Credit card interest is calculated daily on the average daily balance. The daily rate is APR / 365. Each day, interest is added to your balance, and the next day's interest is charged on the new, slightly higher balance — pure compounding. This is why a 22% APR actually costs about 24.36% effective annually. When you pay only the minimum, most of your payment goes to interest instead of principal, so the balance barely moves. Paying $50 or $100 above the minimum has an outsized effect because the entire extra amount reduces principal, which reduces tomorrow's interest, which frees up more of next month's payment for principal — a snowball in your favor.
Credit Card Payoff Calculator
credit_card Card & Payment Details
US average in 2026: 22-24%
12 = 1 year, 60 = 5 years
Minimum payment rules
analytics Payoff Schedule
lightbulb Tips
percent 2026 Credit Card APRs (US)
warning Minimum Payment Trap
$5,000 at 22% APR with 2% minimum:
Tripling the minimum cuts this to ~20 months, $1,050 interest.
lightbulb Payoff Strategy
- 1.Avalanche — pay highest APR first (saves most interest)
- 2.Snowball — pay smallest balance first (builds momentum)
- 3.Balance transfer — 0% APR card, pay 3% fee, clear it in promo period
- 4.Negotiate APR — call issuer, ask for a rate reduction
- 5.Freeze the card — don't keep adding new charges
function Payoff Formula
r = APR / 12 / 100
Total Interest = N·P - B
B = balance, P = monthly payment, N = months to payoff
How to Use This Calculator
Enter balance and APR
Put in the current credit card balance and the purchase APR from your statement.
Pick a mode
Fixed payment, target payoff time, or minimum payment — the inputs update to match.
Enter the variable
Either your monthly payment (fixed mode) or target months (target mode). Minimum mode needs no extra input.
Review the payoff schedule
See months to zero, total interest, and total paid. The first-month breakdown shows how much goes to interest vs principal.
Tune for savings
Increase the payment by $50 or $100 and watch months and interest fall dramatically — every extra dollar is pure principal.
The Formula
The fixed-payment formula is the classical amortization solution: N = −log(1 − rB/P) / log(1 + r). If P ≤ rB, the payment does not even cover monthly interest and the balance grows forever — the calculator flags this. For target-time mode we invert the formula to solve for P: P = rB / (1 − (1+r)^−N). For minimum-payment mode, most US issuers compute the minimum as max(floor, percent × balance) — typically max($25, 2% × balance) — and the balance is simulated month by month because the payment decreases with the balance.
N = -log(1 - (r × B) / P) / log(1 + r) | r = APR / 12 / 100 | Total Interest = N × P − B
lightbulb Variables Explained
- B Current credit card balance (principal)
- APR Annual percentage rate charged by the card issuer
- r Monthly periodic rate (APR / 12 / 100)
- P Fixed monthly payment you commit to
- N Number of months to pay off the balance
- Total Interest Total interest paid over the payoff period
tips_and_updates Pro Tips
Always pay more than the minimum — the 2% floor on a $10,000 balance at 22% APR takes 30+ years to pay off and costs over $20,000 in interest
Rank cards by APR (avalanche method) to minimize total interest, or by smallest balance first (snowball method) to build momentum through quick wins
Consider a 0% balance transfer card if your credit qualifies — a 3% transfer fee is almost always cheaper than 22% APR carried for a year
Cut up or freeze the card while paying it off — continuing to charge it resets the payoff clock and is the #1 reason payoff plans fail
Set up automatic payments above the minimum to guarantee on-time payments and avoid the penalty APR (often 29.99%)
Round up payments to the nearest $50 or $100 — small increases dramatically shorten payoff time because extra dollars go 100% to principal
If you get a tax refund, bonus, or stimulus, throw it at the highest-APR card — a one-time $1,000 payment can save months of interest
Negotiate your APR — call the card issuer and ask for a rate reduction; a 3-5 point drop on a $10,000 balance saves $300-500/year
A $5,000 balance at 22% APR with a 2% minimum takes about 228 months (19 years) to pay off and costs roughly $6,800 in total interest — you pay $11,800 to borrow $5,000. Triple that payment to about 6% (so around $300/month fixed) and the same balance clears in 20 months with $1,050 in interest. That's the power of getting above the minimum. Our calculator's minimum-payment mode simulates the declining minimum month-by-month so you see the real timeline — not the issuer's convenient marketing number.
If you have two or more cards, the two classic strategies are avalanche (pay minimums on all, throw everything extra at the highest-APR card) and snowball (pay minimums on all, throw everything extra at the smallest balance). Avalanche saves the most total interest — it's mathematically optimal. Snowball gives you quick wins: that first card cleared in 3 months is a huge motivation boost. Harvard Business Review research found that snowball users were more likely to complete their payoff plan, so their real-world total cost was lower. Pick the method you'll actually stick with, then use our calculator to model each card individually.
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Data sourced from trusted institutions
All formulas verified against official standards.