APR vs Note Rate Calculator

Calculate the true APR on any mortgage and see exactly how fees inflate your effective rate beyond the stated note rate. Compare 3 lenders by APR, find the cheapest option for your hold period, detect teaser-rate marketing tactics, and analyze ARM vs fixed APR scenarios.

APR vs Note Rate Calculator

$
%
$
True APR (Annual Percentage Rate)
6.911%
Note Rate: 6.750% · Spread: +0.161% (fees add this to your effective rate)
Note Rate
6.750%
APR
6.911%
APR Spread
+0.161%
Monthly P&I
$2,594/mo

Enter quotes from up to 3 lenders. The one with the lowest APR is the true cheapest for a 30-year hold.

Lender A
%
$
Lender B
%
$
Lender C
%
$
LenderNote RateFeesMonthly P&ITrue APR30-Year Totalvs Cheapest APR
Lender A ★ Lowest APR6.500%$8,000$2,528/mo6.695%$918,178Best
Lender B6.750%$2,500$2,594/mo6.811%$936,481+0.116%
Lender C6.625%$4,500$2,561/mo6.735%$926,548+0.040%

Compare your current loan's APR with a proposed refinance APR to determine if the refi is beneficial.

Current Loan
$
%
yrs
New Refinance Loan
%
years
$
Current Loan APR
4.500%
Existing loan (no additional fees)
New Refi APR
6.974%
Including closing costs
Monthly Payment Change
+$288
New payment vs current
Break-Even
No break-even
Time to recoup closing costs

How to Use This APR vs Note Rate Calculator

This calculator reveals the true cost of any mortgage offer by converting lender fees into an annualized rate spread.

Quick Results

Enter your Loan Amount, Note Rate (the stated interest rate on your offer), Total Upfront Fees (all fees that affect APR — origination, discount points, underwriting, processing), and Loan Term. The calculator instantly shows your true APR, the spread between APR and note rate, and flags any unusually high fee loads.

Advanced: Multi-Lender Comparison, Hold Period Impact, and Fee Categorization

The Multi-Lender APR tab compares true APR from up to 3 lenders simultaneously — enter each lender's quoted rate and fees. The Hold Period Impact tab recalculates effective APR for your actual expected hold period, since APR assumes full-term holding. The Fee Categorization tab breaks your closing costs into those that legally affect APR versus those excluded under Regulation Z.

Pro: Refinance Decision, ARM APR, and Marketing Trick Detector

The Refinance Decision tab compares your current loan's APR against a proposed refinance APR to determine the true benefit. The ARM APR vs Fixed tab shows best-case, typical, and worst-case ARM scenarios against a fixed-rate benchmark. The Marketing Trick Detector automatically identifies when a lower note rate is actually more expensive than a higher-rate loan due to excessive fees.

The APR Calculation Formula

APR solves for the rate r where:

Net Loan Proceeds = Sum [ Monthly Payment / (1 + r/12)^n ]

Net Proceeds = Loan Amount − Finance Charges

Example: $400,000 loan, 6.75% note rate, $6,500 fees, 30 years
Monthly Payment = $2,594
Net Proceeds = $393,500
APR ≈ 6.86% (fees add 0.11% to effective rate)

Example with high fees: Same loan, $16,000 in points and fees
Net Proceeds = $384,000
APR ≈ 7.05% (fees add 0.30% — red flag territory)

APR is solved numerically (Newton's method) because there is no closed-form algebraic solution. This is the same algorithm required by Regulation Z (12 CFR Part 1026). Our calculator converges to 8 decimal places of precision.

Example: Two Lenders, Same Rate — Very Different Cost

Scenario: $450,000 loan, 30 years, hold for full term

Lender ALender B
Note Rate6.75%6.75%
Origination Fee$2,250 (0.5%)$6,750 (1.5%)
Discount Points$0$4,500 (1 point)
Other Lender Fees$800$2,200
Total Fees$3,050$13,450
Monthly P&I$2,919 (same)$2,919 (same)
True APR6.79%6.97%
APR Spread+0.04% (low)+0.22% (elevated)
30-Year True Cost$1,053,880$1,063,880
Lender A Saves$10,000 vs Lender B — same note rate!

Both lenders quoted the same interest rate. The only difference was fees. Lender B's fees of $13,450 versus Lender A's $3,050 created a $10,000 cost difference that was invisible without comparing APR. This is one of the most common hidden cost traps in mortgage shopping.

Frequently Asked Questions

The interest rate (note rate) determines your monthly principal and interest payment — it is used in the standard amortization formula. APR includes the note rate plus certain upfront fees that represent the cost of obtaining the loan, all expressed as a single annualized rate. APR is always equal to or higher than the note rate. A lender with zero fees would show an APR exactly equal to the interest rate. Comparing APR across lenders gives you a true apples-to-apples comparison of total loan cost.
APR assumes you hold the loan for the full term (typically 30 years) and amortizes fees over that entire period. If you sell or refinance after 5 years, the effective rate for your actual hold is much higher than the stated APR — because you paid the full fees upfront but only held the loan briefly. A lender with higher fees but a lower rate becomes less attractive the shorter your hold. Our Hold Period Impact tab recalculates your real effective APR based on your expected timeframe.
Regulation Z (implementing the Truth in Lending Act) specifies that APR must include origination fees, discount points, mortgage broker fees, prepaid interest, and mortgage insurance premiums. Fees that are excluded include: appraisal, title insurance, title search, escrow or settlement fees, recording fees, credit report fees, and survey fees. This means APR does not capture all your closing costs — add excluded third-party fees separately when evaluating total cash needed at closing.
Advertising APR can be misleading for several reasons: (1) it is based on assumed loan amounts and ideal borrower profiles that may not match your situation; (2) lenders have discretion in classifying some fees as finance charges versus non-finance charges; (3) advertised APR often assumes 30-year holding, which inflates the benefit of low-fee, high-rate offers. Always request a Loan Estimate (LE) from any lender you are seriously considering — the LE is a standardized, legally binding disclosure that enables accurate comparison.
No — a lower note rate with a higher APR means you are paying significant upfront fees to buy the rate down. Whether this is beneficial depends entirely on how long you hold the loan. If you hold to maturity, the total interest savings from the lower rate may exceed the fee cost. If you sell or refinance sooner, the fees are sunk cost that you never recover through rate savings. The Marketing Trick Detector tab specifically identifies cases where a lower-advertised note rate is actually more expensive in APR terms.

Related Calculators

APRMortgage APR Calculator CmpMortgage Comparison PtsMortgage Points Calculator BEPoints Break-Even ARMARM Calculator RefiRefinance Calculator

Sources & References