Credit card payoff calculator

How credit card interest actually works

Credit cards don’t charge interest the way a fixed loan does. Your card has an APR — an annual percentage rate — but it’s applied monthly. Divide the APR by twelve and you get the rate charged on your balance each month. At 22% APR that’s about 1.83% a month, so a $6,000 balance racks up roughly $110 of interest in the first month alone. If you don’t pay at least that much, the unpaid interest is added to what you owe and you start paying interest on your interest. That’s compounding working against you, and it’s why card debt feels like running up a down escalator.

The key number is how your payment splits between interest and principal. Only the part that goes to principal actually shrinks the balance. Early on, a big slice of every payment is eaten by interest, so progress feels painfully slow. As the balance falls, the monthly interest falls with it, and more of each payment finally bites into the principal — which is why the last stretch of a payoff goes far faster than the first.

Why minimum payments are a trap

Card issuers set the minimum payment low on purpose — often around 1–2% of the balance plus that month’s interest. It keeps your account current, but it’s engineered to keep you in debt. Because the minimum shrinks as your balance shrinks, you’re always paying a little less, stretching the payoff over a decade or more and quietly multiplying the total interest. Paying the minimum on a $6,000 balance at a typical APR can take well over fifteen years and cost more in interest than the original balance itself.

The fix is to pay a fixed amount every month instead of the falling minimum. That’s exactly what this calculator models. By holding your payment level, every reduction in interest is redirected into principal, so the balance falls faster and faster. A steady $250 a month does far more than a minimum that starts near $250 and drifts down to $80.

The “pay more” effect

The single most valuable thing this tool shows is what a small increase does. Because the extra goes entirely to principal, the savings compound: you cut the balance faster, which cuts future interest, which clears the card even sooner. The comparison table puts your current payment beside $50 and $100 more and highlights the months and the dollars you’d save. For most high-APR balances the result is dramatic — an extra $100 a month routinely turns a five- or six-year slog into something closer to two or three years, saving a four-figure interest bill in the process. Seeing those numbers side by side is usually the nudge people need to find the extra in their budget.

Avalanche, snowball, and balance transfers

If you’re carrying more than one card, the order you attack them in matters. The avalanche method throws every spare dollar at your highest-APR card first while paying minimums on the rest — mathematically the cheapest route. The snowball method targets your smallest balance first for a fast, motivating win. Our debt payoff planner lets you compare both across all your debts at once.

A balance transfer is the other big lever. A card offering 0% on transfers for a promotional period lets you pause interest entirely, so every payment attacks principal — powerful if you can clear most of the balance before the promo ends. Just weigh the transfer fee (typically 3–5%) and the go-to rate afterward against the interest you’d otherwise pay, which this calculator makes easy to see. Whatever route you choose, paying down balances also lowers your credit utilization, so it’s worth checking how that could lift your score with our credit score estimator. And if the debt already feels unmanageable, our guide on how to escape debt and get rid of credit cards walks through your options. This page is general information, not financial advice.