Finance & Tax

Loan & mortgage repayment calculator

Choose how to repay a loan or mortgage and compare the monthly burden. Equal monthly payments keep the total steady; equal principal payments decline at a positive rate; interest-only payments leave the principal for maturity. Inspect principal, interest and remaining debt for every month.

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Result

A QUICK GUIDE

How to use

Choose Equal monthly payments, Equal principal payments, or Interest monthly with principal at maturity. The summary separates first-month principal and interest. Review the monthly repayment table in groups of 12 and download every row as CSV.
Enter the borrowed principal, nominal annual interest rate (%) and a whole number of years. For a mortgage, subtract the down payment from the property price first.
Monthly rate r = annual percentage / 1200; n = years × 12. Equal payment M = P × r / (1 − (1+r)^(-n)), or P/n at zero rate. Equal principal repays P/n plus opening balance × r each month. Interest-only pays P × r monthly and adds all P to the final payment.
Total repayment is the sum of monthly payments; total interest is the sum of monthly interest. Each payment equals its principal and interest portions. Figures display two decimals, but calculations use unrounded values; displayed rows and lender rounding may differ.
Principal must be positive and at most 1,000,000,000,000,000; rate 0–1,000%; term 1–100 whole years. Every monetary value uses the currency you entered; there is no currency conversion.
Model reviewed 2026-10-21. Jurisdiction-neutral fixed-rate monthly, end-of-month payments. Excludes fees, points, insurance, taxes, regulatory APR, daily accrual, variable rates, grace periods and early repayment. Principal: positive up to 10^15; rate: 0–1000%; term: 1–100 whole years. A lender quote can differ.

Monthly repayment schedule

Amounts display two decimals. Calculations use unrounded values, so displayed rows may not add up exactly. Download all rows as CSV.

Payment, principal, interest and remaining balance by month
Month	Payment	Principal	Interest	Balance

Download full CSV

Worked examples

Principal 12,000; rate 0%; term 1 year

Monthly payment 1,000.00

Twelve equal payments repay the principal without interest.

Principal 100,000; rate 6%; term 30 years

Monthly payment 599.55

The monthly rate is 0.5% for 360 payments. The displayed payment is rounded, while total interest uses the unrounded amount.

12,000 principal; 12%; 1 year; equal principal

First 1,120.00 · Last 1,010.00

Repay 1,000 of principal each month. Monthly interest decreases from 120 to 10. Total interest is 780.

Questions & answers

Is nominal interest the same as APR?

Not necessarily. APR may include lender fees and other charges under local rules. This model uses only the nominal interest rate and does not calculate regulatory APR.

Which repayment method has the smallest payment?

At a positive rate, equal-principal payments start higher and decline; equal monthly payments stay steady. Interest-only starts with just interest but leaves all principal due at maturity. Compare total interest and the final payment too.

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