APR Calculator

An APR (Annual Percentage Rate) calculator estimates the true yearly cost of a loan once lender fees and finance charges are folded in. Unlike the headline interest rate, APR captures origination fees, discount points, and mortgage insurance — the line items that make a 6% loan actually cost 7% or more once everything is paid.

APR is a regulator-defined disclosure under the US Truth in Lending Act, which means every lender must compute it the same way. That standardization is exactly what makes APR useful: you can put two mortgage offers side by side and the lower APR really is the cheaper loan if you keep it for the full term. Most consumer lending — mortgages, auto loans, credit cards, personal loans — quotes APR by law.

Suppose you take a $10,000, 3-year personal loan at a 6% nominal interest rate with $500 in origination fees:

• Amount financed: $10,500 (loan + fees)
• Monthly payment: about $319.40
• Total paid over 36 months: about $11,498
• Excess over principal received ($10,000): $1,498
• Approximate APR: ~9.3% versus the 6% interest rate

That gap — 6% rate vs. 9.3% APR — is the whole reason the APR disclosure exists. The interest rate alone hides $500 in fees; APR exposes them as a higher annualized cost.

• Comparing mortgages — two lenders with the same rate but different fees produce different APRs; the lower one wins for long-term holds.
• Evaluating credit card offers — purchase APR, balance-transfer APR, and cash-advance APR are often three different numbers; check all three.
• Auto loan shopping — dealer financing often comes with markups; check the APR, not just the monthly payment.
• Personal loans & BNPL — fintech and buy-now-pay-later loans can have APRs above 30% even with "0% interest" marketing.
• Refinance break-even analysis — comparing your current APR to a refi APR shows whether closing costs are justified.

• Comparing APR to APY. APR is for borrowing and is not compounded. APY (for deposits) is compounded. Don't use them interchangeably.
• Ignoring how long you'll keep the loan. Low-APR loans with big upfront points only beat higher-APR loans if you hold past the breakeven point — typically 4–7 years on a mortgage.
• Forgetting that not all fees are in APR. Title insurance, recording, and inspection fees usually aren't included on a mortgage. Add them back when computing total cost.
• Looking only at monthly payment. A longer term lowers the payment but raises the total interest — and the APR comparison gets distorted across different term lengths.
• Assuming variable APR equals fixed APR. A teaser variable APR can reset much higher; check the index, margin, and rate caps.