Calculator Cost of Borrowing
See the true cost of your mortgage: total interest paid, effective annual rate, cost per dollar borrowed, and how a 1% rate change impacts your bottom line. Uses Canadian semi-annual compounding.
Cost of Borrowing Calculator
See the true cost of your mortgage: total interest paid, effective annual rate, cost per dollar borrowed, and how a 1% rate change impacts your bottom line. Uses Canadian semi-annual compounding.
Monthly Payment
$2,767
Total Amount Paid
$830,209
Total Interest Paid
$330,209
Effective Annual Rate
4.6%
Cost Per Dollar Borrowed
1.66
Interest as % of Total
39.8%
Interest at Rate -1%
$248,905
Interest at Rate +1%
$415,587
Calculation uses Canadian semi-annual compounding per the Bank Act. Actual costs may vary with prepayments, rate changes at renewal, and lender fees.
All calculations use Canadian semi-annual compounding per the Bank Act. These results are estimates for educational purposes only and do not constitute financial advice. Speak with a licensed mortgage broker for advice specific to your situation.
API Access for Developers & AI Agents
This calculator is available as a free JSON API. AI agents, chatbots, and developers can send mortgage data and get instant results.
POST /api/calculate/cost-of-borrowing
{
"principal": 500000,
"annualRate": 4.5,
"amortizationYears": 25
}
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