Estimate APR from a loan quote
Optional comparison offer
Include only charges you believe are APR finance charges. Appraisal, title, escrow, tax, insurance, and prepaid items may or may not be APR-included depending on the disclosure.
| Offer | Note rate | Monthly P&I | APR charges | Amount financed | Estimated APR | Horizon cost |
|---|
Horizon cost equals principal-and-interest payments through your selected horizon plus APR-included upfront finance charges. It excludes principal repayment as a cost because principal builds equity.
Methodology notes
Payment math
Monthly principal and interest use the standard fixed-rate amortization formula from loan amount, note rate, and term.
APR solve
The calculator solves the monthly rate that makes the payment stream equal the amount financed, then annualizes that rate.
Comparison view
Break-even compares extra upfront charges against monthly payment savings over your selected horizon when a second offer is entered.
This is an educational estimate, not a substitute for the official APR on a Loan Estimate or Closing Disclosure. Official APR can vary by lender fee classification, prepaid interest treatment, payment timing, and regulatory rounding. PlainFigure may earn a commission from partner links, but calculator formulas are independent. See full disclosure.
Mortgage APR FAQ
What fees belong in APR?
Common APR finance charges include discount points, origination charges, underwriting, processing, and some lender-controlled fees. Third-party and prepaid charges vary.
Should I pick the lowest APR?
Lowest APR is strongest when loan terms match and you keep the mortgage long enough. If you sell or refinance soon, lower upfront costs can still win.
Why model prepaid interest?
Prepaid interest can affect disclosed finance charges, but treatment depends on closing date and disclosure rules. Use the lender disclosure as the source of truth.