Bi-Weekly Payment Calculator
See how switching to accelerated bi-weekly payments pays your mortgage off years sooner — and how much interest it saves you.
🇨🇦 CanadaHow this bi-weekly payment calculator works
We start by computing your standard monthly payment with the usual amortization formula: payment = principal · r / (1 − (1 + r)⁻ⁿ), where r is the monthly rate (annual rate ÷ 12) and n is the amortization in months. That is the baseline most Canadian borrowers pay.
The accelerated bi-weekly payment is simply that monthly payment cut in half and paid every two weeks. Because a year holds 26 two-week periods, you end up making 13 monthly-equivalents per year instead of 12 — one full extra payment annually. That extra goes entirely to principal, which is the whole trick behind the savings.
To show the impact, this calculator runs two amortization simulations. The standard path applies the monthly rate and monthly payment until the balance reaches zero, counting the months and the total interest paid. The accelerated path applies a bi-weekly rate (annual rate ÷ 26) and the half-size payment every two weeks until the balance clears, counting the periods. Comparing the two gives your time saved and interest saved.
Use this as a planning tool. Canadian fixed mortgages are technically compounded semi-annually, but this calculator uses straightforward periodic compounding for consistency — close enough for planning the gap between monthly and accelerated bi-weekly. Confirm exact figures and payment-frequency options with a licensed Canadian mortgage professional before switching.
Bi-weekly payment questions
An accelerated bi-weekly payment is simply your monthly payment cut in half and paid every two weeks. Because there are 26 two-week periods in a year, you make the equivalent of 13 monthly payments instead of 12 — one extra payment per year. That extra payment goes straight to principal, shrinking the balance faster and cutting total interest.
A plain bi-weekly payment takes your annual payment and divides it by 26, so you pay the same total per year as monthly — no acceleration. Accelerated bi-weekly takes the monthly payment and simply halves it, which adds up to one extra monthly payment a year. This calculator models the accelerated version, which is where the savings come from.
On a typical 25-year Canadian mortgage, switching to accelerated bi-weekly payments often shaves roughly three years off the amortization and saves tens of thousands in interest, depending on your balance and rate. This calculator shows your specific time and interest saved based on the numbers you enter.
Each individual payment is exactly half your monthly payment, so it feels smaller. But because you pay 26 times a year instead of 24 (two half-payments a month), you contribute slightly more annually — the equivalent of one extra monthly payment. That modest increase is what pays the mortgage off sooner.
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