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Credit Card Payoff Calculator: How Long and How Much Interest
Enter a card balance and its interest rate, then choose a fixed monthly payment or a target number of months. The tool shows the time, the interest and a comparison with paying only the minimum.
How card interest works
Card interest is usually quoted as an annual percentage rate and charged on the balance. This calculator divides the APR by twelve to get a monthly rate, adds that month's interest to the balance and then subtracts your payment. Each cycle repeats with the new balance. Many issuers actually compute interest daily and apply a grace period to new purchases when the statement balance is paid in full, so your statement may differ slightly.
If you choose a target time instead of a payment, the tool uses the level-payment formula Payment = B × r ÷ (1 − (1 + r)−n), where B is the balance, r the monthly rate and n the months.
Why minimum payments are slow and costly
Minimum payments are often a small percentage of the balance, with a floor. Because the percentage shrinks as the balance shrinks, the payment falls every month and the last portion of the debt takes a very long time. Most of each early payment is interest. Enter your issuer's percentage and floor to see how your own minimum behaves. If the percentage barely exceeds the monthly interest, the balance falls very slowly, and the comparison in the results shows how many years that stretches the debt.
The alternative is a fixed payment. Even a modest fixed amount that stays constant as the balance falls pays the debt off far sooner and saves a large share of the interest.
Ways to pay less interest
- Pay more than the minimum, and keep paying the same amount when the minimum falls.
- Stop adding new purchases to the card while you pay it down, since new spending is not modelled.
- Check for a lower-rate option such as a balance transfer or consolidation loan, and include fees and the length of any promotional period before judging them.
- If you have several debts, the debt payoff calculator compares the avalanche and snowball orders.
What is not included
Late fees, annual fees, cash-advance charges, promotional rates that expire, and changes in the variable APR are not modelled. If your card has a rate that changes, rerun the numbers when it does. The results are estimates for planning.
A worked example shows the pattern. A 1,000 balance at 12% APR with a fixed payment of 100 takes 11 months and costs about 59 in interest. The same balance paid at 2% of the balance each month (20 at first) would take far longer, because the payment shrinks as the balance does. The gap between those two outcomes is the main reason to set a fixed amount rather than follow the statement.
If you carry balances on more than one card, run each separately or use the multi-debt tool, since a single combined rate would hide which card is the most expensive.
Worked example
An 8,000 balance at 19.9% APR that you want to clear in 36 months.
Inputs
| Card balance | 8000 |
|---|---|
| Annual interest rate (APR) | 19.9 % |
| I want to | Be debt-free in a set number of months |
| Target time | 36 months |
| Issuer minimum: percent of balance | 2 % |
| Issuer minimum: lowest payment | 25 |
Result
Paying 296.90 a month costs 2,688.44 in interest.
Paying only the minimum would take 54.2 years and cost 34,198.13 in interest, because the minimum shrinks as the balance falls.
| Monthly payment | 296.90 |
|---|---|
| Months to pay off | 36 (3 years 0 months) |
| Total interest | 2,688.44 |
| Total paid | 10,688.44 |
| Paying only the minimum: time | 650 months (54.2 years) |
| Paying only the minimum: interest | 34,198.13 |
| Interest saved against the minimum | 31,509.68 |
- The calculation assumes no new purchases, fees or rate changes, and charges interest monthly at one twelfth of the annual rate.
Financial disclaimer: Results are estimates for planning and education. They are not financial, tax or legal advice. Fees, taxes, rates and rules vary by lender, product and country, so confirm figures with your provider or a qualified adviser before making decisions.
Frequently asked questions
How long will it take to pay off my credit card?
Enter the balance, the APR and a fixed monthly payment. The calculator simulates each month and counts how many are needed to reach zero.
Why does paying the minimum take so long?
The minimum is usually a percentage of the balance, so it shrinks as you pay. Interest takes most of each early payment, and the last part of the debt falls slowly.
How much should I pay each month?
As much as your budget safely allows. Use the target-months option to see what payment clears the card by a specific date.
Why does the tool say my payment is too low?
A payment at or below the monthly interest never reduces the balance. The message tells you the interest charged in the first month.
Does this include new purchases?
No. It assumes you stop using the card while paying it off.
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References and sources
- Consumer Financial Protection Bureau: educational guides on credit cards and paying down balances. Link
- Level-payment formula and monthly interest accrual from introductory finance texts.