Calculator

Loan payment calculator.

Enter a loan amount, APR, and term. The calculator returns your fixed monthly payment, the total interest you'll pay over the loan, and the total amount you'll repay. All math runs locally in your browser; nothing is sent anywhere.

How the math works

Fixed-rate installment loans (personal loans, auto loans, most mortgages) use a standard amortisation formula to determine the fixed monthly payment:

M = P × r × (1 + r)^n
        ─────────────
        (1 + r)^n − 1

M = monthly payment
P = principal (loan amount)
r = monthly interest rate (APR ÷ 12 ÷ 100)
n = number of monthly payments (loan term in months)

Total interest is simply (M × n) − P. This calculator doesn't include origination fees; a lender's true effective APR will be higher than the stated rate once fees are rolled in. Use the APR calculator to model fees.

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