Biweekly Mortgage Calculator

Estimate interest and payoff-time differences using a consistent periodic-rate conversion rather than assuming 13 payments with no timing effect.

Mortgage principal

APR (%)

Term (years)

—Standard monthly payment

—Biweekly half-payment

—Estimated interest saved

—Estimated years saved

—Estimated accelerated payoff

Biweekly simulation converts the monthly-compounded annual rate to an equivalent 26-period rate, then applies half the regular monthly payment every two weeks. Servicer posting rules can differ.

How to use this Biweekly Mortgage Calculator

Estimate interest and payoff-time differences using a consistent periodic-rate conversion rather than assuming 13 payments with no timing effect.

Practical tips and limits

Change the assumptions to match the scenario you want to model. Results are browser-local estimates and are not lender, landlord, tax, legal, or investment advice. Real contracts can use different timing, fees, eligibility rules, and rate conventions.