Every frequency. Priced honestly.
Monthly, bi-weekly and weekly — and the accelerated versions that actually shorten your amortization, not just relabelled monthly math. Canadian semi-annual compounding throughout, with the months and dollars each schedule saves shown plainly.
Your numbers
Fixed-rate convention: interest compounds semi-annually — the Canadian standard, and the cheapest legal schedule.
Monthly payment
$3,231.56
$543,360 of interest over 30 yrs.
All five schedules, side by side
| Schedule | Payment | Paid off in | Total interest |
|---|---|---|---|
| Monthly | $3,231.56 /mo | 30 yrs | $543,360 |
| Bi-weekly | $1,489.90 /2 wks | 30 yrs | $542,125 |
| Accelerated bi-weekly | $1,615.78 /2 wks | 25 yrs 5 mo | $446,243 |
| Weekly | $744.61 /wk | 30 yrs | $541,596 |
| Accelerated weekly | $807.89 /wk | 25 yrs 4 mo | $445,304 |
Accelerated bi-weekly — half the monthly payment every two weeks — retires this mortgage 4 yrs 7 mo sooner and saves $97,117 of interest — because 26 half-payments are 13 months of payments a year, not 12.
Want to go faster still — a paid-duty shift a month straight onto the principal? Run the pay-it-faster calculator.
The rules this runs on — and how the math was verified
Payments use Canadian semi-annual compounding: the rate for any payment frequency is derived so every schedule carries the same effective annual rate. Accelerated bi-weekly is exactly half the monthly payment paid 26 times a year; accelerated weekly is a quarter paid 52 times — the extra month of payments per year is what shortens the amortization.
The engine passes 27 automated checks — effective-annual-rate identities for every frequency, a period-by-period payoff simulation for each schedule that must land within one period of the closed form, and hand-computed zero-rate cases. Arithmetic last verified August 4, 2026. It’s an illustration, not a quote or a commitment to lend.
One of the Mortgage Guru family’s 50+ free calculators — counted honestly. Wondering what you qualify for? Run your pay through the shift-income qualifier.