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Fixed-payment simulation

Credit card payoff calculator

Estimate how long a balance may take to repay when the APR and monthly payment stay constant.

Browser-local estimate

Test a fixed monthly payment

The simulation adds estimated monthly interest, applies the payment, and repeats for up to 600 months.

Use an amount you expect to pay consistently.

Estimated payoff time

Estimated interest

Estimated total paid

Final payment

Simulation order

Interest, payment, new balance—month by month.

  1. Estimate monthly interest from the current balance.
  2. Add interest to the amount due.
  3. Apply the fixed payment.
  4. Repeat until the balance reaches zero or 600 months.
Safety condition

If the payment does not exceed the first month's estimated interest, the tool reports that the payment cannot reduce principal in this model.

Assumptions

The estimate assumes no new purchases, balance transfers, cash advances, fees, rate changes, missed payments, or payment changes. Interest is estimated monthly rather than from daily balances.

Why the final payment may be smaller

The last payment is capped at the remaining balance plus that month's estimated interest, so the tool never displays a negative or artificially full final payment.