Enter a balance, interest rate, and fixed monthly payment to calculate how long it takes to pay off the balance.
How to Use the Repayment Calculator
This tool skips the term field most loan calculators ask for. Enter the current balance, the annual rate, and the fixed payment you're actually making (or planning to make), and it works out how many months — and years — that payment takes to bring the balance to zero.
Every other loan calculator on this site starts from a term and solves for the payment. This one runs the opposite direction: pick a payment first, because that's the number your budget actually cares about, and let the payoff timeline fall out of the math.
Months to Pay Off = −ln(1 − rB ÷ M) ÷ ln(1 + r)B is the balance, r the monthly interest rate (annual rate ÷ 12), and M the fixed payment. There's a hard floor built into this formula: if the payment doesn't even cover the interest accruing each month, the balance never shrinks no matter how long you wait — it grows. The calculator flags this directly, naming the minimum payment that would actually make progress, rather than returning a nonsensical result.
Total Interest and Total Paid come from that same payoff timeline, rounded up to a whole final month — real payments don't come in fractional-month sizes, so the last one covers whatever's left even if it's smaller than the regular payment.
Card issuers and personal-loan services run this exact calculation constantly, quietly, in the fine print of a statement. This puts the same math in your hands instead.