Core calculator

Debt Payoff Calculator

Estimate when a debt can be paid off and how much interest extra payments can save.

Common questions

About this calculator

Does this support avalanche or snowball?

This page models one debt. For multiple debts, use this result for each account and prioritize either highest APR first or smallest balance first.

Why does extra payment save so much interest?

Extra principal payments lower the balance earlier, so future interest is charged on a smaller amount.

The calculator amortizes the balance month by month using the APR converted to a monthly rate.

Extra payments are added to the minimum payment before interest savings are estimated.

If the payment does not cover monthly interest, the debt cannot be paid down under that plan.

Educational planning estimate. It does not replace an official calculation or individualized financial, tax, or legal advice.

Estimate monthly loan payments, total interest, and the payoff impact of extra payments.

Estimate a mortgage payment for a Portugal property purchase, including down payment and monthly ownership costs.

Add assets and liabilities to estimate your current net worth in one clean number.