Mortgages

Mortgage APR Calculator

Calculate true Mortgage Annual Percentage Rate (APR) by factoring in lender fees, origination charges, discount points, and closing costs.

What this calculator does

The Mortgage APR Calculator estimates your result instantly from the values you enter, using standard mortgages formulas. Calculate true Mortgage Annual Percentage Rate (APR) by factoring in lender fees, origination charges, discount points, and closing costs. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate for planning rather than financial advice.

About Mortgage APR Calculator

The Mortgage APR Calculator computes the true Annual Percentage Rate (APR) on a home loan by incorporating all mandatory lender financing fees, points, and origination charges into the effective borrowing cost.

Formula & Mathematical Calculation

Net Loan Proceeds = Loan Amount - Prepaid Finance Charges

Net Loan Proceeds = Sum_{t=1}^n [ Monthly Payment_t / (1 + APR / 12)^t ]

Calculation Example

$300,000 Loan @ 6.5%: $4,500 prepaid fees → Stated Rate: 6.500% | True APR: 6.643%.

Key Benefits

  • Reveals the hidden cost of lender fees and closing points
  • Allows accurate side-by-side comparison of loan estimates from different banks
  • Differentiates between nominal interest rate and true APR
  • Prevents deceptive low-rate offers with excessive hidden closing costs
  • Complies with Truth in Lending Act (TILA) calculations

How to Use this Calculator

  1. Enter Loan Principal & Stated Rate
    Input loan amount and nominal interest rate.
  2. Itemize Prepaid Finance Fees
    Enter origination and processing fees.
  3. Calculate True APR
    Click Calculate to view effective APR.

Assumptions & Limitations

What the calculation assumes

  • Every value you enter is treated as an exact, known amount.
  • Rates and contributions are assumed to stay constant for the whole period unless the form asks for them separately.
  • Results use standard financial formulas and ignore fees, penalties and promotional terms that are not entered above.
  • Inflation, tax changes and market volatility are not modelled unless a field for them is provided.
  • Amounts are unit-agnostic: results are returned in the same currency you enter.

What it does not cover

  • Mortgage APR Calculator produces estimates for education and planning, not a quote, offer or professional advice.
  • Real-world outcomes differ when fees, taxes, rounding rules or provider-specific terms apply.
  • Local regulations and tax rules vary by country and change over time; verify current rules for your jurisdiction.
  • Figures are only as accurate as the inputs you supply — check them before acting on the result.
  • For decisions with lasting financial impact, confirm the numbers with a qualified professional.

Frequently Asked Questions

The interest rate reflects only the basic annual cost of borrowing. The Annual Percentage Rate (APR) incorporates upfront lender financing costs—including origination fees, discount points, processing fees, and mortgage insurance—annualized over the term.

Lender fees, points, underwriting charges, document prep, and mortgage insurance premiums are included. Third-party fees not paid to the lender (appraisal, home inspection, transfer taxes, title recording) are excluded.

APR spreads upfront financing fees over the contractual loan term. Spreading $5,000 in fees across 15 years yields a larger annual percentage impact than spreading that same $5,000 across 30 years, despite 15-year loans carrying lower base rates.

No. The official APR assumes you keep the mortgage for the entire 30-year term. If you refinance after 5 years, upfront fees are amortized over a much shorter window, making your effective realized borrowing cost higher than the stated APR.

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Next step: browse the full Mortgages calculators or read the related guides for context before you decide.