Tool: Biweekly mortgage calculator · Embed · All how-we-calculate pages · Questions
Purpose
Compare a standard fixed-rate monthly mortgage path with a biweekly path that pays half the monthly payment every two weeks (26 times per year). Educational only.
Monthly path
Standard amortization: monthly rate = APR/12; payment from the usual fixed-rate formula for the original term.
Biweekly path
- Biweekly payment = monthly payment ÷ 2
- Biweekly rate = APR ÷ 26
- Apply payments until balance is zero (or a period cap is hit)
- 26 half-payments ≈ one extra monthly payment per year
Savings
- Interest saved = monthly total interest − biweekly total interest
- Months saved ≈ monthly payoff months − biweekly payoff months (biweekly months from period × 14/30.437)
What we intentionally leave out
- Servicer biweekly draft fees and posting rules
- Taxes, insurance, PMI, and escrow
- Live rates and lender product features
- Prepayment penalties and recast options
Related
Last reviewed: August 9, 2026.
YMYL notice: This site is for education only. It is not financial, tax, or investment advice. Nestfigure is not a bank, credit union, broker, investment adviser, or fiduciary. Product terms, rates, and penalties vary—always read your institution’s disclosures before acting. Calculator results are mathematical estimates, not bank quotes.