— Calculator

What will this house actually cost?

Monthly payment is the headline. Lifetime interest is the real story. Enter your loan and see how each rate and term combination reshapes both, plus what a single point of rate drift costs over thirty years.

— Inputs

Your loan

Term

Assumes fixed rate, no PMI or taxes, principal + interest only

— Your payment

$400,000 borrowed · 6.75% · 30 yr

$2,594.39/ month

Where every dollar goes

42.8% principal · 57.2% interest

Principal
Interest

Total paid

$933,981

over 360 payments

Total interest

$533,981

57.2% of payments

Paydown

$400,000

principal repaid

— What a 1% rate change costs you

A single extra point adds $271 a month, and $97,652 more in interest over 30 years.

Mortgage rates move with the 10-year Treasury, which tracks the Fed's path loosely. A quarter-point move at the FOMC doesn't always show up as a quarter-point in mortgage rates. A full point of drift over a year is common, and the lifetime impact compounds fast.

— Scenario grid

Same loan, different rates and terms

Your current pick is highlighted. Every other cell shows the monthly P&I if you moved either knob.

Rate15 yr20 yr30 yr
5.75%$3,322$2,808$2,334
6.25%$3,430$2,924$2,463
6.75%$3,540$3,041$2,594
7.25%$3,651$3,162$2,729
7.75%$3,765$3,284$2,866

— FAQ

Mortgages, answered.

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