Minimum Payment Cost Calculator

How it works

A credit card minimum is designed to be small: typically the greater of about $25 or a slice of the balance plus that month’s interest. Because it barely exceeds the interest early on, almost nothing goes to principal, so the balance falls at a crawl and the payment shrinks along with it, stretching the payoff for years. The calculator replays that month by month using a common minimum formula:

With the defaults, a $5,000 balance at 24% APR starts with a minimum of about $150 a month, of which $100 is pure interest. Left on the minimum, it takes about 19.5 years to clear and costs roughly $8,887 in interest, so you repay about $13,887 on that original $5,000, nearly triple. That is the minimum-payment trap: the lower the payment, the more the card earns from you.

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A worked example: $5,000 at 24% APR, minimum only

Say you're carrying a $5,000 balance at 24% APR and you only ever send the minimum payment. It feels manageable month to month, but the calculator shows the real cost: $8,887 in interest alone.

That drip-feed approach stretches the payoff over 19.5 years, or 234 months. By the end you have handed the card issuer $13,887 to clear a $5,000 debt, so well over half of what you paid was pure interest.

Rate matters enormously here. On a low-rate card at 15% the interest would be $5,382, while a store card at 28% would run $10,472. That single difference is worth $5,090.

Drop in your balance and APR to see how long the minimum really keeps you paying.

Escaping the minimum trap

• Fix your payment. Instead of the shrinking minimum, pay a flat amount every month. Even a modest fixed payment slashes the years and interest, because the whole difference lands on principal.
• Stop new charges. Every purchase resets the trap. Pause spending on the card while you pay it down, or the balance never really falls.
• Target the highest rate. If you carry more than one card, throw extra at the steepest APR first, where the minimum trap bites hardest.

Why the minimum is built to shrink

The reason minimum payments stretch on for decades is baked into how they are calculated. Because the minimum is set as the interest plus a small slice of the balance, it falls a little every month as the balance falls. So just as you make progress, the required payment drops, easing off at exactly the moment holding it steady would have helped most.

The result is a long, flattening tail of ever-smaller payments.

• Early on, most of it is interest. On a high-rate balance the first minimums are almost entirely the interest charge, so barely anything reaches the principal.
• The payment shrinks with the balance. A declining minimum means the balance falls slower and slower, which is what turns a few thousand dollars into a multi-decade payoff.
• It is designed that way. A low, shrinking minimum keeps the account current while keeping the balance, and its interest, on the books for as long as possible.

That is the trap in a sentence: the payment that feels manageable is the one engineered to keep you paying the longest. Seeing the years and the total interest laid out side by side is usually enough to make the case for doing the opposite, and paying a steady amount instead of riding the minimum down.

A fixed payment changes everything

The fix for a shrinking minimum is to stop letting it shrink. Pick a flat amount and pay that every month, and because the extra above the interest all lands on principal, the payoff collapses from decades to a few years. Take the default $5,000 at 24%, which drags on for about 19.5 years and $8,887 in interest at the minimum, and hold the payment steady instead:

• A flat $150 a month: clear in about 4.7 years, roughly $3,300 in interest.
• A flat $200 a month: clear in about 3 years, roughly $2,000 in interest.
• A flat $250 a month: clear in about 2.2 years, roughly $1,450 in interest.

The starting minimum on this balance is around $150 anyway, so simply holding that first payment steady instead of letting it fall cuts nearly fifteen years and over $5,000 of interest off the total. Paying a little more compresses it further still. The single most powerful thing you can do with a card balance is refuse to ride the shrinking minimum down, and instead pay a fixed amount until the balance is gone.

If a flat payment still feels like a stretch, set it as high as you can bear and treat it as a floor you never drop below, even as the required minimum falls beneath it. Automating that fixed amount removes the monthly temptation to pay less, and it is the surest way out of the trap. The card is counting on you to ride the shrinking minimum down; a fixed payment is simply how you refuse.