What is this calculator for?
The minimum payment line on your credit card statement is one of the most expensive sentences in personal finance. It's designed by the card issuer to take as long as possible to clear the balance, because the longer you pay, the more interest they collect. On a $6,000 balance at 24% APR with a 2% minimum, paying only the minimum takes about 26 years and costs you roughly $10,300 in interest — almost double the original balance, on top of the original balance.
This calculator answers the question that the monthly statement obscures: how long will it take to pay off this card at the rate I'm paying, and what does that compare to paying it off in 12, 24, or 36 months. The contrast is the point. A $6,000 balance at 24% paid off in 24 months requires about $317/month and costs $1,608 in interest. Paid off in 12 months: $567/month and $806 in interest. Stretched to 60 months: $173/month and $4,358 in interest. The math is unambiguous — the faster you pay, the less interest goes to the card issuer and the more stays in your life.
Who needs this tool: anyone carrying a balance, anyone weighing whether to do a 0% balance transfer, anyone evaluating whether an avalanche (highest APR first) or snowball (smallest balance first) strategy fits their situation, anyone trying to figure out whether to accelerate credit card payoff or fund a savings goal first.
How to use this calculator
Enter the current balance as the most recent statement balance. If you're still actively spending on the card, list the average ongoing balance — but the calculator assumes you stop spending on the card. The math falls apart if you're paying $400/month while also charging $400/month of new purchases; you're treading water, not paying down.
APR (annual percentage rate) is on your statement, usually labeled "purchase APR" or "annual percentage rate." Credit card APRs in 2024-2025 typically run 19-29%, with rewards cards at the high end and credit-union cards at the low end. Your card may have different APRs for purchases, balance transfers, and cash advances — use the rate that applies to your current balance. If you're paying off mostly purchases at 22% but a chunk is a cash advance at 28.99%, model the average or run the calculator twice.
Pick your payoff strategy: a fixed monthly payment (you commit to $X every month) or a target payoff timeframe (you want to be debt-free in N months — let the calculator tell you the monthly amount needed). The fixed-payment approach is useful when your budget is already constrained ("I can afford $200/month and want to know how long that takes"). The fixed-timeframe approach is useful when you're committed to clearing the debt by a specific date and want to know the cost ("I want this gone in 18 months — what does that take").
Understanding your results
The calculator returns payoff time in months, total interest paid over that period, and total amount paid (principal + interest). The breakdown shows month-by-month or year-by-year balance progression.
The interest number is the one that matters. On a $6,000 balance, paying $200/month at 24% APR takes about 47 months and costs $3,450 in interest. Paying $350/month at the same rate takes about 22 months and costs $1,419 in interest. The extra $150/month "buys" you 25 months of freedom and saves $2,031. Phrased another way: an extra $150/month of payment generates a guaranteed 24% return on that money — better than nearly every investment available to retail investors. Credit card payoff is the highest-ROI investment most people will ever access; the catch is the "investment" returns by removing a 24% expense, not by paying you a yield.
For balance transfer cards offering 0% APR for 15-21 months, the math is dramatic. A $6,000 balance moved from 24% APR to 0% APR for 18 months, with no balance transfer fee, paid off at $334/month: $6,012 total paid, $12 in residual interest, debt clear. Compared to the original 24% card path at the same $334/month: about 21 months to payoff, $968 in interest. The balance transfer is worth roughly $956 in interest savings, minus any balance transfer fee (typically 3-5% of the transferred balance — for $6,000, that's $180-300). After fees, the balance transfer still saves $650-770 if you actually clear the debt before the promo rate ends.
The balance transfer trap: if you don't pay off the balance before the promo rate expires, retroactive interest can be assessed back to day one (read the fine print — some cards waive retroactive interest, others charge it). The discipline required: balance transfer only works if you'll actually pay it off within the promo window.
A worked example
Tara is 29, a graphic designer in Atlanta, carrying a $4,800 balance on a rewards Visa at 26.4% APR. She's been paying the $96 minimum for 11 months and the balance has barely moved — from $5,200 down to $4,800, despite paying about $1,056 over the period. Most of her payments went to interest. She's done.
The calculator with her current trajectory: $96/month at 26.4% APR on $4,800 balance projects out to never paying off (the minimum payment is barely above the monthly interest of $105.60). The card is designed this way; minimum payments at high APRs can mean the balance grows monthly. She has to pay more than the interest cost or the math doesn't work in her favor.
She runs three scenarios. (1) $200/month: 34 months to payoff, $1,892 in interest, total paid $6,692. (2) $350/month: 17 months to payoff, $943 in interest, total paid $5,743. (3) $500/month: 11 months to payoff, $623 in interest, total paid $5,423. The jump from $200 to $350/month saves $949 of interest and 17 months of debt. The further jump from $350 to $500 saves $320 more — diminishing returns but still meaningful.
She decides on $350/month. Her budget: take-home $4,200/month, fixed expenses $2,800 (rent, utilities, food, transportation, insurance), discretionary $1,000 (entertainment, eating out, clothing), savings goal contributions $300. She redirects $300 from savings goal to debt payoff temporarily and pulls $50 from discretionary. New plan: $350/month for 17 months, debt-free by mid-2027. Then she redirects the full $350 back to savings, and the savings goal she paused for 17 months catches up faster than it would have if she'd kept dollar-cost-averaging into savings while bleeding 26% on the card.
One last optimization: she gets approved for a Discover It Balance Transfer card with 0% APR for 18 months and a 3% transfer fee. Transfer fee: $144. New balance: $4,944 at 0%. Same $350/month payment: 15 months to payoff, $0 in interest (assuming she clears it before promo ends). Net savings versus staying on the 26.4% card: $943 − $144 = $799. She does the transfer.
Related resources
For the broader debt-to-income picture, see the DTI Ratio Calculator — credit card minimums show up in DTI calculations for mortgage qualification. For evaluating other debt types alongside cards, the Loan Amortization Calculator handles fixed-rate installment loans and the Student Loan Calculator handles federal and private student debt. For redirecting freed-up cash flow after debt payoff, the Savings Goal Calculator and Compound Interest Calculator. The CFPB's credit card resource page publishes consumer-friendly guidance on debt management, scams, and federal protections under the CARD Act.