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Credit Card Interest & Minimum Payment Calculator

Most US credit cards charge 20%–30% APR, and the average rate on accounts that actually carry a balance has stayed above 21% since 2023. The statement's “minimum payment due” looks harmless, but at these rates it barely outruns the interest: on a $5,000 balance at 24% APR, the first month adds $100 of interest, and a typical 3% minimum payment of $153 cuts what you owe by just $53. This calculator runs the month-by-month payoff simulation and tells you exactly how many months (or decades) your payoff takes, and what it costs in total.

Method: US issuers compute interest with a daily periodic rate — your APR divided by 365, applied to the average daily balance each cycle. This calculator approximates that with a monthly cycle (APR ÷ 12 on the running balance), which lands within a fraction of a percent of the daily method. The minimum payment is recomputed every month as the greater of your percentage and a flat dollar floor, and no new purchases are added during the payoff.

US issuers typically use 1%–4% of the balance, or 1% of the balance plus interest — check your cardholder agreement.

The flat dollar minimum — usually $25–$35.

Time to zero

16 years

192 monthly payments

Total interest

$8,006

Total paid

$13,006

260% of the original balance

First month on your numbers: $100.00 of interest accrues before your payment is applied. Anything you pay below that figure makes the balance grow.

The minimum-payment trap, in one line

$5,000 at 24% APR, paying only the minimum (3% of the balance, $35 floor): 16 years to pay off and $8,006 in interest — total outlay $13,006.

How to use the credit card interest & minimum payment calculator

  1. Enter your current balance from your latest statement.
  2. Set the APR with the slider — it's printed on every statement and in your cardholder agreement; 20%–30% is the normal US range, and store cards often sit at the very top of it.
  3. Choose a strategy: minimum payment (default 3% of the balance with a $35 floor — edit both to match your issuer's formula) or a fixed monthly amount.
  4. Read the results: months to zero, total interest, and total paid. If your payment can never clear the balance, the tool says so instead of pretending.

The minimum-payment math, worked for one month

Take $5,000 outstanding at 24% APR. Monthly interest ≈ 5,000 × 24% ÷ 12 = $100, so the balance becomes $5,100. The minimum payment at 3% is $153. After paying it, you owe $4,947 — your $153 bought just $53 of principal reduction. Repeat that every month (the minimum shrinks as the balance does, until the $35 floor kicks in) and the full payoff stretches to 192 payments — 16 years — with about $8,006 of interest on the original $5,000, a total outlay of $13,006. Pay a fixed $250 a month instead and the same debt clears in 26 months with $1,449 of interest. The exact figures for your inputs appear in the results above. And the formula matters: at a 2%-of-balance minimum, the simulation shows the balance does not even reach zero within 50 years.

Carrying a balance kills your grace period

The interest-free window between purchase and due date — the grace period, at least 21 days by federal rule — exists only while you pay the statement balance in full. The moment you revolve — pay anything less than the full statement balance — the grace period disappears: interest accrues daily on the unpaid balance, and new purchases start accruing from the transaction date with no grace at all. Paying the minimum on time protects you from late fees and a missed-payment mark on your credit report, but it does not stop interest for a single day.

Cheaper exits: a balance transfer to a card with a 0% introductory APR (typically 12–21 months, for a 3%–5% transfer fee), or a fixed-rate personal loan at a lower APR to clear the card in one shot. On $5,000 at 24% APR, interest runs about $100 a month, so even a 3% transfer fee ($150) pays for itself in roughly six weeks. Compare the personal-loan route with the loan payment calculator before choosing — the winner is whichever clears the debt at the lowest total cost over your realistic payoff period, not the lowest headline rate.

Frequently asked questions

How is credit card interest calculated in the US?

Issuers divide your APR by 365 to get a daily periodic rate, multiply it by each day's balance, and sum the result over the billing cycle (the average-daily-balance method). At 24% APR the daily rate is about 0.0658%, which compounds to roughly 2% per month — about $100 on a $5,000 balance. This calculator approximates the daily method with a monthly cycle: interest = balance × APR ÷ 12, then your payment is applied.

How long does it take to pay off $5,000 making only minimum payments?

At 24% APR with a minimum of 3% of the balance (floor $35), the simulation runs 192 months — 16 years — with about $8,006 in interest, a $13,006 total outlay on a $5,000 debt. Issuers that use gentler formulas make it worse: at a 2% minimum the balance never reaches zero within the 50-year simulation cap. Run your own APR and minimum formula above for the exact month count.

Why does the calculator say my payment never pays off the balance?

If your monthly payment is less than or equal to the first month's interest, the balance grows every month instead of shrinking — the debt never amortizes. On $5,000 at 24% APR that threshold is $100 a month. The tool flags this case instead of looping forever, and it also stops any simulation at 600 months (50 years).

Does paying only the minimum hurt my credit score?

Paying the minimum on time avoids a late-payment mark, but your credit utilization stays high because the balance barely falls, and utilization above roughly 30% of your limit suppresses your FICO score — amounts owed make up about 30% of it. High utilization also raises the rate offers you see when applying for new credit, compounding the problem.

I paid my full statement balance — why was I still charged interest?

Two common reasons. First, if you carried a balance the previous month, you lost the grace period, so interest accrued daily right up until your payment posted — that shows up as residual (trailing) interest on the next statement. Paying in full for one to two consecutive cycles restores the grace period. Second, cash advances never get a grace period and usually carry a higher APR from day one.

Is a balance transfer worth it?

Usually, if you can't pay in full and qualify for a 0% introductory offer. The math: a 3%–5% transfer fee up front versus 20%–30% APR avoided — on $5,000 at 24%, a $150–$250 fee replaces roughly $100 of interest every month, breaking even in six to ten weeks. The catches: the intro rate reverts to a standard 25%–30% APR after 12–21 months, new purchases on the transfer card may not share the 0% rate, and one late payment can void the promotional terms. Have a payoff plan that finishes inside the intro window.

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