Mortgage Rate Difference Calculator

Enter one loan amount, term, and two rates to isolate how the rate difference changes monthly principal and interest and total modeled interest.

Loan amount

Rate A (%)

Rate B (%)

Term years

—Rate A payment

—Rate B payment

—Monthly difference

—Rate A interest

—Rate B interest

—Lifetime interest difference

—Rate difference in percentage points / basis points

Isolate the effect of two mortgage rates

Hold loan amount and term constant, enter Rate A and Rate B, and compare monthly P&I and modeled lifetime interest. The result also shows the rate gap in percentage points and basis points.

Rate alone is not total loan cost

Points, credits, lender fees, mortgage insurance, and other costs can make a lower note rate more expensive overall. Use the Mortgage Comparison or Mortgage APR calculator when fees differ.