A mortgage calculator is one of the most important financial tools for any Canadian considering a home purchase. With home prices remaining elevated across Ontario and major Canadian cities in 2026, understanding exactly what your mortgage will cost each month is essential before making any offer. How Canadian Mortgages Work: A mortgage is a loan secured against your property, repaid in regular blended payments that cover both interest and principal. In Canada, mortgages are typically amortized over 25 to 30 years but renewed at fixed terms of 1 to 5 years. At each renewal, the interest rate is renegotiated based on prevailing market conditions, creating the risk of payment shock when renewing a low-rate mortgage into a higher-rate environment. Canadian Mortgage Types Explained: Fixed-rate mortgages lock your interest rate for the term, providing payment certainty regardless of Bank of Canada rate movements. Variable-rate mortgages fluctuate with the prime rate, offering potential savings when rates fall and additional cost when they rise. The Impact of Amortization Period on Total Cost: A longer amortization period reduces your monthly payment but dramatically increases total interest paid. A $500,000 mortgage at 5.5% amortized over 25 years costs $3,069 per month and $420,700 in total interest. Extending amortization to 30 years reduces the payment to $2,802 but increases total interest to $508,720 — an extra $88,000 for the longer period. Choosing the Right Payment Frequency: Accelerated weekly and accelerated bi-weekly payments result in one extra monthly equivalent payment per year that can shave 3 to 5 years off a 25-year amortization and save tens of thousands in interest. This calculator handles both fixed and variable rate scenarios and shows the impact of different amortization periods, helping Canadians make informed decisions. Always get a pre-approval from a Canadian lender before beginning your home search to understand your exact qualifying amount and lock in a rate for up to 120 days. Use this calculator alongside the mortgage stress test calculator to understand both your theoretical maximum mortgage and the actual monthly cash flow impact. Canadian mortgage brokers can often access better rates than going directly to your bank, and comparing 3 to 5 lender offers through a licensed broker costs nothing and typically takes less than one business day to obtain multiple competitive quotes. Compare mortgage amortization scenarios side by side to find the balance between monthly affordability and total lifetime interest cost that works best for your Ontario household budget and financial goals.