Mortgage Calculators

Biweekly Mortgage Payment Calculator for an Existing Mortgage

This calculator shows you the possible savings by starting to pay your existing mortgage with biweekly payments, instead of monthly payments.

Inputs

Current balance

Interest rate

Years remaining

Estimates only. Adjust any value to recalculate instantly.

Results

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 the biweekly mortgage payment calculator for an existing mortgage works

It computes the monthly payment on your remaining balance and term, then applies half that amount every two weeks. The 26 half-payments equal 13 monthly payments a year, so the extra goes to principal and shortens the loan.

Worked example

Worked example: with current balance of $240,000, interest rate of 6.50% and years remaining of 25, the biweekly mortgage calculator for an existing mortgage shows interest saved with biweekly of $48,376.

Monthly payment: $1,620.50
Biweekly payment: $810.25
New payoff: 20.8 yrs
Interest (monthly plan): $246,149

The formula

Biweekly payment = monthly payment ÷ 2 at the rate ÷ 26; the balance is stepped down until it reaches zero, versus the standard monthly schedule.

Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender, plan administrator or advisor.

Frequently asked

Questions about the biweekly mortgage payment calculator for an existing mortgage

Can I switch my existing mortgage to biweekly?

Yes — either through your servicer or by adding extra principal yourself. The calculator shows the interest and years you would save on your current balance.

How much will biweekly payments save me?

It depends on your balance, rate and years remaining. The extra annual payment can save years and a significant interest amount, as shown for your loan.

Is there a catch?

Only if your servicer holds the half-payments instead of applying them immediately, or charges a setup fee. You can replicate the benefit free by paying a little extra each month.

Is the Biweekly Mortgage Payment Calculator for an Existing Mortgage free to use?

Yes. Every calculator on FinCalculators is completely free, with no sign-up, login or paywall. You can run as many scenarios as you like.

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