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Biweekly Mortgage Calculator

A true biweekly simulation — a half-payment every 14 days with daily interest accrual — showing exact years shaved, interest saved, payoff date, and whether investing the difference beats it.

Instant results Private — runs in your browser Updated October 2026

USALive

Refreshed daily from Freddie Mac PMMS (weekly survey) · data as of October 15, 2026

30yr Fixed
7.40%
15yr Fixed
6.71%

UKUpdated monthly

Updated monthly from Bank of England (IADB) · latest data September 30, 2026

BoE Bank Rate3.75%

2yr Fixed (75% LTV)
5.13%
5yr Fixed (75% LTV)
4.98%
Standard Variable
6.58%

Euro areaUpdated monthly

Updated monthly from ECB Data Portal · latest data August 2026

ECB Deposit Rate2.50%

Avg new home loan (ECB MIR)
3.60%
12M Euribor (2026-09 avg)
3.25%

AUSUpdated monthly

Updated monthly from Reserve Bank of Australia (F5/F1.1) · latest data September 30, 2026

Standard Variable
8.77%
Discounted Variable
6.80%
3yr Fixed
7.02%

CANReference

Reference figure (hand-reviewed June 2026) — not auto-fetched

BoC Rate2.75%

5yr Fixed
5.54%
Variable
5.95%

Rates shown are national averages for reference only. Actual rates vary by lender, credit score, and LTV. US 30/15-yr figures come from the Freddie Mac PMMS public dataset. UK (Bank of England), Euro area (ECB) and Australia (RBA) figures come from official statistics that publish monthly, so they lag by several weeks; each card shows its own latest period. If a source can't be reached, the card keeps the last figures it fetched successfully. Canada is a reference figure only. Countries without one credible national benchmark (e.g. India, where lender rates span roughly 7%–12%+) are intentionally not shown.

Inputs

Loan amount

Interest rate

Loan term (years)

Extra per biweekly payment (optional)

Compare vs investing

Investment return (if you invest instead)

Interest saved with biweekly

$104,541.96

Paid off 6.2 years earlier — 620 biweekly payments total

Monthly payment

$2,075.51

Biweekly payment

$1,037.76

Standard payoff

30.0 yrs

Biweekly payoff

23.8 yrs

Standard total interest

$427,185.01

Biweekly total interest

$322,643.05

Estimated payoff date

Jul 2050

Biweekly vs invest — Investing wins

Biweekly saves $104,541.96 in interest. Investing the same ~$172.96/mo at 7% would grow to $211,005.56 (net gain $148,740.15). Difference: $44,198.19.

How it works

Standard schedule: monthly P&I amortization at your rate for the full term.

Biweekly schedule: a payment of half the monthly P&I (plus optional extra) every 14 days, with daily interest accrual at rate/365 between payments. That produces 26 payments per year instead of 24 — one extra full payment straight to principal.

Opportunity cost: the ~1 extra payment/year equals about monthly/12 per month. We invest that same cash flow at your assumed return and compare growth against the interest saved.

Frequently asked questions

How does biweekly actually work?

You pay half your monthly amount every 14 days. Since a year has 26 fortnights (not 24), you make 26 half-payments = 13 full payments per year — one extra applied directly to principal.

Is this a real biweekly simulation?

Yes. We accrue daily interest at rate/365 between each 14-day payment and apply the payment on that exact day — not the '1/12 extra per month' approximation many calculators use.

Do all lenders support biweekly?

Most do, but some charge a setup fee ($200–$400) or hold funds until a full monthly payment accumulates. Read the fine print, or DIY by adding 1/12 of your payment as extra principal each month.

Should I choose biweekly or just invest the difference?

Compare your after-tax mortgage rate to your expected after-tax investment return. The verdict box above runs that math on your inputs.

Does biweekly affect my credit or taxes?

No credit impact. Mortgage interest is still deductible if you itemize — you'll just have less of it to deduct.