Credit card debt is among the most expensive forms of consumer borrowing, with average US interest rates hovering between 22% and 28% APR as of 2025. At these rates, a $5,000 balance with minimum payments of 2% of the balance would take over 20 years to pay off and cost more than $7,000 in interest alone — more than the original debt. The Federal Reserve reports that total US credit card debt exceeded $1.14 trillion in 2024, with the average cardholder carrying approximately $6,500 across all cards. Breaking free from credit card debt requires a clear payoff strategy: either the avalanche method (targeting the highest-interest card first to minimize total interest) or the snowball method (targeting the smallest balance first for psychological momentum). This credit card payoff calculator models both strategies and compares them side by side. Enter your card balances, interest rates, and monthly payment budget, and the tool shows your payoff timeline, total interest cost, and month-by-month amortization schedule for each approach. It also calculates how much you save by increasing your monthly payment above the minimum.
How credit card interest actually works
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.
Minimum payment trap: the eye-opening math
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.
Snowball vs avalanche for multiple cards
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.