Bi-Weekly Mortgage Payoff Calculator
Compare a normal monthly mortgage to a bi-weekly half payment plan and see the years and interest you save.
Time saved with bi-weekly payments
0 years
Runs entirely in your browser. Nothing you enter is uploaded.
How to use this tool
- Enter your loan amount, which is the home price minus your down payment.
- Enter the annual interest rate and the original term in years.
- Click Compare plans to see the standard monthly schedule next to the bi-weekly half payment plan, with the years and interest you slice off.
This is an educational estimate of principal and interest only, not financial advice. Property tax, insurance, and lender rules can change the real result.
How the bi-weekly plan works
On a normal mortgage you make one full payment each month, which is 12 payments a year. With an accelerated half payment plan you pay half of the monthly amount every two weeks. Because there are 52 weeks in a year, that is 26 half payments, which equals 13 full monthly payments instead of 12. That one extra annual mortgage payment goes straight at the principal, so the balance falls faster and less interest builds up.
The calculator amortizes both plans month by month. Each month interest is charged on the remaining balance, and whatever is left of the payment reduces the principal. The bi-weekly plan simply applies the equivalent of 13 monthly payments per year, so the loan clears years early.
A real example
Take a 350,000 dollar loan at 6.5 percent over 30 years. The standard monthly payment is about 2,212 dollars, and over the full term you pay roughly 446,000 dollars in interest. Switch to the bi-weekly plan, paying about 1,106 dollars every two weeks, and the loan is gone in roughly 24 years and 2 months instead of 30. That is close to six years sooner and around 100,000 dollars less interest, just from one extra payment a year.
Common questions
How does paying half every two weeks slice years off a mortgage?
Two weeks fit into a year 26 times, so 26 half payments add up to 13 full monthly payments rather than 12. That extra annual mortgage payment attacks the principal directly, shrinking the balance and the interest that grows on it, which pays the loan off years early.
Can I get the same result without a formal bi-weekly program?
Yes. The math is identical if you divide your monthly payment by 12 and add that amount to every monthly payment, or make one extra full payment each year toward principal. Many people prefer this because it avoids setup fees that some lenders charge for an official bi-weekly plan.
Will every lender apply the extra money to principal?
Not automatically. Some lenders hold half payments until a full payment is due, which removes the benefit. Confirm that extra funds are applied to principal right away, and watch for prepayment penalties before you start.
Does this include taxes, insurance, or PMI?
No. The calculator covers principal and interest only. Property tax, homeowners insurance, HOA dues, and mortgage insurance are extra and vary by location, so your real payment will be higher.
Is the bi-weekly approach always worth it?
It saves interest and shortens the loan, but the money is locked into your house. If you carry higher-interest debt or have no emergency fund, those usually come first. This tool is for educational planning, not professional financial advice.