Tiny Toolkit

Loan Payment Calculator — Monthly Payment & Amortization

Enter your loan amount, interest rate, and term to instantly see your monthly payment, total interest paid, and the full amortization schedule breaking down every payment. Works for personal loans, auto loans, and any other fixed-rate installment debt. Everything runs in your browser — no data is sent anywhere.

All processing happens in your browser. No data is sent to any server.

Frequently Asked Questions

What formula does the loan calculator use?
It uses the standard amortization formula: M = P × [r(1+r)^n] / [(1+r)^n − 1], where P is the principal, r is the monthly interest rate (annual rate ÷ 12), and n is the number of monthly payments.
What does the amortization schedule show?
Each row shows the month number, total payment, the portion applied to principal, the interest charged, and the remaining balance. Early payments are mostly interest; later payments are mostly principal.
Does this apply to car loans and personal loans as well?
Yes. The formula is the same for any fixed-rate installment loan, including personal loans, auto loans, student loans, and mortgages. Just enter the correct rate, amount, and term.

Related Tools

Mortgage Calculator — Monthly Payment & Amortization Schedule

Estimate your monthly mortgage payment with principal and interest breakdown. Includes a full amortization schedule for any loan amount, rate, and term. Free.

Mortgage Overpayment Calculator — Save Interest & Pay Off Early

See exactly how much interest you save and how many years you cut off your mortgage by making extra monthly payments. Compare your current vs. accelerated payoff. Free.

Compound Interest Calculator — Investment Growth Over Time

Calculate how any investment grows over time with compound interest and regular contributions. See year-by-year growth, total contributions, and total interest earned. Free.