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Amortization Calculator | Create Full Loan Payment Schedule

Last updated: June 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

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Quick reference

Principal vs interest on a $200,000, 30-yr loan at 6.5%:

Year	Interest paid	Principal paid	Balance
1	$12,902	$2,272	$197,728
10	$11,148	$4,026	$170,558
20	$7,789	$7,385	$112,019
30	$526	$14,646	$0

savings Plan with confidence

Finance decisions get a lot easier when you can see the full picture. Enter your numbers above to see total payments, interest paid, and the long-term cost of every choice — so you can compare options side by side before signing anything.

percent How the math works

We use the standard amortization, compound-interest and present-value formulas published by the Consumer Financial Protection Bureau and the Federal Reserve. The methodology block below shows every variable and rounding step we apply, so the answer is never a black box.

shield_lock Your data stays private

Every calculation happens in your browser with JavaScript — your income, balances, and loan numbers are never sent to our servers, logged, or shared. Close the tab and the inputs vanish. No sign-up, no tracking pixels on the form, no spreadsheet emailed to you later.

lightbulb Pro tip

Save the URL after you calculate — your inputs aren't stored, so write down the headline number plus the breakdown. Then come back and edit one variable at a time (down payment, rate, term) to see exactly which lever moves your monthly figure the most. That's where the real planning happens.

Interpretation guide

Reading your amortization schedule:

Column	What it tells you
Interest	Falls every month as the balance drops
Principal	Rises every month, accelerating payoff
Balance	Remaining amount owed after each payment
Extra payment	Applied to principal, skips future interest

lightbulb Worked example

Let's say you are using the Amortization Calculator. Generates a full loan amortization schedule. Enter the loan amount, interest rate, and term, and the tool calculates the fixed monthly payment and breaks down every payment into principal and Enter the values that match your situation into the input fields and press calculate — using realistic numbers makes the result directly useful for you.

Result: The calculator instantly applies the formula Interest_month = Balance x (APR/12); Principal_month = Payment - Interest_month and returns the result with appropriate precision.

What this means: Read the result in the context of what you are measuring. The step-by-step breakdown lets you confirm the math and understand which input most affects the outcome.

Formula & methodology

Formula: Interest_month = Balance x (APR/12); Principal_month = Payment - Interest_month

The Amortization Calculator is built on a well-established calculation method. It uses the formula Interest_month = Balance x (APR/12); Principal_month = Payment - Interest_month to turn your inputs into a reliable result. Generates a full loan amortization schedule. Enter the loan amount, interest rate, and term, and the tool calculates the fixed monthly payment and breaks down every payment into principal and interest, showing the The steps are shown on the page so you can follow the reasoning from input to output.

Amortization splits a level payment into interest (the balance times the monthly rate) and principal (the rest). Because the balance shrinks each month, interest falls and principal rises, so the loan pays off faster toward the end. The schedule lists every payment with its split and running balance, and extra payments reduce the balance directly to cut total interest and shorten the term.

What is the Amortization Calculator?

The Amortization Calculator is a free, browser-based finance calculator tool that helps you Generates a full loan amortization schedule. Enter the loan amount, interest rate, and term, and the tool calculates the fixed monthly payment and breaks down e. Instead of working through the math by hand or in a spreadsheet, you enter your values and the calculator returns an accurate result instantly — while still showing the formula and the steps so you can verify the reasoning. It is designed for quick everyday use: no sign-up, no installation, and everything runs locally in your browser for complete privacy.

How to use the Amortization Calculator

Enter the required values into the input fields.
Press the calculate button — the result appears immediately, updated live as you change any value.
Read the step-by-step breakdown below the result to see exactly how the calculation was performed.
Use the interpretation guide to understand what the result means for your situation, and try different inputs to see how they change the outcome.

