Finance category
Mortgage, loan, investing, tax, and money calculators.
Biweekly Mortgage Calculator
See exactly what biweekly payments save: paying half your monthly payment every two weeks adds up to one extra full payment per year. Compare months saved and total interest reduced.
Standard monthly
$2,205
30 years
Interest: $453,884
Biweekly (half every 2 weeks)
$1,103
26 payments per year
Equivalent to $2,389/mo
Savings from biweekly
$107,257
interest saved
6 years earlier payoff
How biweekly payoff works
A true biweekly schedule pays half the monthly amount every two weeks. There are 26 biweekly periods per year, which equals 13 monthly payments instead of 12 — a 13th annual payment that goes straight to principal.
You can replicate biweekly without enrolling in a service: divide your monthly payment by 12 and add it to each monthly payment. You'll get the same payoff acceleration without paying setup or per-payment fees some servicers charge.
How to Use
- Enter the loan amount, rate, and term — the calculator solves for the standard monthly payment.
- It then computes the equivalent of biweekly payments (half every two weeks = 13 monthly payments per year).
- Compare the standard payoff to the biweekly payoff to see months and interest saved.
- If your servicer doesn't offer biweekly, replicate it by adding 1/12th of the monthly payment each month.
Frequently Asked Questions
Why does biweekly save so much interest?
Twenty-six half-payments equal 13 monthly payments per year instead of 12. That extra payment goes straight to principal, which compounds in your favor — less principal each month means less interest accruing over the life of the loan.
Should I pay my servicer to set up biweekly?
Usually no. You can replicate the savings by adding 1/12th of your monthly payment each month, free. Some servicers also hold your half-payments and only credit them monthly, which doesn't actually help.
Is biweekly better than refinancing?
They solve different problems. Refinancing lowers the rate. Biweekly accelerates payoff at the same rate. If rates have dropped, refinance and consider adding biweekly on top. If rates haven't moved, biweekly is the cheaper way to save interest.
Will biweekly hurt my budget?
On most pay schedules, no — if you're paid biweekly already, splitting one mortgage payment into two halves matches your paycheck cadence. The 'extra' payment per year happens automatically because there are 26 biweekly periods, not 24.
Related Calculators
Mortgage Payoff Calculator
Model any extra-payment strategy, not just biweekly.
Mortgage Calculator
Run the base monthly mortgage payment behind the comparison.
Amortization Calculator
See how each month splits between principal and interest.
Mortgage Recast Calculator
Use a recast to lower the payment after a lump-sum principal payment.
Refinance vs Recast Calculator
Decide between replacing the loan and reshaping the existing one.
15-Year vs 30-Year Mortgage Calculator
Bigger payoff acceleration than biweekly — if cash flow allows.
More Finance Calculators
Browse all finance →AI Cost Calculator
Compare token costs across OpenAI, Anthropic, and Google AI models. Calculate monthly API spending for GPT-4o, Claude, Gemini, and more.
Tip Calculator
Calculate the perfect tip and split the bill between friends. Choose preset percentages or enter a custom tip amount.
Bill Splitter Calculator
Split an uneven restaurant bill by item, divide tax and tip proportionally, and see exactly who owes whom.
Discount Calculator
Calculate sale price, discount amount, stacked discounts, sales tax, and total savings for any markdown.
Gas Mileage Calculator
Calculate MPG or km/L, estimate trip fuel cost, and compare annual fuel expenses between two vehicles.
Sales Tax Calculator
Add sales tax to a price, reverse-calculate the pre-tax amount from a total, and estimate tax for multiple items on one receipt.
Keep exploring
Next steps in Finance
Previous calculator
Balloon Mortgage Calculator
Calculate the monthly payment, balloon payoff amount, and interest paid before the balloon comes due on a longer-amortization loan.
Next calculator
Bond Yield Calculator
Estimate annual coupon income, current yield, and approximate yield to maturity from bond price, coupon, and years to maturity.