§ Tool · tier 1 · independent
Credit Card Interest Calculator.
Calculate how much interest you're paying on your credit card balance
CalculatorFree, no signupOn-deviceupd May 2026
Inputs
Your numbers
Awaiting inputs
Move the sliders or type in the form on the left — the math updates live as you go. Click Get AI verdict when you want a written analysis.
Credit card interest compounds daily and adds up fast. This calculator shows you exactly how much you're paying in interest and how long it will take to become debt-free.
§ Worked examples
Real-world scenarios
$5,000 Balance at 20%
$5,000 balance at 20% APR, paying $200/month with no new purchases.
Inputs
balance:5,000rate:20payment:200
Time to payoff: 32 months. Total interest: $1,364. If you only paid minimum ($100): 9+ years and $5,840 interest!
§ FAQ
Questions Australians ask
§ GlossaryPurchase Rate The interest rate charged on purchases when you don't pay your balance in full. Daily Interest Credit card interest is calculated daily (rate ÷ 365) and compounds. Minimum Payment Usually 2-3% of balance or $25, whichever is higher. Designed to maximize interest paid.