Biweekly Mortgage Calculator
Last updated: July 2026
Estimate payoff savings from making half-payments every two weeks.
Estimated payoff time
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- Regular monthly payment: —
- Estimated interest saved: —
On this page
Quick summary: Estimate payoff savings from making half-payments every two weeks. Enter the requested values, calculate, review the result, and compare more than one realistic scenario before making a decision.
Read the complete guide
What this calculator does
The Biweekly Mortgage Calculator compares a standard monthly mortgage schedule with a plan that makes half a monthly payment every two weeks. Because there are 26 biweekly periods in most years, this can produce the equivalent of 13 monthly payments annually.
How to use the calculator step by step
Enter the mortgage balance, rate, and remaining term. Review the standard payment and the projected payoff under the biweekly schedule, while confirming that your lender accepts additional principal payments in the way assumed.
How the calculation works
A true biweekly schedule makes 26 half-payments per year. Twenty-six halves equal 13 full monthly payments, so the extra annual principal can reduce the balance faster and lower future interest.
Worked example and scenario testing
If the normal monthly mortgage payment is 1,800, a biweekly schedule might collect 900 every two weeks. Over a full year, 26 payments total 23,400, compared with 21,600 from twelve monthly payments.
How to interpret your result
The potential savings come mainly from paying additional principal each year rather than from the word biweekly itself. Similar results may sometimes be achieved by making one additional principal payment annually.
Accuracy, assumptions, and limitations
Some lenders use payment-processing services, charge fees, hold partial payments, or apply extra payments differently. The calculator cannot reproduce every lender's servicing rules.
Common mistakes to avoid
Do not confuse paying twice per month with paying every two weeks. Twice-monthly payments produce 24 half-payments, while a biweekly schedule normally produces 26.
Privacy and browser-based calculations
Only mortgage figures are necessary. Never provide loan account numbers or lender login information.