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Loan payment calculator

A loan calculator turns your loan amount, interest rate and term into a monthly payment, total interest and a full amortization schedule. Add an optional extra payment to see how much faster — and cheaper — the loan is paid off. Works for personal, home-improvement and most fixed-rate installment loans.

The amount you’ll borrow.

Annual percentage rate.

Added to every payment to retire the loan faster.

Monthly payment

$501.09

Total interest$3,039
Total of payments$18,039
Payoff time3 yr
Payoff dateJun 2029
Principal $15,000 Interest $3,039
Balance over time until paid off

How this estimate is calculated

We use the standard amortizing-loan (PMT) formula to find the level monthly payment that retires your balance over the term at your APR. Each month, interest is the balance times the monthly rate (APR ÷ 12), and the rest of the payment reduces principal. Any extra payment is applied straight to principal, so the loan ends early and the schedule shows the real payoff month.

See our full methodology for assumptions, limits and the 2026 data used.

Sources

Written by
Colson Founder & consumer-finance researcher, ColsonSuperApps LLC
Verified
Every figure checked against its cited primary source
Last updated
June 14, 2026

These results are educational estimates based on the figures you enter and standard financial math, not financial advice or an offer of credit. Your actual rate, payment and terms depend on your credit, lender and other factors. Verify any number with the lender before you act.

Frequently asked questions

How is my monthly loan payment calculated?

It’s the fixed payment that exactly pays off the loan over the term. Early payments are mostly interest; later payments are mostly principal. The total stays level, which is why an early extra payment saves the most interest.

What does the amortization schedule show?

Month by month, how each payment splits between interest and principal and what balance remains. It makes clear how little principal you pay in the early years of a long loan — and why extra payments early on pay off.