NewCredit.cards

Free browser-based tool

Credit Card Interest Calculator

Estimate payoff time, total interest, and total repayment under a transparent monthly model. Change the assumptions, inspect every month, and export the schedule locally.

Model: monthly approximationPrivacy: inputs stay in this browserCurrency: U.S. dollars for display

Your scenario

Enter the model inputs

The starting values are a hypothetical example, not a “typical” APR or recommended payment. Replace them with rounded figures from your statement.

$0 to $1,000,000
0% to 100%; check your statement
Must be greater than $0
Use $0 to model payoff with no new charges

Do not enter a card number, bank login, Social Security number, or exact account credential. This form does not submit data to a server.

Estimated result

Payoff and interest

Adjust the hypothetical inputs, then select Calculate. Your full schedule will appear here.

Published method

What this calculator does

Every month uses the same disclosed approximation. The final payment is reduced to the amount actually needed.

The model repeats until the balance reaches $0 or 1,200 months. It warns after month one if interest plus new spending prevents the balance from falling. It also reruns the same scenario with a payment $50 higher so you can compare interest and duration.

Read before relying

Assumptions and limits

This is an educational planning model, not an issuer statement calculation or payoff quote.

ApproximationMonthly, not daily

The model uses APR divided by 12. Real issuers may calculate with daily periodic rates and average daily balances.

Simplified timingOne payment and spend amount

It does not place individual purchases, payments, fees, or credits on exact calendar dates.

Agreement controlsNo fees or APR buckets

Cash advances, transfers, promotions, fees, compounding, and payment allocation can require separate modeling.

Grace periodInterest is assumed

Set APR to 0% to model a scenario with no interest. The tool does not decide whether a grace period applies.

Need an exact payoff?Contact the issuer through a verified channel. Interest may continue between a statement date and the day a payment is received, creating residual or trailing interest.

Learn the underlying rules

Sources and next steps

  1. [1]Consumer Financial Protection Bureau, How does my credit card company calculate interest?
  2. [2]CFPB, Credit card agreement database for issuer-submitted general terms.