Biweekly vs monthly payment calculator
This calculator answers a narrow question: on the same balance, the same rate and the same amortisation, what changes when you pay half a monthly payment every two weeks instead of one full payment a month. It runs both schedules side by side and reports how many periods each one takes.
— sooner, $0.00 less interest
An accelerated biweekly schedule takes the monthly payment, halves it, and collects 26 halves a year — the equivalent of one extra monthly payment annually. A 'biweekly' schedule at 1/26 of the monthly total is not accelerated and saves far less.
What each input means
Amount borrowed is the principal at the start of the schedule, the balance the arithmetic actually works on. If a lender fee or an insurance premium is added to the loan rather than paid up front, that amount is part of the balance and belongs in this box. If it is paid separately, it does not.
Annual interest rate is the nominal rate stated in the agreement, entered as a number rather than a decimal. It is the contract rate on the loan you are modelling. It is not a rate loanmoose.ca sets, and nothing on this page is a rate quote.
Amortisation is measured in years and describes how long the schedule takes to retire the balance at the payment size being tested. It is not the term of the agreement. A loan can carry a short term against a long amortisation, and when the term ends the remaining balance is due, renewed or refinanced.
Semi-annual compounding is a switch, not a preference. Canadian fixed-rate mortgages are compounded semi-annually by law, and the federal consumer agency explains how that convention shapes the payment a borrower is quoted. Leave it on when you are modelling a fixed-rate mortgage. Turn it off only when the product compounds differently, because many personal loans and lines of credit compound monthly or daily instead, and the same nominal rate behaves differently under those conventions.
How the arithmetic works, in words
The calculator first converts the annual rate into a rate per payment period. With semi-annual compounding it halves the annual rate to get a half-year rate, compounds that twice to produce an effective annual rate, then re-expresses that effective rate as the rate that applies to a single payment period: twelve periods a year for monthly, twenty-six for biweekly. Without semi-annual compounding it takes the simpler route of dividing the annual rate by the number of periods in the year.
It then runs two amortisation schedules. In each period it multiplies the outstanding balance by the period rate to get the interest owed, subtracts that interest from the payment, and applies whatever remains to the principal. The balance falls a little each period until it reaches zero. The number of periods that took is the answer, and the gap between the two columns is the point of the page.
The monthly column uses twelve payments a year. The accelerated biweekly column uses half of the monthly payment, paid every two weeks: twenty-six half-payments, which is the same as thirteen full monthly payments a year. That extra thirteenth payment, applied steadily to principal, is the entire mechanism. Nothing else about the loan changes.
What the result does and does not tell you
It tells you what the arithmetic does when the same balance, the same rate and the same amortisation are paid on two different calendars. It is a comparison of schedules, not a prediction about your file.
It does not tell you whether a given lender offers accelerated biweekly payments on your product, whether your payment is calculated as half the monthly payment or as the annual total divided by twenty-six, what a prepayment charge would be, or what your own balance, rate and amortisation actually are. Those come from your agreement. A lender's prepayment rules decide whether the faster schedule is permitted at all, and how much notice or charge applies when you make it.
What the arithmetic assumes
- The rate stays constant for the whole schedule. A variable-rate product breaks that assumption from the first change.
- No fees, insurance premiums, property taxes or other charges are built into the payment, and none are added partway through.
- No lump-sum prepayments, no skipped payments, no late payments and no change to the amortisation.
- Every payment is made exactly on schedule, so interest accrues for exactly one period each time.
- The compounding convention you selected applies consistently for the entire schedule.
- The borrower qualifies at the contract rate entered. Federally regulated mortgage lenders generally qualify an uninsured mortgage at the greater of the contract rate plus two percentage points and 5.25 percent, so a real approval may be tested at a higher rate than the one in the box.
loanmoose.ca is not a lender. It does not make loans, set rates or make credit decisions, and this calculator cannot approve anything. Consumer protections and complaint routes depend on who is lending and where, because lending in Canada is licensed provincially, so the disclosure rules and prepayment protections attached to your loan vary by province and territory and by the type of lender.
Frequently asked questions
Is accelerated biweekly the same as a plain biweekly payment?
No. A plain biweekly payment is usually the annual payment total divided by twenty-six, which spreads the same annual amount across more dates and leaves the total interest roughly unchanged. An accelerated biweekly payment is half the monthly payment made every two weeks, producing twenty-six half-payments that equal thirteen monthly payments a year. This calculator models the accelerated version. Which one your agreement uses is set by the lender, so check the payment clause before relying on either column.
Does paying every two weeks always reduce total interest?
Not by itself. The calendar does not change interest; paying more in a year does. If the biweekly amount is genuinely half a monthly payment, you pay one extra monthly payment each year, more of every payment reaches principal, and the balance retires sooner. If the biweekly amount is only the annual total split into twenty-six parts, the annual outlay is the same and the interest total is essentially the same. The distinction is the payment amount, not the frequency label.
Why does the calculator ask about semi-annual compounding?
Because the compounding convention changes the effective rate produced by the same nominal rate. Canadian fixed-rate mortgages are compounded semi-annually by law, while many personal loans, lines of credit and revolving products compound monthly or daily. If you enter the wrong convention, the schedule the calculator builds will not match the schedule your lender runs, and the payment figures in both columns will disagree with your statement for reasons that have nothing to do with payment frequency.
Can this calculator tell me whether I will be approved for a faster payment schedule?
No. loanmoose.ca is not a lender and does not make credit decisions, so it cannot approve a payment plan or a loan. Whether accelerated biweekly payments are available depends on the lender, the product and the terms of your agreement, and some mortgages restrict prepayment or attach a charge to it. The reliable answer comes from reading your agreement and asking your lender or servicer directly.
My rate is variable. What should I enter?
Any single number is a snapshot, because the calculator holds the rate constant for the whole schedule while a variable rate does not. You can enter the current rate to see the shape of the comparison, but the real outcome depends on every future change. The Bank of Canada publishes a policy interest rate, a prime rate, conventional mortgage rates and Government of Canada benchmark bond yields, which are benchmarks rather than offers.
Does the result include fees, insurance or prepayment charges?
No. Both schedules model principal and interest only. Fees, insurance premiums, property taxes and any prepayment charge sit outside the arithmetic, and they can be large enough to change the comparison between the two columns. Your loan agreement and its disclosure statement are where those amounts are recorded. Enter only the balance the interest is actually charged on, and treat everything else as a separate cost to check.
Other calculators
Compare loan offers
Compare options from Canadian lending partners. We are not a lender and we do not make credit decisions.
Advertising disclosure: loanmoose.ca may receive a referral fee if you continue through a partner link. That fee does not change the rate you are offered and it does not change what we publish. We are not a lender. Read the full disclosure.