Short answer: enter your balance, APR, and monthly payment above, and the calculator tells you your debt-free date, total interest, and total paid. If your payment barely covers the monthly interest, the balance never shrinks — the calculator warns you when that happens.
How to use this calculator
- Current balance — the amount you owe right now, from your latest statement.
- Annual interest rate (APR) — your card’s purchase APR, also on your statement. The US average has hovered above 20% in recent years, so don’t be surprised by a number in the low-to-mid twenties.
- Monthly payment — what you actually pay each month, not the minimum due.
- Extra per month (optional) — any additional amount you could put toward the card. This unlocks the side-by-side comparison showing exactly how much time and interest the extra payment saves.
Results update instantly as you type. Everything runs in your browser — your numbers never leave your device.
How the math works
Credit card interest compounds daily in reality, but the standard payoff formula uses a monthly approximation that is accurate to within a few dollars for planning purposes:
- Monthly rate = APR ÷ 12
- Each month: interest = remaining balance × monthly rate, then your payment first covers that interest and the rest reduces the balance.
- The number of months is solved with: n = −log(1 − r·B/P) ÷ log(1+r), where r is the monthly rate, B the balance, and P the payment.
Two things fall out of this formula that most people don’t realize:
First, there is a hard floor on your payment. If your monthly payment is less than or equal to one month’s interest (balance × APR ÷ 12), the balance never decreases — you’re treading water forever. On a $5,000 balance at 22.9% APR, one month’s interest is about $95. A $95 payment pays the card off never; a $100 payment takes decades. The calculator flags this trap explicitly.
Second, early payments are worth far more than later ones. Because interest is charged on the remaining balance, every dollar of principal you kill in month 1 also kills the interest that dollar would have generated in every future month. That’s why even a modest extra payment — $50 or $100 — can shave years off a payoff timeline.
A worked example
Say you owe $5,000 at 22.9% APR and pay $200 a month:
- Monthly interest at the start: $5,000 × 0.229 ÷ 12 ≈ $95.42
- Of your first $200 payment, $95.42 covers interest and only $104.58 reduces the balance.
- Debt-free in about 35 months (just under 3 years)
- Total interest: roughly $1,860
- Total paid: roughly $6,860
Now add $100 extra per month ($300 total):
- Debt-free in about 21 months
- Total interest: roughly $1,040
- You save about $820 in interest and 14 months of payments.
That $100 a month didn’t just save $100 × 14 in payments — it destroyed the compounding interest those balances would have produced. Try your own numbers above; the comparison panel makes the trade-off concrete.
Avalanche vs. snowball: which payoff method is better?
If you carry balances on multiple cards, the two popular strategies are:
The avalanche method — pay minimums on everything, throw all extra cash at the highest-APR balance first. Mathematically, this always minimizes total interest paid. If one card charges 24.99% and another 17.99%, every extra dollar should attack the 24.99% card.
The snowball method — pay minimums on everything, throw all extra cash at the smallest balance first regardless of rate. You pay slightly more interest overall, but you get the psychological win of killing a whole card sooner, which helps many people stick with the plan.
Our honest take: avalanche wins on math, snowball wins on behavior, and the best method is the one you’ll actually follow for two years. Run this calculator separately for each card to see each one’s timeline, then pick the order that keeps you motivated.
Why minimum payments are a trap
US card issuers typically set the minimum payment at around 1–2% of the balance (or a $25–$40 floor, whichever is higher). Minimums are designed to keep the account in good standing — not to get you out of debt.
On that same $5,000 balance at 22.9% APR, a 2% minimum payment starts at $100 and shrinks as the balance shrinks. Paying only the minimum stretches payoff past 20 years and costs more than $7,000 in interest — more than the original balance. If you take one lesson from this page: never pay only the minimum unless you truly have no choice.
Five realistic ways to pay off faster
- Automate a fixed payment above the minimum. Pick the number from the calculator, set autopay, and treat it like a bill.
- Time payments with your paycheck. Two half-payments per month (aligned with biweekly pay) slightly reduce average daily balance versus one monthly payment.
- Call and ask for a lower APR. Issuers sometimes grant a rate reduction to customers with good payment history — a 5-minute call that can save hundreds.
- Consider a 0% balance-transfer card if your credit qualifies. The transfer fee (usually 3–5%) is often far cheaper than months of 20%+ interest — but only if you pay the balance off before the promotional period ends.
- Stop adding new charges to the card you’re paying down. Use a debit card or a separate card for new spending so the balance you’re attacking actually shrinks.
Should you consolidate with a personal loan?
A common escape route from 20%+ card APRs is a debt-consolidation personal loan: you borrow a lump sum at a lower fixed rate, pay off the cards immediately, then repay the loan in fixed installments. Whether it helps depends entirely on the rate gap and the fees.
Example: $10,000 in card debt at 22.9% APR versus a 3-year personal loan at 12% with a 3% origination fee ($300):
| Credit card ($350/mo) | Personal loan (12%, 3 yrs) | |
|---|---|---|
| Monthly payment | $350 | ~$332 |
| Time to debt-free | ~40 months | 36 months |
| Total interest + fees | ~$3,900 | ~$2,250 |
The loan wins by roughly $1,650 — if you stop using the cards after consolidating. The classic failure mode is consolidating and then running the card balances back up, ending with both a loan payment and card payments. If you consolidate, cut up the cards (metaphorically or literally) and automate the loan payment.
What this calculator doesn’t do
- It models one card at a time with a fixed APR and fixed monthly payment. Real cards have variable rates, fees, and new purchases.
- It uses monthly compounding as an approximation; issuers compound daily, so real results may differ by a small amount.
- It doesn’t account for balance-transfer fees, annual fees, or penalty APRs.
- It is an educational planning tool, not financial advice. For persistent debt problems, a nonprofit credit counselor (NFCC member agencies offer free or low-cost counseling) can help.
Frequently asked questions
How long will it take to pay off my credit card?
It depends on three numbers: your balance, your APR, and your monthly payment. Enter them above for an exact timeline. As a rule of thumb, paying 5% of the balance each month clears most cards in about two years; paying only the 2% minimum can take over a decade.
How much interest will I pay on my credit card balance?
Multiply your balance by your APR for a rough yearly figure, but the true total depends on how fast you pay down. The calculator above simulates month by month and shows the exact total interest for your payment plan — plus how much an extra payment saves.
Is it better to pay off the highest interest card or smallest balance first?
Paying the highest-APR card first (the avalanche method) always minimizes total interest. Paying the smallest balance first (the snowball method) gives faster psychological wins. Choose avalanche for maximum savings, snowball if you need momentum — consistency matters more than the method.
What happens if I only make minimum payments?
Your balance shrinks very slowly because most of the payment covers interest. A $5,000 balance at typical APRs takes 15–20+ years on minimums alone and can cost more in interest than the original purchase. Always pay more than the minimum when you can.
Can this calculator handle multiple credit cards?
Run it once per card to see each card’s individual payoff date and interest cost. Then use the avalanche or snowball strategy to decide the order: list cards by APR (avalanche) or by balance (snowball) and direct extra payments accordingly.
Does paying extra really save that much interest?
Yes — disproportionately. Because interest compounds on the remaining balance, early extra payments eliminate not just principal but all the future interest that principal would have generated. Even $50 extra per month often saves many times that amount in interest.
Related calculators
- Loan Amortization Calculator — full payment schedules for installment loans
- Compound Interest Calculator — see what your money could earn instead
- Mortgage Calculator — monthly payment with taxes and insurance
Methodology reviewed September 2026. Calculations use the standard US monthly-interest amortization formula. This page is educational content, not financial advice.