Credit Card Interest Calculator — See Your True Cost

Calculate exactly how much interest you pay each month and year on your credit card balance — and see the total cost of carrying that debt over time at any APR.

Quick answer: Credit card interest is usually calculated from average daily balance and APR. Carrying a balance compounds quickly, so even small extra payments can reduce total interest.

Modeled Total Interest

$1,719

Modeled Total Interest

$1,719

Approximate First-Month Interest

$143

Signed Payment Above First-Month Interest

$307

Modeled Months to Payoff

Modeled Final Payment

$269

Diagnostic

Your fixed payment is $307 above first-month interest. A positive amount is required for the modeled payoff schedule.

Modeled payoff time is 22 months and total interest is $1,719; zero payoff months means the payment does not amortize the balance.

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What to do next

At this pace you will be debt-free in about 22 months, paying $1,719 in interest. Paying more each month, or moving the balance to a 0% card, shortens both.

Your action plan

1
Calculate the baseline result with your current numbers
Estimate payoff time and interest with an explicit non-amortizing-payment check.
2
Pressure-test one alternate scenario before deciding
Assumptions change the answer, especially when rates, taxes, or timing matter.
3
Save the result to Money Map or use the linked next action
Turn the result into a prioritized action instead of treating it as a one-off number.

Explore balance transfer options

This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

Calculator action path

Turn this result into a decision

Every SwitchWize calculator connects to a product comparison, rate context, guidance, alerts, and Money Map.

Rate authority hub

Compare

You could gain ~$2,682/yr — compare nowMove from calculation to current product options.

Rate Trend

Track card aprsUse market context before you decide when to act.

Guide

The Balance Transfer Fee Isn't the Cost. Every Month You Wait Is.A transfer fee is prepaid interest, and it almost always pays for itself within a couple of months. The real risk is the deferred-interest trap and the reset date, not the fee. Here is the exact month the math flips, worked with real numbers and a calculator that runs yours.

Money Map

Map this $2,682/yr opportunitySave this opportunity and see how it fits your broader money plan.

Alert

Create a rate alertWatch the market instead of checking manually.

Top card picks

Reviewed Aug 14, 2026 · Methodology

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Advertising disclosure: SwitchWize may earn a referral fee if you open an account through a link above. This does not affect our rankings. Ranked using the SwitchWize methodology. Learn more

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Frequently Asked Questions

Everything you need to know.

How do I find my credit card APR?

Your APR is on every monthly statement, usually labeled 'Purchase APR' or 'Variable APR'. You can also find it in your cardmember agreement. The average purchase APR in 2026 is over 21% — far above any savings rate.

Is the Credit Card Interest Calculator — See Your True Cost free to use?

Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.

Does using the Credit Card Interest Calculator — See Your True Cost affect my credit score?

No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.

Are the results personalized financial advice?

No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.

What should I do after seeing the result?

Use the recommendation module on this page to explore balance transfer options, or run Money Map to compare this debt payoff decision with your other opportunities.

How does SwitchWize choose related offers?

Related offers are matched by the calculator surface (cards) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.

How fresh are the rates and offers shown?

Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.

Where can I see the ranking methodology?

The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.

Can Money Map use this result?

Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.

Why This Matters

Credit card interest compounds daily. A $3,000 balance at 24% APR costs $720/year in interest — money that funds the bank, not your future. Seeing the real number motivates action.