Biweekly Mortgage Calculator
Paying half your mortgage every two weeks adds up to one extra payment a year. See how much time and interest that saves.
How the biweekly mortgage calculator works
This calculator shows how switching from monthly to biweekly payments quietly shortens your loan. Instead of twelve monthly payments a year, you pay half your monthly amount every two weeks. Because a year holds 52 weeks, that's 26 half-payments, which equals 13 full monthly payments rather than 12 — one extra payment every year without it feeling like much.
That additional payment lands entirely on principal, so the balance falls faster, less interest accrues, and the loan retires years ahead of schedule. The tool compares the standard monthly payoff against the biweekly path so you can see the years and interest saved side by side.
Worked example: with loan amount of $300,000, interest rate of 6.75% and loan term (years) of 30, the biweekly mortgage calculator shows interest saved with biweekly payments of $95,553.
- Monthly payment
- $1,945.79
- Biweekly payment
- $972.90
- Biweekly payoff
- 23.9 yrs
- Interest (monthly plan)
- $400,486
| Loan amount | Interest saved with biweekly payments |
|---|---|
| $200,000 | $63,702 |
| $300,000 | $95,553 |
| $450,000 | $143,329 |
| $600,000 | $191,106 |
The formula
Biweekly payment = monthly payment ÷ 2, paid every two weeks for 26 payments a year, totaling 13 monthly payments annually instead of 12. The extra full payment reduces principal directly, and the schedule is recomputed each period with interest = balance × (annual rate ÷ 12) on the monthly equivalent.
- Assumes the servicer applies each half-payment toward the balance on a true biweekly cycle rather than holding both halves until month-end.
- The savings come entirely from the 13th payment; a plan that just banks your halves and pays monthly delivers no acceleration.
- Assumes a fixed rate and no prepayment penalty — verify both, since a penalty can erode the benefit of paying ahead.
- Some lenders charge enrollment or per-payment fees for formal biweekly programs; those costs offset part of the interest saved.
- You can replicate the effect for free by paying one-twelfth extra each month — confirm whether your servicer credits that to principal immediately.
Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender or a licensed advisor.
Questions about the biweekly mortgage calculator
Why does paying biweekly save so much when the yearly total is barely higher?
The leverage is in timing and target. Twenty-six half-payments equal thirteen monthly payments, so you make one extra payment a year, and that whole payment hits principal.
Cutting the balance early stops interest from accruing on it for every remaining month, and on a 30-year loan that compounding effect removes years and tens of thousands in interest.
Should I pay my lender's biweekly fee or set it up myself?
Usually set it up yourself. The acceleration comes from one extra payment a year, which you can achieve free by adding one-twelfth of your payment to each monthly check, earmarked for principal.
Paid biweekly programs charge enrollment or transaction fees for the same result. Only use the lender's program if it's genuinely free and applies halves promptly.
Does a biweekly schedule line up with how I get paid?
Often, and that's part of the appeal. If you're paid every two weeks, biweekly mortgage payments sync naturally with your paychecks, and two months a year you'll have three pay periods to cover two half-payments.
That rhythm makes the extra annual payment feel painless rather than like a budget event you have to plan around.
Is the Biweekly Mortgage Calculator free to use?
Yes. Every calculator on MortgageLoansCalculator is completely free, with no sign-up, login or paywall. Run as many scenarios as you like.
How do biweekly mortgage payments work?
You pay half your monthly payment every two weeks, which comes to 26 half-payments a year — the equivalent of 13 monthly payments instead of 12. That one extra payment goes to principal, shortening the loan and cutting total interest.
How much do biweekly payments save?
On a typical 30-year loan, a biweekly schedule can shave roughly four to six years off the term and save tens of thousands in interest, depending on your rate and balance. The calculator above shows your exact savings and payoff date.
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