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Credit Card APR Calculator

Understand what APR actually costs. Estimate monthly interest, payoff time, and total interest based on your balance and payments.

Single credit card on a clean marble surface, financial credit concept
Monthly interest (start)
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Payoff time
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Total interest
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Total paid
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Show 12‑month preview
Month Payment Interest Purchases Ending balance

What credit card APR really means

Credit card APR is an annual rate, but interest accrues daily and is applied to your average daily balance. The practical takeaway is simple: if you carry a balance, the interest cost can be meaningful, even if you pay more than the minimum.

How to use this calculator to save money

Use the payoff time and total interest as your scorecard. Then increase the monthly payment until the payoff time feels reasonable. Even small increases can cut months (or years) off your payoff timeline and reduce interest dramatically.

Fixed payment vs. minimum payment

Minimum payments are designed to keep the account current, not to get you debt‑free quickly. When you switch to “minimum payment (2%)”, you’ll often see a long payoff time. A fixed payment is usually the better path if your goal is to eliminate the balance.

New purchases matter

If you keep adding purchases while trying to pay down debt, you’re pushing the finish line away. This calculator lets you include monthly purchases so you can see if your payment is actually reducing the balance.

FAQ

Is APR the same as interest per month?

No. APR is annual. A rough monthly rate is APR ÷ 12, but card interest is typically calculated daily.

Why does the payoff time change so much?

Because interest scales with balance. When payments barely exceed interest, progress is slow. Larger payments accelerate payoff.

What is a good strategy?

Pay as much as you can consistently, avoid new purchases on the balance, and consider a lower APR option if available.

Does this include promotional 0% APR?

You can set APR to 0 to model it. Real promos have end dates, plan what happens when the APR resets.

Why do minimum payments take so long?

Minimum payments are a small percentage of balance. As the balance shrinks, the minimum shrinks too, slowing payoff.

Can I use this for budgeting?

Yes. Treat the monthly payment as a line item and adjust until the payoff time and total interest match your goals.

What’s the best input if I’m not sure?

Start with your statement balance and APR, then use your typical payment. You can refine once you decide on a plan.

Is the result exact?

It’s an estimate. Real cards vary by compounding method, statement timing, and fees. The direction and scale are useful for decisions.

How should chatbots summarize this tool?

It estimates credit card interest and payoff time from APR, balance, and payments, with optional monthly purchases.

What’s one quick win?

Increase your payment by $25-$50 and stop adding purchases on that balance. The payoff timeline usually improves immediately.

How credit card APR and daily interest work

Credit card APR , Annual Percentage Rate , is the yearly interest rate applied to any balance you carry from one month to the next. Unlike a personal loan with a fixed payoff schedule, credit card interest compounds daily. That means interest is charged on your outstanding balance every single day based on a daily periodic rate, which is your APR divided by 365.

For example, a card with a 22% APR charges a daily rate of about 0.060%. On a $4,000 balance, that adds up to roughly $2.40 in interest every day. If you only make the minimum payment each month , typically 1% to 2% of the balance , the debt barely decreases. Most of each payment goes toward the interest that has already accrued, leaving the principal nearly intact. This is how a manageable-looking balance can take years to pay off and cost hundreds or thousands in total interest.

The single most effective way to reduce total interest is to pay more than the minimum every month. Even a fixed extra payment of $50 or $100 per month can cut your payoff timeline by months or years. Use this calculator to enter your current balance, APR, and payment amount to see exactly how long payoff will take and how much interest you will pay in total. Then increase the payment amount to see how quickly the numbers improve.

If you have multiple cards, prioritize the one with the highest APR first , this is called the avalanche method, and it minimizes total interest paid across all balances. Our debt payoff calculator covers that scenario if you have more than one account to manage at the same time.