated Annual Percentage Rate (APR) — the single number the Consumer Financial Protection Bureau (CFPB) and federal Truth in Lending Act require lenders to disclose. Use it to compare mortgage offers, auto financing, and Fed-tracked personal loan rates before signing.

When to use this calculator

You're about to take a personal loan and want to know the monthly payment.
You're comparing offers from different banks and want to see which is cheaper.
You're offered 'zero-interest' installments and want to verify there's no markup.
You already have a loan and want to calculate the remaining balance if you prepay.
You're evaluating a mortgage and want to simulate payments.

Monthly payment by loan amount and term (at 7% APR)

Standard amortization at a fixed 7% APR. Your rate changes the numbers, but the shape holds: shorter terms = higher payment, far less total interest.

Loan amount	3 years	5 years	7 years
$10,000	$309	$198	$151
$20,000	$618	$396	$302
$30,000	$926	$594	$453
$50,000	$1,544	$990	$755

How it works

What Is Standard (French) Amortization?

The French amortization system is the most common loan repayment method worldwide. Its distinctive feature is a fixed payment throughout the entire term, making budgeting easy.

What changes month to month is the internal composition:

At the beginning: ~80-90% interest + ~10-20% principal

At the midpoint: ~50% interest + ~50% principal

At the end: ~10-20% interest + ~80-90% principal

The Formula

payment = principal x (i x (1+i)^n) / ((1+i)^n - 1)

Where:

principal = amount borrowed

i = monthly rate (annual rate / 12)

n = number of payments

How Interest Compounds Over Term Length

Term	Total Interest (at 6.5% annual)
60 months (5 years)	~17% of principal
120 months (10 years)	~37% of principal
180 months (15 years)	~61% of principal
240 months (20 years)	~88% of principal
360 months (30 years)	~128% of principal

> Takeaway: the longer the term, exponentially more interest. If you can afford a higher payment, choose a shorter term.

Interest Rate vs APR — The Key Difference

Concept	What It Is	What It's For
Nominal Rate	Base rate without compounding	What banks advertise
Effective Annual Rate	Rate with monthly compounding	True cost of money
APR (Annual Percentage Rate)	Effective rate + fees + insurance	True cost of the loan

Always compare by APR, never by the nominal rate alone. A loan at 5.5% nominal can have a higher APR than one at 6% if the first has high origination fees.

Alternative Amortization Methods

System	Payment	Principal Repaid	Total Interest
French (Standard)	Fixed	Increasing	Higher
German (Constant Principal)	Decreasing	Fixed	Lower
Interest-Only	Interest only + balloon	None until end	Highest

Tips for Borrowers

1. Compare APR, not just the rate: two lenders with the same rate can have very different APRs.
2. Choose the shortest term you can afford: you'll pay dramatically less interest.
3. Read the fine print on insurance: mandatory life insurance or payment protection can add 1-3% to your effective cost.
4. Consider prepayment: paying extra toward principal early saves enormous future interest.
5. Fixed vs variable: fixed rates give certainty; variable rates can save money but carry risk.

Prepayment Benefits

Paying an extra $100/month on a $250,000, 30-year mortgage at 6.5%:

Saves approximately $64,000 in interest

Pays off the loan 6 years early

The earlier you start prepaying, the more you save

Common Mistakes

1. Only comparing monthly payments: a lower payment with a longer term means much more total interest.
2. Ignoring compounding: the difference between 5% and 6% annual rate may seem small, but over 30 years it's tens of thousands.
3. Not reading insurance costs: some lenders bundle expensive insurance that doubles the effective rate.
4. Taking the longest term so the payment fits your budget: if the payment doesn't fit, borrow less.
5. Not prepaying when possible: extra payments at the start save the most due to how amortization works.

Example: $250,000 mortgage at 6.5% for 30 years

Principal: $250,000.

Annual rate: 6.5% → Monthly rate: 6.5 / 12 = 0.542%.

Term: 360 months (30 years).

Formula: 250,000 x (0.00542 x 1.00542^360) / (1.00542^360 - 1).

Monthly payment: ≈ $1,580.

Total paid: 1,580 x 360 = $568,861.

Total interest: 568,861 - 250,000 = $318,861.

You pay $1,580 USD/month for 30 years. Total repaid: $568,861 on a $250,000 loan — interest exceeds the principal. A 15-year term would drop total interest to roughly $152,000.

Disclaimer: Informational estimate. Actual rates, fees, and terms depend on the provider and contract; compare official documents before deciding.

Frequently asked questions

What is better: a shorter or longer loan term?

Always the shortest you can comfortably afford. A $250,000 loan at 6.5% for 15 years costs about $61% in interest; for 30 years it's about 128%. The monthly payment is higher with a shorter term, but you pay far less total. If the payment doesn't fit your budget, reduce the loan amount rather than extend the term.

How is a monthly loan payment calculated?

The amortization formula: P × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1), where r is the monthly rate. A $20,000 loan at 9% APR over 5 years: $415/month, $4,910 total interest.

What is APR and why is it so important?

The Annual Percentage Rate (APR) is the true cost of the loan, including the interest rate + origination fees + mandatory insurance + any other costs. It's the only metric you should compare between lenders. Two loans with the same nominal rate can have very different APRs.

Can I prepay my loan early?

In most countries, yes. Some lenders charge a prepayment penalty (typically 1-3% of the prepaid amount), while others allow it freely. Prepaying early saves the most interest because early payments are mostly interest. Always ask about prepayment terms before signing.

Does this payment include insurance?

No, this calculation covers only principal + interest using the standard amortization formula. Lenders often add life insurance (mandatory in many mortgages) and property insurance, which can significantly increase the actual payment.

What is the difference between fixed and variable rate?

A fixed rate stays the same for the entire loan term — your payment never changes. A variable rate adjusts periodically (usually annually) based on a benchmark rate. Variable rates usually start lower but can increase significantly. For long-term loans (mortgages), fixed rates provide certainty; for short-term loans, variable can save money.

How much house can I afford?

A common guideline is the 28/36 rule: your mortgage payment should not exceed 28% of your gross monthly income, and your total debt payments should not exceed 36%. Use this calculator to find the loan amount that produces a payment within those bounds.

What happens if I miss a payment?

The lender charges late fees on the overdue amount. After 30 days, you're in default and it gets reported to credit bureaus, damaging your credit score. After 90+ days, the lender may initiate collection or foreclosure proceedings. Always communicate with your lender before missing a payment — many offer hardship programs.

Sources & references

Update history

Log of data, formula and content changes for this calculator.

Jul 02, 2026Shortened the summary and moved the payment formula upfront.

Methodology & trust

Editorial

Finance calculator with its formula verified automatically against CFPB — Loan Estimate Explainer, per our editorial policy and methodology.

Updates

Updated: July 2026. Parameters are verified periodically against the cited sources.

Privacy

Calculations run 100% in your browser. We do not store or transmit your data.

Limitations

Indicative results. For critical decisions, consult a professional.

📌 How to cite this calculator

Rodríguez, M. (2026). Loan Payment Calculator. Hacé Cuentas. https://hacecuentas.com/en/loan-payment-calculator

Content licensed under CC-BY 4.0 — reuse it citing the source with a link to Hacé Cuentas.

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