Bi-Weekly Mortgage Payment Calculator
Interest and years saved by paying half the mortgage every two weeks, the extra-payment version, the free monthly equivalent (1/12 extra principal) and the effect of lender fees — any currency.
| Monthly payment / bi-weekly payment | — |
|---|---|
| Paid per year | — |
| Monthly schedule | — |
| Bi-weekly schedule | — |
| Time saved | — |
| With the extra amount | — |
| DIY equivalent (monthly + 1/12 extra principal) | — |
| Net of fees | — |
In short
Paying half the monthly mortgage every two weeks makes 26 half-payments — 13 monthly payments a year — and the extra one goes to principal. On 300,000 at 6.5% over 30 years, bi-weekly payments of 948 clear the loan in about 24 years and save roughly 88,000 of interest; paying 1/12 extra principal each month achieves the same without any lender fee.
Who this is for: Mortgage borrowers considering bi-weekly or extra-principal payments.
Why bi-weekly payments shorten a mortgage
- A year has 52 weeks, so paying half the monthly amount every two weeks means 26 payments — the equivalent of 13 monthly payments. The extra one reduces principal directly.
- On a 30-year loan at 6–7% that typically removes 4–5 years and saves 15–20% of the total interest.
- Timing bonus: if the lender credits each half-payment when received, interest is also charged on a slightly lower average balance — a small additional saving.
- Beware fees: third-party programmes may charge setup and per-transaction fees and some simply hold your money until the normal due date, delivering nothing you could not do yourself.
- DIY: add 1/12 of the payment as extra principal each month — identical saving, no fee, fully flexible. Check there is no prepayment penalty (UK fixed deals usually allow 10% a year).
See also: Amortization Schedule Calculator, Mortgage Payment Calculator (PITI).
Assumptions
- Monthly payment from the amortising formula; bi-weekly = half, applied every 14 days at rate ÷ 26.
- DIY equivalent = monthly payment + 1/12 extra principal each month.
- Time saved = monthly months − bi-weekly months (periods × 14 ÷ 30.44).
Worked example
Monthly payment 1,896 → bi-weekly 948. Monthly: 30 years, about 382,600 interest. Bi-weekly: about 24 years 1 month (628 payments) and 294,500 interest — saves about 88,100 and almost 6 years. Paying 2,054 monthly (1/12 extra principal) clears it in 24 years 2 months with 295,400 interest — within about 900 of the bi-weekly result. Adding 50 to each bi-weekly payment ends the loan in about 21½ years.
Frequently asked questions
Does paying bi-weekly really save money?
Yes — because you make one extra monthly payment a year, not because of the schedule itself. The calculator shows the saving and the free monthly equivalent.
Will my bank let me pay bi-weekly?
Many will; others accept extra principal with the monthly payment, which gives the same result. Confirm there is no prepayment penalty.
What is the difference between bi-weekly and semi-monthly?
Bi-weekly is every two weeks (26 payments); semi-monthly is twice a month (24 payments) and produces no extra payment, so it saves almost nothing.
Does this work for UAE or Pakistan mortgages?
Yes for reducing-balance loans with free partial prepayment; UAE banks typically allow overpayments with a small fee, so compare that fee with the saving.
How much faster is a 30-year mortgage paid bi-weekly?
About 5–6 years faster at 6–7% rates, saving 20–25% of the interest.
Can I stop bi-weekly payments?
A lender programme may need notice; the DIY version — extra principal with the monthly payment — can stop any month.
Related calculators
Found an error? Report it — tell us the inputs, the result you got, what you expected and the rule or source. Confirmed corrections are published within a week.
Ready to build your next digital solution?
Send the brief and you get a scoped response with approach, milestones and a fixed price range. Not a sales call.
A 30-minute call with the engineer who would run your project
Within 2 business daysA written scope: approach, module breakdown, milestones, fixed price range
Within 5 business daysYou decide. No retainer, no obligation, and the scope document is yours to keep either way
Your timelineSend your brief
Three fields to start. Add project details if you have them.