What does “real APR” mean on this calculator?
"Real APR" is not a separate regulatory mortgage term. On this page, it is shorthand for a holding-period effective borrowing rate: an annualized rate derived from the amount of money effectively received at closing, scheduled mortgage payments, and the payoff balance when you expect to sell or refinance.
This can be useful when two offers have different points or lender fees and you do not expect to keep either mortgage for its entire term. It should not replace the creditor's legally required APR disclosure.
Interest rate vs. APR vs. holding-period effective rate
Why the holding period matters
Mortgage points and lender fees are concentrated near closing. If you pay substantial upfront charges and refinance or sell after only a few years, those costs are spread across a relatively short period of use. That can make the effective borrowing cost materially higher than the note rate.
If you keep the loan much longer, the same upfront costs are spread across more years and more scheduled payments. This is why a holding-period analysis can add context when evaluating points or high-fee offers.
How the calculator models your effective borrowing cost
The calculator first determines the scheduled principal-and- interest payment from the loan amount, note rate, and term. It then amortizes the mortgage through the holding period you enter and calculates the remaining balance that would need to be paid off when you exit the loan.
Initial net proceeds → monthly mortgage payments → remaining payoff balance at exit
Those borrower cash flows are solved for a monthly internal rate of return and converted into an effective annual rate. That is the custom percentage shown by the calculator.
Why this is not the same as a lender's disclosed APR
Mortgage APR disclosures are governed by federal rules that specify how the finance charge and amount financed are determined. Not every closing cost is necessarily a finance charge, and the treatment of particular fees can depend on the transaction.
This calculator instead treats the points and lender charges you enter as modeled borrowing costs and lets you choose a custom holding period. That makes it useful for scenario analysis, but it also means the result should not be presented as the official APR for a mortgage offer.
How paying fees upfront vs. financing them changes the model
When modeled charges are paid upfront, the calculator reduces the net proceeds available to the borrower while keeping the stated mortgage principal unchanged. When the charges are financed, the calculator adds them to the principal used to calculate the payment and payoff balance.
Actual lender treatment can differ, and some charges may not be financeable. Use the setting to model the economics of the quote you are evaluating rather than assuming every mortgage allows the same treatment.
What about discount points?
A discount point is generally expressed as a percentage of the loan amount. Paying points may be offered in exchange for a lower interest rate, but the rate reduction is not fixed universally. The correct comparison uses the actual rate and point combination quoted by the lender.
If your main question is whether paying points for a lower quoted rate is worthwhile, use the Mortgage Points Calculator. That calculator is specifically designed to compare a no-points rate with a points-based rate.
How to compare two mortgage offers
Compare offers using the same loan type, term, loan amount, occupancy, lock period, and expected holding period. Record the note rate, lender-disclosed APR, discount points, lender fees, and lender credits from each quote before comparing costs.
For a direct side-by-side analysis of two complete offers, use the Loan Comparison Calculator.
Frequently asked questions
Is 'real APR' an official mortgage term?
No. On this page, 'real APR' is shorthand for a custom holding-period effective borrowing rate. The lender's disclosed APR is calculated under federal disclosure rules.
Why can the effective rate be higher than the note rate?
Points and modeled lender fees increase borrowing cost. When those charges are spread across a shorter holding period, their annualized impact can be substantial.
Does this calculator include property taxes and homeowners insurance?
No. The model focuses on borrowing-related cash flows. Property taxes, homeowners insurance, HOA dues, maintenance, and other ownership costs are not included.
Why does the calculator use the remaining loan balance at exit?
If you sell or refinance before maturity, the remaining principal generally must be paid off. Including that payoff is necessary for a holding-period cash-flow calculation.
Can I use this result instead of the APR on a Loan Estimate?
No. Use the lender's official disclosures for the legally required APR and transaction-specific finance charges. This calculator is a supplemental scenario-analysis tool.
Should I use this calculator to decide whether to pay points?
It can provide context, but the Mortgage Points Calculator is better for that decision because it compares the actual no-points rate with the lower rate offered in exchange for points.
Methodology and related calculators
MortgagePaymentCalculator.io is published by Family Brands LLC. Calculator results are estimates for educational and planning purposes and are not lender disclosures, mortgage offers, approvals, or legal interpretations of Regulation Z.