Biweekly Mortgage Calculator
Paying half your mortgage every two weeks sneaks in one extra payment a year — enough to clear a 30-year loan years early. This tool draws the biweekly and monthly payoff curves side by side so you see the gap widen, not just a single "you'll save" number.
Open the biweekly calculator →Free and instant. Enter your loan and see the exact time and interest saved.
Why every two weeks works
There are 52 weeks in a year, so paying every two weeks means 26 half-payments. Twenty-six halves equal 13 whole payments — one more than the 12 you'd make monthly. That extra payment lands entirely on principal, shrinking the balance that future interest is charged on.
- 26 biweekly half-payments = 13 monthly payments per year
- The 13th payment reduces principal directly
- Lower principal → less interest every month thereafter → faster payoff
| Loan — $320,000 at 6.5%, 30 years | $2,022.62/mo |
| Biweekly payment (half) | $1,011.31 |
| Monthly payoff | 30 yr 0 mo |
| Biweekly payoff | 24 yr 2 mo |
| Saved | 5 yr 10 mo · ~$93,000 |
Same budget, just a different rhythm — and nearly six years and $93,000 of interest gone.
Common questions
Do biweekly payments really pay off the loan faster?
Yes. 26 half-payments a year equals 13 full payments instead of 12, and that extra payment goes straight to principal — typically shaving 4–6 years off a 30-year mortgage.
Does it cost more each month?
No. Each payment is exactly half your monthly amount. The acceleration comes purely from the calendar, not a bigger budget.
Can I do it myself without a paid service?
Usually yes — pay one-twelfth extra toward principal monthly, or one extra full payment a year, for the same result. Skip third-party programs that charge fees for it.