Paying off one card vs. several
Credit card debt rarely arrives as a single, tidy balance — most people carrying a card balance have more than one, opened at different times, at different rates. This calculator handles either case: enter one card and every extra dollar goes to it automatically, or enter several and choose how the extra gets prioritized. On the two-card example loaded above — a $3,200 balance at 23.49% and a $5,800 balance at 17.99%, with $450 a month split by avalanche order — both cards clear in 25 months, at $1,913 in total interest.
Extra payments compound faster than they feel like they should
A payment above the minimum does not just shave a little time off the end of your payoff — it reduces the balance that interest accrues on starting the very next month, which means the benefit compounds forward for every remaining month of the schedule. This is why a modest, sustainable increase to your monthly budget tends to matter more than people expect before they run the actual numbers, and why the What-If chips in the calculator above are worth trying on your own balances rather than estimating in your head.
Concentrate extra payments — do not split them
A common instinct is to spread any extra money evenly across every open card, which feels fair but is mathematically the slowest option. Both snowball and avalanche work by concentrating every extra dollar on ONE target debt until it clears, then rolling that debt's entire payment — minimum included — onto the next one. Splitting thin means no single balance ever gets enough extra to clear meaningfully faster, so nothing frees up sooner for the next target.
Frequently asked questions
How do I calculate when my credit cards will be paid off?
Enter each card's balance, APR, and minimum payment, plus the total monthly budget you can put toward all of them combined. On a $3,200 card at 23.49% and a $5,800 card at 17.99%, with $450/mo split by avalanche order, both cards clear in 25 months at $1,913 total interest.
Should I pay off my credit cards one at a time or spread payments across all of them?
One at a time, with every extra dollar concentrated on a single target — either the highest rate (avalanche) or smallest balance (snowball) — clears debt faster and cheaper than splitting extra payments evenly. Spreading thin means no single card gets the momentum needed to clear and free up its minimum for the next one.
Does adding extra payments actually make a big difference?
Yes, and usually more than it feels like it should — extra payments go straight to principal, which reduces the balance that future interest accrues on. Try the "+$100/mo" What-If chip in the calculator above to see the exact months-and-dollars change on your own cards.
What if I only have one credit card to pay off?
The multi-card ordering questions (snowball vs. avalanche) do not apply with a single card — every extra dollar goes to it by default. See the Pay Off Credit Card Calculator for the single-card, fixed-payment framing.
How accurate is this compared to my actual statement?
The math (monthly compounding on APR ÷ 12) is a close standard approximation of how card issuers calculate interest, though your issuer likely uses a daily periodic rate on your average daily balance, which can differ slightly. For the minimum payment, use your card's actual required minimum for the most accurate schedule.