APR Calculator: Turn Any Fee Into an Annual Rate

Amount, fee, term: three inputs, and the annualized rate every offer hides behind its fee.

The APR is the only number that compares offers of different sizes, fees and terms on equal footing. Enter the amount, the flat fee, and the term in days. The calculator returns the annualized APR, the fee restated per $100, and the total repayment.

The defaults hold the canonical case: a $75 fee on $500 for 14 days is 391% APR, $15 per $100. The same $75 on a 31-day term is only 176% APR, which shows honestly that the term, not just the fee, drives the annualized number.

Two boundaries keep the tool honest. It prices the fee you enter; a contract can add charges an advertisement’s APR omits, and the binding figure is the one in the disclosure you sign. And for covered servicemembers and dependents, the Military Lending Act caps the cost at 36% APR no matter what the market offer says.

Amount borrowed, $ Flat fee, $ Term in days

Annualized APR

Per $100 borrowed

Total repayment

The legal context for every state sits in the rates and fees table, and the boundary rules are in our APR disclosure.

With the APRs lined up, the honest comparison is the total of payments against your budget. The installment and slack tools cover the payment side, and the request form prices real offers in minutes.

Frequently asked questions

What is APR, in plain words?

The yearly cost of credit. The calculator takes the fee an offer charges and asks what rate that fee would equal if it repeated for a year at this term. It is the only number that compares offers of different sizes and terms fairly.

How do I compare a payday loan with an installment loan?

By APR first, then by total dollars. A $75 fee on $500 for two weeks is 391% APR; a $1,300 installment at 130% APR costs $534.89 in interest over six months. The first is bigger per dollar per year, the second in total dollars.

Does the APR include every fee?

It includes the fee you enter. Contracts can add origination charges, ancillary products or returned-payment fees. The calculator is the baseline; the signed disclosure is the binding number.

What counts as a high APR?

For context: 36% is the Military Lending Act ceiling for covered borrowers and the common benchmark for affordable credit. Most licensed payday products annualize between 390% and 660%. Nearly everything this site prices lives between those numbers.

Reviewed by Ray Drummond, Reviewer, credit counseling background. Every fee, cap, and formula on this page was checked against the published state rules.

Last reviewed: 2026-10-06