How to use the Amortization Calculator

Enter the loan amount, the annual interest rate, and the term, and the tool generates the complete amortization schedule. Each row applies Interest_month = Balance × (APR ÷ 12), then Principal_month = Payment − Interest_month, so the balance declines by exactly the principal portion each month. The result shows the monthly payment, the full payment-by-payment schedule, the running balance, and the total interest paid over the life of the loan.

Interpreting your result

The schedule reveals the true structure of every fixed-rate loan: in month one, nearly all of the payment is interest, and only a sliver reduces the principal; by the final months the split is reversed. This is why paying extra principal early is so powerful — every extra dollar in the early years skips the interest that dollar would have carried for the remaining term. The total-interest column is the honest cost of the loan, and comparing schedules across terms and rates shows exactly what a lower rate or shorter term is worth. The remaining-balance column is also what you need for refinancing decisions.

Common mistakes to avoid

The most common error is thinking the interest share stays constant — it shrinks every month as the balance falls. Second, ignoring the payment date: interest accrues daily on most loans, so a payment a week late shifts the split. Third, rounding the payment in the schedule, which leaves a small balance at the end — lenders adjust the final payment instead. Finally, treating the APR as the effective cost when fees and points are included — the schedule uses the actual rate you pay on the balance.

Tips for best results

Use the schedule to plan extra payments: even one extra payment per year early in the term cuts months or years off the loan. Compare the total interest of different terms side by side before committing. When refinancing, check the remaining balance and the new schedule to confirm the savings justify the closing costs. Look at the interest split in month one to understand what the first year really costs. Keep the payment amount constant after rates drop — paying the old amount on the new loan pays it off faster.

Authoritative source: Consumer Financial Protection Bureau

Frequently asked questions

What is an amortization schedule?

The Amortization Calculator is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. Generates a full loan amortization schedule. Enter the loan amount, interest rate, and term, and the tool calculates the fixed monthly payment and breaks down every payment into principal and interest, showing the remaining balance over the life of the loan There is no limit on usage, and it works on any device.

Why is most of my early payment interest?

Because interest is charged on the full outstanding balance, which is largest at the start of the loan: Interest_month = Balance × (APR ÷ 12) is highest in month one and shrinks as the principal is paid down. The payment stays fixed, so the principal portion grows each month. On a 30-year mortgage, roughly two-thirds of the first year's payments go to interest.

How do extra payments change the schedule?

Enter the required values into the input fields and press the calculate button. The tool applies the formula Interest_month = Balance x (APR/12); Principal_month = Payment - Interest_month and returns the result with a short explanation of each step, so you can check the working yourself.

Does amortization apply to mortgages and car loans?

Yes — the Amortization Calculator is fully responsive and works in any modern browser on a phone, tablet, or desktop, with touch-sized inputs and no app to install. The full calculation runs on the device, so you get the same speed and precision on mobile as on a computer, even with a weak connection.

How much total interest will I pay?

The total interest is the sum of every month's interest charge over the full term — the calculator shows it as a separate line. On a $250,000 mortgage at 6.5% over 30 years, total interest exceeds $318,000, roughly 1.3× the principal. Shortening the term to 15 years at the same rate cuts the interest by more than half. Always compare total interest when choosing a loan.

What does the Amortization Calculator do?

Generates a full loan amortization schedule. Enter the loan amount, interest rate, and term, and the tool calculates the fixed monthly payment and breaks down every payment into principal and interest, showing the remaining balance over the life of the loan. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.

What formula does the Amortization Calculator use?

Each payment is split into interest and principal: Interest_month = Balance × (APR ÷ 12), then Principal_month = Payment − Interest_month. The balance shrinks each month, so the interest portion declines and the principal portion grows over the term. The calculator shows the full schedule month by month, including the total interest paid over the life of the loan.

Is the Amortization Calculator free and private?

Yes — the Amortization Calculator. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.

How accurate is the Amortization Calculator?

The Amortization Calculator applies the standard formula: Interest_month = Balance x (APR/12); Principal_month = Payment - Interest_month. It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.

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