APR Calculator

Estimate installment-loan APR from loan amount, nominal annual rate, term, and optional upfront fees — plus monthly payment, interest, and total cost. Everything runs in the browser.

Payment + APR
Fees → net proceeds
Stays on your device

An APR calculator (also searched as a loan APR calculator or annual percentage rate calculator) answers a practical question: after fees, what yearly rate makes the payment stream match what you actually receive? Enter the principal, the stated nominal rate, and the term in years and months.

The monthly payment is amortized from the full loan amount at the nominal rate. Optional points or closing costs reduce net proceeds. APR is solved as the internal rate that equates those proceeds to the payments, then multiplied by 12. With zero fees, estimated APR matches the nominal rate.

Results are educational estimates, not a lender disclosure or credit offer. Which fees enter official APR, and how lenders round, can differ. Totals never leave the device, and there is no account.

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How to use the APR calculator

Enter the loan amount (principal before upfront fees).
Enter the nominal annual interest rate as a percent.
Enter the term in years and months (or months only).
Optionally add upfront fees, points, or closing costs.
Read the monthly payment, estimated APR, total payments, interest, and total cost including fees.

Frequently asked questions

What is an APR calculator?

An APR calculator estimates the annual percentage rate on a fixed installment loan. You enter the loan amount, nominal interest rate, term, and optional upfront fees. The page shows the monthly payment, an APR-style estimate, total payments, total interest, and total cost including fees.

How is APR different from the nominal interest rate?

The nominal rate is the stated annual interest used to set the payment schedule. APR annualizes the cost of borrowing when upfront fees reduce what you effectively receive. With no fees, estimated APR matches the nominal rate. With fees, APR is usually higher.

How does this loan APR calculator treat fees?

Upfront fees, points, or closing costs reduce net proceeds (loan amount minus fees). The monthly payment is still amortized from the full loan amount at the nominal rate. APR is the internal rate that equates those net proceeds to the payment stream — a common educational Truth-in-Lending-style model.

How do you calculate monthly payment from the nominal rate?

The payment uses standard amortization: for principal P, monthly rate r = nominal%/12/100, and n months, payment = P × r × (1+r)^n / ((1+r)^n − 1). At 0% interest, payment is simply P / n.

What is annual percentage rate on an installment loan?

Annual percentage rate (APR) expresses the yearly cost of credit. For a fixed installment loan, it is often found by solving for the interest rate that makes the present value of scheduled payments equal the amount financed after certain fees, then annualizing that rate.

Does this APR calculator upload my loan numbers?

No. Loan amount, rate, term, and fees are calculated in your browser. Nothing is sent to a server or stored on our side.

Is this APR calculator legal or lending advice?

No. Results are an educational estimate from the numbers you enter. Lender disclosures, compounding conventions, which fees enter APR, and product rules can differ. Check official loan documents or a qualified advisor for your situation.

Can I enter term in years and months?

Yes. Use years plus extra months, or set years to 0 and enter months only — the same pattern as other finance tools on this site. Term must be at least 1 month.