Credit Card Payoff & Interest Calculator

Find out how long it will take to pay off your credit card balance, how much interest you'll pay, and how much you could save versus minimum payments.

Mathematical Audit

Credit Card Payoff Formula

The calculator simulates your balance month by month: each month, interest accrues on your remaining balance at your card's APR ÷ 12, and the rest of your payment reduces the principal. It also compares this against an issuer-style minimum payment to show the cost of paying only the minimum.

Monthly Interest = Balance × (APR ÷ 12)
Principal Paid = Payment − Monthly Interest
New Balance = Previous Balance − Principal Paid
Months to Pay Off (closed form) = −ln(1 − (Balance × r) ÷ Payment) ÷ ln(1 + r), where r = APR ÷ 12
Typical Minimum Payment = greater of (Balance × 2%) or $25

If your payment is less than or equal to the monthly interest charge, the balance will never decrease — the calculator flags this case instead of showing an infinite payoff time. Choose 'Fixed Payment' to see how long a chosen payment takes, or 'Fixed Payoff Time' to see the payment required to clear the balance in a target number of months.

Operational Guide

How to Use the Credit Card Payoff Calculator

1

Enter your balance and APR

Input your current statement balance and your card's annual percentage rate (APR), both found on your monthly statement or card issuer app.

2

Choose your payment strategy

Pick 'Fixed Payment' to see how long a chosen monthly payment takes to clear the balance, or 'Fixed Payoff Time' to calculate the payment needed to be debt-free in a target number of months.

3

Select your display currency

Choose from USD, EUR, GBP, JPY, AUD, or CAD to see results in your preferred currency.

4

Click Calculate

View your payoff timeline, total interest paid, and a side-by-side comparison against making only the typical minimum payment.

5

Save or share your plan

Share a link with your exact inputs or save the calculation to your saved calculations library to track your progress later.

Real-World Scenario Example

"Someone has a $5,000 credit card balance at 22.99% APR and decides to pay a fixed $200 per month."

Inputs

balance:5000
apr:22.99
paymentStrategy:fixed-payment
monthlyPayment:200
targetMonths:24

Result

Paying $200/month clears the balance in 35 months and costs $1,871 in interest (total paid: $6,871). Paying only the typical minimum (~$100/month, 2% of balance) would take 167 months and cost $11,694 in interest — so the $200/month plan saves $9,823 and pays off the debt 11 years sooner.

Important Disclaimer

This calculator provides estimates for educational purposes only and does not constitute financial advice. Actual interest charges depend on your card issuer's compounding method, fees, promotional rates, and how minimum payments are recalculated each statement period. Refer to your cardholder agreement for exact terms.

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