Biweekly Mortgage Savings Calculator
See how biweekly payments shorten your mortgage.
All calculations happen locally in your browser — nothing is uploaded, stored or tracked.
Enter loan amount, rate, term
Your mortgage details.
Calculate
The two plans are simulated side by side.
Read the savings
Years cut and interest saved.
What Is a Biweekly Mortgage?
A biweekly plan splits your monthly payment in half and pays every two weeks. Since there are 26 two-week periods in a year, you make the equivalent of 13 full payments per year instead of 12 — one extra payment annually, applied to principal.
The calculator compares standard monthly payments with the biweekly plan: the same total per month budgeted, but a dramatically shorter term and lower total interest.
The Math
The simulation applies the half-payment every two weeks, with interest accruing accordingly. The extra 13th payment each year is what accelerates the payoff.
Your data never leaves your device.
Every calculation on this site runs in your browser using vanilla JavaScript. Nothing is uploaded, stored or tracked.
- 100% local, client-side calculations
- No data stored on any server
- No tracking, no analytics, no ads scripts
- Works offline once loaded
Frequently Asked Questions
How does biweekly payment work?
You pay half your monthly payment every two weeks — 26 half-payments a year equals 13 full payments, one more than the standard 12.
How much does biweekly save?
On a $300k, 6.5%, 30-year loan it typically saves 4–5 years and over $60,000 in interest.
Is biweekly the same as an extra monthly payment?
Almost — biweekly also accelerates every payment by ~2 weeks, shaving a little more interest than a simple 13th payment.
Do all lenders offer biweekly plans?
Not all, and some charge fees. You can also achieve the same effect by simply paying 1/12 extra each month yourself.
Does it work for any loan?
The principle applies to any amortized loan — the calculator works for any amount, rate and term.