Scenario 1
Standard debt payoff
$5,000 balance, 20% APR, $150/month → 44 months to pay off, $1,600 in interest.
Trusted by freelancers and business owners
Credit Card Interest Calculator
See the real cost of credit card debt — and how much you save by paying more each month.
Adjust your inputs
Results update instantly as you type or drag.
1 – 100,000
$
1 – 50
%
Found on your credit card statement
1 – 100,000
$
Quick insights
Total interest paid
$2,500
Total paid
$7,500
Quick answer
How is credit card interest calculated?
Daily rate = APR ÷ 365. Interest = Balance × Daily rate × 30 (approx). On a $5,000 balance at 20% APR, monthly interest is ~$83.
How it works
From inputs to result in four steps
A quick walkthrough of what this calculator does behind the scenes.
- 1
Enter your current credit card balance.
- 2
Enter the APR (Annual Percentage Rate — on your statement).
- 3
Enter your monthly payment.
- 4
See months to pay off and total interest paid.
Formula
The math behind the number
No black box — here's exactly how the result is computed.
Formula
Monthly rate = APR ÷ 12 ÷ 100
Months = −ln(1 − Balance×rate/Payment) ÷ ln(1+rate)
Total interest = Payment×Months − BalanceExamples
Real-world scenarios
See how the numbers play out for typical use cases.
Scenario 2
Paying more saves big
$5,000 balance, 20% APR, $250/month → 24 months, $1,000 in interest — $600 saved by paying $100 more.
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