About the Canadian Mortgage Calculator
A Canadian mortgage calculator applies the compounding rule that makes Canadian mortgages different from American ones. Under the federal Interest Act, fixed-rate mortgages must be compounded no more than semi-annually, so the same posted rate produces a slightly lower payment in Canada than it would in the US.
The formula
r_monthly = (1 + annual rate / 2)^(1/6) − 1The annual rate is halved to get the semi-annual rate, then converted to an equivalent monthly rate by taking the sixth root. That monthly rate then feeds the standard amortising payment formula.
How to use this calculator
- 1Enter your Loan Amount ($CAD). The field starts at
400000, which you can overwrite. - 2Enter your Annual Interest Rate (%). The field starts at
5.5, which you can overwrite. - 3Enter your Amortization (Years). The field starts at
25, which you can overwrite. - 4Enter your Mortgage Term (Years). The field starts at
5, which you can overwrite. - 5Read the result straight away — it recalculates as you type, so there is no button to press. Use Share to copy a link that reopens the page with your exact numbers filled in.
Worked example
| Input | Value |
|---|---|
| Loan Amount ($CAD) | 400000 |
| Annual Interest Rate (%) | 5.5 |
| Amortization (Years) | 25 |
| Mortgage Term (Years) | 5 |
Result
Monthly Payment: $2441.57 CAD
Total Interest: $332,469.779 CAD
Balance at End of Term: $356,750.001 CAD
Effective Annual Rate: 5.576%
Those are the values the page loads with, so you can reproduce this result yourself and then change one field at a time to see what drives the outcome.
Understanding your result
Semi-annual compounding means the effective annual rate is marginally below the nominal rate, unlike US mortgages compounded monthly. The difference is small on any single payment but real across a 25-year amortisation, and it is why a Canadian payment calculated with US conventions comes out slightly too high.
The other structural difference is term versus amortisation. Canadian mortgages amortise over 25 or 30 years but the rate is only committed for a term of typically five years. At renewal you take whatever rate the market offers, so the payment shown here applies to the current term rather than to the whole amortisation.
Things worth knowing
- Mortgage default insurance through CMHC or a private insurer is mandatory below a 20 percent deposit, and the premium is normally added to the balance.
- Federal stress-test rules qualify you at a higher rate than you will actually pay, so your approval amount is lower than the payment alone suggests.
- Accelerated biweekly payments are a standard Canadian option and shave years off the amortisation at little monthly cost.
- Check prepayment privileges before signing. Most lenders allow annual lump sums up to a set percentage without penalty.
- Breaking a fixed mortgage early can trigger an interest rate differential penalty that runs into thousands.
Frequently asked questions
Why do Canadian mortgages compound semi-annually?+
The federal Interest Act requires fixed-rate mortgages to state a rate compounded no more than twice a year. It slightly lowers the effective cost compared with the monthly compounding standard in the US.
What is the difference between term and amortisation?+
The amortisation is how long the loan takes to repay in full, usually 25 years. The term is how long your current rate and conditions are locked, usually five. You renew several times over one amortisation.
How much deposit do I need in Canada?+
Five percent on the first 500,000 dollars, 10 percent on the portion between 500,000 and 1.5 million, and 20 percent above that. Below 20 percent, default insurance is mandatory.
What is the mortgage stress test?+
Lenders must qualify you at the greater of the Bank of Canada benchmark rate or your contract rate plus two percentage points, which reduces how much you can borrow but protects you against renewal at a higher rate.