See how much interest your credit card balance costs you each month and year. Understand the true cost of carrying a balance with your current APR.
Credit Card Interest Calculator helps you make informed financial decisions using current rates and proven formulas. Adjust the inputs below to match your situation and see your personalized results update in real time.
Results are estimates only. Not financial advice.
🔒 Financial Disclaimer: These calculations are estimates for informational purposes only. Results are not financial advice. Consult a qualified financial advisor before making major financial decisions.
Calculations based on publicly available data from government agencies. Actual results may vary based on individual circumstances.
This credit card interest calculator reveals the monthly and annual cost of carrying a balance on your credit card. The methodology calculates the daily periodic rate by dividing your APR by 365, then multiplies it by your average daily balance to estimate monthly interest charges. It also shows how minimum payments are primarily applied to interest with only a small amount reducing principal. Understanding interest costs is essential because credit card debt is among the most expensive consumer debt, with rates averaging 20-25% APR. The calculator illustrates the "interest trap" where making only minimum payments keeps you in debt for decades. Real-world applications include understanding the true cost of a purchase when paying over time, motivating debt payoff by showing interest amounts in concrete dollar terms, and comparing the cost of making only minimum payments vs. paying a fixed amount. Limitations include not accounting for variable rates, new purchases during the billing cycle, and promotional 0% APR periods.
Result: A $5,000 credit card balance at 22% APR accrues approximately $91.67 in interest per month ($5,000 x 22% / 365 days x 30 days), or about $1,100 per year. If your minimum payment is 2% of balance ($100), only about $8.33 would reduce your principal while $91.67 goes to interest, meaning less than 9% of your payment actually pays down the debt.
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