Credit Card Debt Payoff Calculator

Q: Why does my balance barely go down each month?

On a high-APR card, most of a minimum payment goes to interest. At 22% APR a $6,000 balance accrues about $110 of interest in the first month, so a $150 payment only reduces the principal by about $40. Paying more than the minimum is what breaks the cycle.

Q: Should I use the debt avalanche or debt snowball method?

With multiple debts, the avalanche method (pay extra toward the highest APR first) minimizes total interest. The snowball method (pay off the smallest balance first) costs slightly more but delivers quick wins that help some people stay motivated. Both beat paying only minimums.

Q: Will a 0% balance transfer card help?

A 0% introductory APR balance transfer can pause interest for 12-21 months, so nearly every dollar goes to principal. Watch for a transfer fee of 3-5% and make sure you can clear the balance before the promotional rate ends and the standard APR applies.



Adjust the inputs above to see the breakdown.

What is the Debt Payoff Calculator?

The Debt Payoff Calculator tells you how many months it will take to clear a credit-card or loan balance at a fixed monthly payment, and how much of that total is interest versus principal.

How to Use This Calculator

Enter your current balance and the card's APR (shown on your statement).
Enter the fixed monthly payment you plan to make every month.
Optionally add an extra monthly payment to compare an accelerated plan.
Read the results. You get the payoff time in months and years, the total interest you will pay, the total amount repaid, and — if you added an extra payment — how much interest and time that extra money saves. The chart shows both payoff curves side by side.

If your payment is too small to cover the monthly interest, the calculator warns you: the balance would grow forever.

How does the underlying math work?

The number of months to pay off a fixed-rate balance with a fixed payment is:

n = − ln( 1 − (i × B) ÷ P ) ÷ ln( 1 + i )

B — starting balance
P — fixed monthly payment
i — monthly interest rate = APR ÷ 12

The result only exists when P > i × B — the payment must exceed the first month's interest. The calculator also runs a month-by-month simulation so the total interest and the chart match real statement rounding.

Real-world practical application

It is used to compare the avalanche method (extra payments toward the highest-APR balance first) against the snowball method, to see exactly how many months an extra $50 a month saves, and to decide whether a 0% balance-transfer offer is worth its fee before the promotional rate expires.

Frequently Asked Questions

Why does my balance barely go down each month?

On a high-APR card, most of a minimum payment is interest. At 22% APR a $6,000 balance accrues about $110 in the first month, so a $150 payment cuts the principal by only about $40. Paying more than the minimum is what breaks that cycle — and every extra dollar goes straight to principal.

Should I use the debt avalanche or debt snowball method?

With several debts, the avalanche (extra money toward the highest APR first) minimizes total interest. The snowball (smallest balance first) costs a little more but produces fast, motivating wins. Either is far better than paying only minimums.

Will a 0% balance transfer card help?

A 0% introductory APR can pause interest for 12–21 months so nearly every payment reduces principal. Budget for the 3–5% transfer fee and make sure you can clear the balance before the promotional period ends and the regular APR kicks in.

Related Calculators

Compound Interest — the same math working for you instead of against you.
Auto Loan Calculator — payoff math for an installment loan.
Rule of 72 — how fast debt at a given APR would otherwise double.