Loan APR Calculator: True APR Including Fees

A loan APR calculator works out the annual percentage rate of a loan: the yearly cost of borrowing once fees are included. It finds the rate at which your scheduled payments, plus any monthly fees, are worth exactly the amount you actually receive after upfront fees. That puts offers with different rates and fees on the same footing.

How This Loan APR Calculator Works

Regulation Z defines the APR as “a measure of the cost of credit, expressed as a yearly rate, that relates the amount and timing of value received by the consumer to the amount and timing of payments made” (12 CFR 1026.22). The calculator applies that definition in four steps:

1. It computes the monthly payment on the full loan amount at the stated rate.
2. It subtracts origination and other upfront fees to get the net amount you receive — the “amount financed” on a Truth in Lending disclosure.
3. It adds any monthly fee to the payment.
4. It solves, by Newton-Raphson iteration, for the monthly rate at which the present value of those payments equals the net amount, then multiplies by 12 — the actuarial method set out in Appendix J of Regulation Z.

Worked example (press Load Example to reproduce it): a $25,000 loan over 48 months at a stated 8.5%, with a 3% origination fee and a $5 monthly service fee.

How Much a Fee Adds to APR, by Loan Term

The same fee costs more in APR terms on a shorter loan, because it is spread over fewer months. Here is $25,000 at a stated 8.5% with a 3% ($750) origination fee and no other charges:

This is why an advertised interest rate is not enough on its own. As the CFPB puts it, “The APR is the interest rate plus any additional fees charged by the lender” — and when you shop, “make sure you’re comparing APRs to APRs and not APRs to interest rates.”

Comparing Two Loan Offers Side by Side

Run your first offer, click Save as Offer A, then enter the second lender’s numbers and save it as Offer B. The calculator lines up both stated rates, APRs, the cash you receive, monthly outflows and finance charges. On the same term, the lower APR is the cheaper loan. Three offers on $25,000 over 48 months show how a lower rate can lose:

The offer with the lowest rate is the most expensive, and it also hands you the least cash. When the terms differ, APR is not the whole story: a 9.2% loan over 60 months costs $6,283 in interest on $25,000, against $4,210 for a 10.4% loan over 36 months, so the tool also shows each offer’s dollar finance charge and flags the difference in term.

Loan APR for Personal, Auto, and Business Loans

Different loans carry different fees. Personal loans often have an origination fee that is deducted from the proceeds. Auto loans may add documentation charges. Business loans can include packaging fees, SBA guarantee fees and monthly servicing charges. Regulation Z counts “points, loan fees, assumption fees, finder’s fees, and similar charges” and “service, transaction, activity, and carrying charges” as finance charges, but not application fees charged to all applicants or charges for an actual unanticipated late payment (12 CFR 1026.4). So enter the fees you must pay to get the loan and leave out late fees. Credit that is primarily for a business purpose is exempt from Regulation Z (12 CFR 1026.3), which means a business lender may not quote an APR at all — the case where working one out yourself is most useful.

APR vs APY (Effective Annual Rate)

APR is a nominal rate. Under the actuarial method it is the periodic (monthly) rate multiplied by the number of periods in a year, with no compounding. APY, or the effective annual rate, compounds: (1 + monthly rate)¹² − 1. The 10.528% APR in the worked example corresponds to an effective annual rate of about 11.05%. Loans are quoted as APR and savings accounts as APY, so never compare one with the other.

Average Loan Rates in 2026 (Federal Reserve G.19)

To judge whether an offer is competitive, compare it with what banks charge on average. The Federal Reserve’s G.19 consumer credit release of September 8, 2026 reports these commercial bank averages, which the Fed describes as APRs as specified by Regulation Z:

The loan figures are simple averages of each bank’s most common rate, not rates by credit score, so an individual offer can sit well above or below them.

Prepayment and the APR on Early Payoff

The APR assumes you make every scheduled payment for the full term. If you pay the loan off early, the origination fee — paid in full on day one — is spread over fewer months, so your effective rate rises. Take $25,000 over 48 months at 8.5% with a 3% origination fee: held to the end, the APR is 10.100%; paid off after 12 months, when the remaining balance is $19,520.29, the same loan works out to about 12.0% a year. A prepayment charge would add to that. Lenders must disclose whether “a charge may be imposed for paying all or part of a loan’s principal balance before the date on which the principal is due” (12 CFR 1026.18(k)). For auto loans the CFPB notes that your contract and state law decide whether a penalty applies, and that some states prohibit them for certain loans; for mortgages, a penalty typically applies only in the first three or five years.

Last updated: October 2026. Regulation Z text and Federal Reserve G.19 figures checked October 2026. Estimates for general information — your lender’s Truth in Lending disclosure is the binding figure.