APR Calculator

The Annual Percentage Rate (APR) is a measure of the yearly cost of borrowing that includes not just the interest rate but also the mandatory upfront fees rolled into the loan — origination fees, points, and certain closing costs. It exists to solve a real problem: a lender can advertise a low interest rate while charging high fees, making the headline rate misleading. APR puts everything on one comparable basis, which is why lenders in many countries are legally required to disclose it.

The difference between the note rate and the APR comes from those fees. When you pay, say, $600 in fees on a $20,000 loan, you're really only receiving $19,400 of usable money but making payments as though you borrowed the full $20,000. The APR is the interest rate that, applied to the amount you actually received, produces your real payment schedule. Because fees increase the effective cost, the APR is always equal to or higher than the note rate — and the gap widens with larger fees or shorter terms, since there's less time to spread the fee cost.

Calculating APR isn't a simple formula; it requires solving for the rate that makes the present value of all payments equal the net amount borrowed. This calculator does that numerically. The result is the single most useful number for comparing loan offers: a loan with a 6.8% rate and low fees can easily beat one advertised at 6.5% with heavy fees once the APR is revealed.

A few limits are worth noting. APR assumes you keep the loan for its full term; if you pay off or refinance early, fees are spread over fewer years and the effective cost is higher than the stated APR suggests. APR also doesn't capture compounding the way APY does, and different lenders may include slightly different fees, so always confirm exactly which costs are baked into a quoted APR. Used carefully, though, APR is the fairest apples-to-apples way to judge the cost of borrowing.