What Is APR, and Why Isn't It the Same as the Interest Rate?

The interest rate is just the cost of borrowing the principal. The Annual Percentage Rate (APR) rolls in mandatory fees — origination charges, processing fees, points — on top of that rate, expressed as a single yearly percentage. The CFPB requires lenders to disclose APR specifically so borrowers can compare loans on equal footing, regardless of how each lender structures their fees.

How APR Is Calculated

Because fees reduce what you actually receive without reducing your required payments, the APR is always equal to or higher than the stated interest rate whenever fees are present.

How to Use This Calculator

Enter the loan amount, the stated interest rate the lender quoted, the term in months, and any upfront fees charged at closing. The calculator solves numerically for the exact rate that reflects your true borrowing cost — the same approach used for real Truth-in-Lending disclosures, simplified for everyday use.

Worked Example

A $25,000 loan at a 6.5% stated rate over 60 months with $500 in fees: the monthly payment is calculated on the full $25,000, but you only receive $24,500 in net proceeds. That gap pushes the true APR above 6.5% — often by a quarter to a half percentage point, depending on the fee size relative to the loan.

Why Two Loans With the Same Rate Can Cost Differently

A lender advertising a lower rate but charging a large origination fee can end up costing more than a slightly higher rate with no fees. Comparing APRs directly — not just headline rates — is the only way to see which offer truly costs less.

Where APR Applies

• Mortgages: includes origination fees, discount points, and some closing costs
• Personal loans: includes origination fees, often deducted from your loan proceeds
• Auto loans: includes documentation and processing fees, though structures vary by lender
• Credit cards: typically equals the interest rate itself, since most cards don't charge upfront origination fees

Limitations of This Calculator

This tool models a simplified version of APR for a standard fixed-rate, fully-amortizing loan with fees deducted upfront. It doesn't account for variable-rate adjustments, prepaid interest timing nuances used in official Regulation Z disclosures, or mortgage-specific factors like mortgage insurance. For an official mortgage APR disclosure, always rely on your lender's Loan Estimate.

Where This Fits Your Bigger Picture

Once you know the real APR, compare it against alternatives using our personal loan calculator or loan comparison calculator to see the full cost side by side before committing.

Frequently Asked Questions