Mortgage Calculators

Biweekly Mortgage Payment Calculator for an Existing Mortgage

Already have a mortgage? Switching to biweekly payments adds one extra payment a year. See the interest and time it saves on your remaining balance.

Inputs

Current balance

Interest rate

Years remaining

Estimates only. Change any value to recalculate instantly.

Interest saved with biweekly $48,376 paid off 4.2 years sooner

Monthly payment $1,620.50

Biweekly payment $810.25

New payoff 20.8 yrs

Interest (monthly plan) $246,149

Interest saved

Biweekly interest $198k
Saved $48k

Loan balance Balance (biweekly)

On your remaining $240,000 balance, biweekly payments save $48,376 and 4.2 years. Confirm your servicer applies the half-payments immediately — some hold them, which removes the benefit.

Biweekly payoff by yearView table

Year	Paid	Interest	Balance
1	$21,066	$15,426	$234,359
2	$21,066	$15,047	$228,340
3	$21,066	$14,644	$221,917
4	$21,066	$14,213	$215,064
5	$21,066	$13,753	$207,750
6	$21,066	$13,263	$199,947
7	$21,066	$12,739	$191,619
8	$21,066	$12,181	$182,734
9	$21,066	$11,585	$173,252
10	$21,066	$10,949	$163,134
11	$21,066	$10,270	$152,338
12	$21,066	$9,546	$140,817
13	$21,066	$8,773	$128,524
14	$21,066	$7,949	$115,406
15	$21,066	$7,069	$101,409
16	$21,066	$6,130	$86,472
17	$21,066	$5,128	$70,534
18	$21,066	$4,059	$53,527
19	$21,066	$2,919	$35,379
20	$21,066	$1,701	$16,014
21	$16,444	$430	$0

How this calculator works

This calculator runs entirely in your browser — nothing you enter is sent anywhere, and there is no sign-up. Change any input and the result, breakdown, and schedule update instantly.

Rate and cost fields are pre-filled with current benchmarks (Federal Reserve / Freddie Mac via FRED (St. Louis Fed)), so your first result is already realistic — replace them with your own quote to see your numbers. To weigh one option against another, use the loan comparison calculator.

30-year fixed mortgage rate, 2019–2026

Source: Freddie Mac PMMS via FRED. Annual averages; latest weekly reading shown.

Common questions

Is this calculator free, and do I need to sign up?

Yes and no — it is completely free and asks for no account or personal details. Every calculation happens in your browser, so nothing you type is stored or sent to us.

How accurate are the results?

The math is exact for the inputs you give it, but the defaults are national benchmarks — your real rate, fees, taxes, and insurance will differ. Treat the result as a close estimate to refine with a real quote.