Finance Charge Calculator – Credit Cards and Loans

The finance charge is the price of borrowing, expressed in dollars rather than as a rate. On a credit card statement, it is the interest for the month. On a loan, it is all the interest you’ll pay plus upfront finance fees. This calculator handles both, so you can check a statement or compare the true cost of two loans.

How to use the finance charge calculator

For a credit card:

Enter your average daily balance for the billing cycle.
Enter the card’s APR and the days in the billing cycle.

For an installment loan:

Choose An installment loan.
Enter the amount borrowed, the interest rate, the term in months and any upfront finance fees.

The results show the finance charge plus, for a card, the daily periodic rate and the yearly cost at this balance, or, for a loan, the monthly payment and the interest part of the charge.

How the finance charge is calculated

Credit cards (average daily balance method):

average daily balance = sum of each day's balance ÷ days in the cycle
daily periodic rate = APR ÷ 365
finance charge = average daily balance × daily periodic rate × days in the cycle

Installment loans:

finance charge = (monthly payment × number of payments − amount borrowed) + finance fees

Worked example: a credit card

Your balance was $1,800 for 10 days and $2,700 for the other 20 days of a 30-day cycle, on a card with a 22.99% APR.

Average daily balance: (1,800 × 10 + 2,700 × 20) ÷ 30 = $2,400.
Daily periodic rate: 22.99% ÷ 365 = 0.06299%.
Finance charge: 2,400 × 0.0006299 × 30 = $45.35. Carried all year, that balance costs about $551.76.

Worked example: a loan

A $15,000 loan at 9% for 48 months with a $200 origination fee has a payment of $373.28. The interest totals $2,917.23, so the total finance charge is $3,117.23.

Ways to lower your finance charges

Pay credit cards in full to keep the grace period.
Pay early in the cycle. A lower balance for more days lowers the average daily balance. Paying $1,000 on day 5 of a 30-day cycle instead of day 25 cuts the average by about $667 and the month’s charge by about $12.60 at 22.99%.
Ask for a lower APR. Card issuers sometimes lower the rate for customers with a good payment history, and it costs nothing to ask.
Ask about fees. Origination and processing fees are part of the finance charge, and some are negotiable.
Compare loans by APR as well as the monthly payment. The APR calculator shows how fees raise the true rate.

To see how extra payments shrink the total interest on a loan, use the loan payoff calculator.

Common mistakes

Using the statement balance instead of the average daily balance. Most cards charge on the average.
Dividing the APR by 12 for a daily rate. The daily periodic rate is APR ÷ 365 (some issuers use 360).
Forgetting cash advances. They usually have a higher APR and no grace period.
Leaving fees out of a loan comparison. Two loans with the same rate can have very different finance charges.

Frequently asked questions

What is a finance charge?

It is the total cost of borrowing in dollars, interest plus certain fees. On a credit card statement, it is the interest charged for the billing cycle. On a loan, it is all the interest over the term plus prepaid finance fees, as shown in the Truth in Lending disclosure.

How do credit cards calculate the finance charge?

Most use the average daily balance method. They add up your balance at the end of each day in the cycle, divide by the number of days, then multiply by the daily periodic rate (APR ÷ 365) and the number of days in the cycle.

How can I avoid credit card finance charges?

Pay the full statement balance by the due date every month. Most cards then give a grace period on new purchases, so no interest is charged. Carrying any balance usually removes the grace period until it is paid in full.

Is the finance charge the same as APR?

No. APR is a yearly rate, and the finance charge is the dollar cost. The APR is calculated from the finance charge and the amount financed.

Last updated November 2, 2026 · By the ZTool team