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Home, Property & Mortgages

Biweekly Mortgage Payment Calculator

See how paying half your mortgage payment every two weeks (26 payments a year) saves interest and shortens the loan.

Your inputs

Results

Interest saved vs monthly

$74,440.24

Biweekly payment
$899.33
Monthly payment
$1,798.65
Payoff time with biweekly payments
24.5 years
Biweekly payments made
638
Extra paid per year (26 halves = 13 monthly payments)
$1,798.78

✓Exact calculation — rounded only for display

Notes for this result

  • Assumes your lender applies each half-payment on receipt with interest at the annual rate ÷ 26. Some programs hold payments until a full monthly amount accumulates, which reduces the saving.

Inputs are never added to links for financial, salary or health calculators.

What this calculator does

Paying half the monthly amount every two weeks means 26 half-payments — the equivalent of 13 monthly payments — each year. The extra payment goes to principal and shortens the loan.

Formula and method

Biweekly payment = monthly payment ÷ 2; periodic rate = annual rate ÷ 26; the loan is simulated until paid off and compared with the monthly schedule.

Worked example

Calculated by this tool with its default inputs:

Inputs

  • Loan amount: 300000 (any currency)
  • Interest rate: 6 %
  • Term: 30 years

Results

  • Interest saved vs monthly: 74,440.24
  • Biweekly payment: 899.33
  • Monthly payment: 1,798.65
  • Payoff time with biweekly payments: 24.5 years
  • Biweekly payments made: 638
  • Extra paid per year (26 halves = 13 monthly payments): 1,798.78

How to read the results

Most of the saving comes from the one extra monthly payment per year; you can get a similar result by adding one-twelfth extra each month.

Assumptions and limitations

  • Some lenders hold biweekly payments until a full payment accumulates, which reduces the benefit; others charge setup fees.

Financial results are estimates based on the inputs and assumptions shown. They are not financial advice; confirm figures with your lender, provider or a qualified adviser before making decisions.

Questions

Is biweekly the same as semi-monthly?

No. Semi-monthly is 24 payments a year and does not create an extra payment.

Methodology and verification

Result type
Exact mathematical calculation (rounded only for display)
Formula version
1.0
Automated verification
3 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
Editorial review
Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.

Privacy

Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Because this calculator can involve personal financial or health details, your inputs are never added to share links or saved to history. Privacy policy