Credit card statements advertise the minimum payment like a favor: just $160 on your $8,000 balance this month. What the statement buries is the timeline -- at 22.99 percent APR with 2 percent minimums, that balance takes over 30 years to clear and costs more than $20,000 in interest. The minimum is not a repayment plan; it is a profitability plan, for the bank.

This calculator exposes it. Enter your balance, APR, the minimum payment percentage, and the minimum floor -- usually $25 -- and it simulates month after month: interest accrues, the minimum is computed, the balance inches down. The outputs are the ones that change behavior: the first month's payment, the months to payoff, the total paid, and the total interest. Watching a $8,000 purchase metastasize into $28,000 of payments does what lectures cannot.

The escape hatch is paying even slightly more than the minimum. An extra $100 a month on that same balance can cut the payoff from decades to under seven years and save five figures in interest. Run your real numbers, then run them again with a fixed payment $50 or $100 higher, and tape the comparison to your fridge until the balance is gone.

With the pre-filled defaults — Current Balance $8,000, Annual Percentage Rate (APR) 22.99%, Minimum Payment % 2%, Minimum Payment Floor $25 — the Credit Card Minimum Payment Calculator returns Monthly Interest Rate 0.0192%, First Month's Minimum Payment $160.00, Months to Pay Off 171, Total Amount Paid $205,311.76, Total Interest Paid $197,311.76. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.