About the Credit Card Payoff Calculator
Credit card minimum payments are engineered to keep you paying interest for many years: a $5,000 balance at a 22% APR paying only the minimum (typically $100 or so) can take the better part of a decade to eliminate, paying thousands in interest.
This tool answers the practical questions: how long at your current payment, how much interest that adds up to, and — when you raise the payment — the exact interest and months saved.
The formula behind it
Standard amortizing-payoff math on a revolving balance:
Months n = −log(1 − r·B/M) / log(1 + r) • Interest = M×n − BB = balance, r = APR/12 monthly rate, M = total monthly payment (your payment + extra). If M is at or below the monthly interest, the balance never falls and the tool reports that explicitly.
Worked example
Defaults — $5,000 at 22% APR, paying $200/month:
- Interest each month on that balance is about $91.67 — more than half of your $200 payment.
- Payoff is complete in about 34 months (2.8 years), charging about $1,800 in interest.
- Raise the payment to $300 — payoff lands at 21 months and interest falls to about $1,300. Roughly $500 saved and 13 months of payments gone.
Takeaway: Every extra dollar you send goes 100% to the balance — interest never gets a cut of it. That is why even a small raise collapses the timeline.
What moves the result
- APR — at 22–29% credit card rates, interest is the dominant budget line.
- Payment size — extra dollars always work into principal; there is no other luxury decision in credit card math.
- Statement cycle — card interest is computed on the balance at statement close; paying earlier in the cycle lowers the balance that accrues.
- New purchases — if required, this tool assumes you are not resuming spend on the card. Small new charges extend the timeline by months on a card like this.
Practical tips
- Always pay more than the minimum: the “minimum payment” timeline on high-APR cards is measured in years and it costs thousands more.
- If you have more than one card, target the highest-APR one first (avalanche) — the debt-payoff tool can show their individual timelines.
- Add alerts: any month you carry a revolving balance at statement close is a month interest is charged on everything.
- Before making a 0% balance-transfer move, check the transfer fee math with the balance-transfer calculator.
- If the balance supports it, a personal installment loan over 3–5 years is often cheaper total than months and months of card interest.
Frequently asked questions
Does the tool assume I stop using the card for new charges?
Yes. New purchases reset the cycle, add balances and extend the timeline. Payoff math only works if you stop adding.
How does this differ from the loan-payoff calculator?
Same math engine — this one is drafted for a credit card, which is usually the highest-rate debt and also the easiest to grow back. Use the loan-payoff tool for installment debts.
What about cards with promotional 0% APR?
Set the APR to the promo rate for the promo months, then the promo-end rate. The balance-transfer calculator does this timing automatically.