APR Calculator

What this calculator does

The APR Calculator estimates annual percentage rate so borrowing costs can be compared on an annualized basis. Depending on the inputs available, APR may reflect interest together with specified loan fees.

How to use the calculator step by step

Enter the loan amount, interest or finance charge, fees, and term using consistent units. Review whether the calculator treats fees as financed or paid separately because that changes the effective borrowing cost.

How the calculation works

APR converts borrowing cost into an annual rate relative to the amount financed. For simple examples this can be approximated from finance charges and term, while installment loans may require a cash-flow calculation.

Worked example and scenario testing

Two loans can advertise the same interest rate but have different APRs when one includes larger origination or mandatory finance fees. The loan with the higher APR generally has the higher annualized borrowing cost.

How to interpret your result

APR is useful for comparison, but it does not by itself show the total amount paid or whether one loan has a longer repayment period.

Accuracy, assumptions, and limitations

Official lending disclosures may use jurisdiction-specific rules, excluded fees, timing conventions, and rounding requirements that a general calculator cannot fully reproduce.

Common mistakes to avoid

Avoid comparing APR with APY or assuming APR equals the advertised interest rate when finance charges are included.

Privacy and browser-based calculations

Only loan and fee amounts are required. Never enter account numbers, Social Security numbers, or lender login credentials.

Frequently asked questions