APR, in short
APR takes your loan's upfront fees — origination charges, discount points, application costs — and spreads their effect across the loan term, expressed as a single annual percentage. It answers a more honest question than the stated rate alone: not "what rate did they quote me," but "what does this loan actually cost per year, fees included." A $250,000 loan quoted at 6.5% with $4,000 in fees carries an APR of about 6.656% — the number worth comparing across lenders, not the headline rate.
Key takeaways
- On a $250,000, 6.5% loan with $4,000 in fees ($1,000 origination + 1 point + $500 other), APR comes out to about 6.656% — 0.156 points above the stated rate.
- Zero out the fees on that same loan and APR equals 6.5% exactly, proving fees — not the rate itself — are what drive the gap between APR and the number on the loan estimate.
- Raise the fees to $9,000 (more origination cost, two points instead of one) and APR climbs to about 6.856%, a 0.356-point gap — more than double the fees produced more than double the spread.
- Two loans with the same stated rate can have different APRs if their fees differ — which is exactly the scenario APR was designed to expose.
What APR is actually measuring
The interest rate on a loan tells you the cost of borrowing the principal, nothing more. APR goes further: it treats your upfront fees as if they reduced the amount you actually walked away with, then asks what interest rate would make your actual payments equal to that smaller, "net" amount. That's why APR is always at or above the stated rate — it's capturing a real cost the rate alone leaves out.
How this calculator solves for APR
Using the calculator's defaults — $250,000 loan, 6.5% stated rate, 30 years, $1,000 origination fee, 1 discount point (1% of the loan, or $2,500), and $500 in other fees:
Total fees = $1,000 + $2,500 + $500 = $4,000
Net amount financed = $250,000 − $4,000 = $246,000
Monthly payment (at 6.5% on the full $250,000) ≈ $1,580.17
From there, the calculator solves numerically for the interest rate that makes those same $1,580.17 payments equal in present value to the smaller $246,000 net amount — that rate, annualized, is the APR: about 6.656%.
Why $0 in fees means APR equals the stated rate
Run the same $250,000, 6.5%, 30-year loan with every fee field set to zero, and the APR comes back as exactly 6.5% — identical to the stated rate. That's not a coincidence; it's the whole mechanism laid bare. APR only climbs above the stated rate because fees shrink the amount you actually received while payments stay based on the full loan amount. No fees, no gap.
How much fees actually move the number
The size of the APR-to-rate gap scales with how much you're paying in fees, not just whether you're paying them:
$4,000 in fees → APR 6.656% (+0.156 points)
$9,000 in fees → APR 6.856% (+0.356 points)
More than doubling the fees more than doubled the gap — which is exactly why a low headline rate paired with heavy fees can end up costing more than a slightly higher rate with few or no fees. APR is the number built to catch that.
APR vs. APY — not the same thing
APR and APY sound alike and get mixed up constantly, but they answer opposite questions. APR measures what borrowing costs you. APY (Annual Percentage Yield) measures what a deposit or investment earns you, and unlike APR, it accounts for compounding. Comparing a loan's APR to a savings account's APY tells you nothing useful — they're not measuring the same side of the transaction.
Related calculators
For the payment and schedule side of the same loan without the fee analysis, see the loan calculator or, for a home purchase specifically, the mortgage calculator. If you're deciding whether a lower rate is worth refinancing into, the refinance calculator weighs the new closing costs against the savings, and the interest rate calculator works the rate side of the math in isolation.