What Is APR on a Loan, and How Is It Calculated?

Published October 12, 2026

Free tool: APR Calculator→

Two loans can have the same interest rate but very different costs, because one charges more fees. The annual percentage rate, or APR, solves this by folding the fees into a single yearly rate, so offers can be compared on one number. This guide explains how APR is calculated, why it matters most on short loans and what it leaves out, using the free APR Calculator.

Interest rate vs APR

• The interest rate sets your monthly payment.
• The APR reflects the payment and the fees you pay to get the loan, spread over the loan's term.

In the US, the Truth in Lending Act requires lenders to disclose the APR, which is why it appears on loan offers and credit card agreements.

How APR is calculated

APR is the interest rate at which your monthly payments are worth exactly the amount you actually receive: the loan amount minus any fees you pay up front.

Example: a $200,000, 30-year mortgage at 6% with $4,000 of upfront fees:

• Monthly payment (based on the 6% rate): $1,199.10
• Amount you effectively receive: $200,000 − $4,000 = $196,000
• The rate at which 360 payments of $1,199.10 are worth $196,000: 6.19% APR

Fees hit short loans harder

Fees are spread over the number of payments, so the same fee raises the APR far more on a short loan. A $300 fee on a $10,000, 3-year loan at 8% raises the APR to about 10.08%. Spread over 30 years, the same fee on the same loan would raise the APR only to about 8.32%.

Fees paid upfront vs added to the loan

If fees are added to the loan instead of paid upfront, you borrow more and pay interest on the fees. On the mortgage example, financing the $4,000 raises the payment to about $1,223.08. The APR hardly changes, about 6.19% either way, because the fees are a cost of the loan whether you pay them at closing or over time. What changes is the cash you need up front and the size of the payment.

What APR leaves out

APR is a comparison tool, not a complete cost:

• For mortgages, some closing costs, such as appraisal, title insurance and credit report fees, are generally excluded.
• It assumes you keep the loan for the full term. If you repay early, upfront fees weigh more heavily than the APR suggests.
• Variable-rate loans can change after the initial period.

Compare the full list of costs on each lender's disclosure, and look at the total cost if you might repay early; the Loan Comparison Calculator shows that month by month.

How to use the APR Calculator

1. Open the APR Calculator.
2. Enter the loan amount, the interest rate and the loan term.
3. Enter the fees, split into fees paid upfront and fees added to the loan.
4. Read the results: the APR, the monthly payment, the amount financed (what you actually receive), the finance charge (all interest and fees) and the total fees, with a breakdown of where the money goes, a chart of how upfront fees raise the APR and a table of the APR at different fee levels.

Frequently asked questions

What is APR?

The yearly cost of a loan including interest and most lender fees. A loan with fees has an APR higher than its interest rate.

Is a lower APR always better?

For loans you'll keep for the full term, the lower APR is usually the cheaper loan. If you'll repay early, a loan with lower upfront fees can be cheaper even with a higher APR.

Why is my APR higher than my interest rate?

Because the APR includes fees such as origination or points. The more fees, and the shorter the loan, the bigger the gap.