Money Tools

Credit Card Interest Calculator

Estimate payoff time, total interest, and total paid based on balance, APR, and monthly card payment.

Updated April 11, 2026
Free online tool
Planning and research use

Why this page exists

Credit card balances shrink slowly when the payment barely clears the monthly interest. This calculator estimates how long payoff will take and how much interest you may pay along the way at a given payment level.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Credit card interest calculator

Estimate card payoff time and total interest.

Result

4 years 4 months

Estimated payoff timeline and total interest based on a fixed monthly card payment.

Estimated payoff time4 years 4 months

Total interest$4,492

Total paid$12,292

Monthly payment$240

Interest adds about $4,492 to the balance over the payoff period.
Even a small payment increase can shorten the timeline sharply once monthly interest is covered.
If you are considering a balance transfer, rerun the estimate with a lower APR to compare outcomes.

This model assumes no new charges, no late fees, and a steady APR during payoff.

Planning note

Last updated April 11, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Enter the current balance, APR, and monthly payment to model how the balance declines over time.

The calculator runs a month-by-month payoff schedule until the balance reaches zero or flags the payment as too low to work.

Review the payoff timeline, total interest, and overall amount repaid so you can decide whether to raise the payment.

Understanding your result

The payoff time tells you how long the balance may stay with you, while the total interest shows the price of carrying it. Often the most important insight is how much a modest payment increase changes both numbers.

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Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Compare minimums to a faster plan

Run the current payment first, then increase it to see how much time and interest can be saved by paying extra each month.

Test different APR assumptions

If you are considering a balance transfer or a promotional rate, changing the APR shows the impact on payoff speed.

Spot impossible payment levels

If the monthly payment does not even cover monthly interest, the calculator warns that the balance will not decline.

FAQ

Common questions

What happens if my payment is too low?

If the monthly payment is lower than the monthly interest charge, the balance will not pay off under the current assumptions.

Does this include late fees or new purchases?

No. It assumes the existing balance is being paid down without additional charges, penalty APRs, or late fees.

Why do small payment increases matter so much?

Because a larger share of each payment goes toward principal once the monthly interest is covered, which accelerates the payoff schedule.

Related tools

Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Money ToolsUpdated April 11, 2026