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Ontario.mortgage Calculator

Reviewed by Calculator Editorial Team

This Ontario mortgage calculator helps you estimate your monthly payments, total interest paid, and amortization schedule. It uses standard mortgage formulas to provide quick, accurate results based on your home price, down payment, interest rate, and amortization period.

How to Use This Calculator

To calculate your Ontario mortgage payments:

  1. Enter the purchase price of the home
  2. Enter your down payment amount or percentage
  3. Enter the current interest rate (fixed or variable)
  4. Select your amortization period (typically 5, 10, 15, or 25 years)
  5. Click "Calculate" to see your estimated monthly payment

The calculator will display your monthly payment, total interest paid over the loan term, and a breakdown of your amortization schedule.

Mortgage Formula

The calculator uses the standard mortgage payment formula:

M = P [i(1 + i)^n] / [(1 + i)^n - 1] Where: M = Monthly payment P = Principal loan amount (Purchase price - Down payment) i = Monthly interest rate (Annual rate / 12 / 100) n = Number of payments (Amortization period × 12)

This formula calculates the fixed monthly payment required to fully amortize the loan over the selected term.

Worked Example

Let's calculate a mortgage for a $400,000 home with a 20% down payment, 5.25% interest rate, and 25-year amortization:

  1. Down payment: $400,000 × 20% = $80,000
  2. Principal: $400,000 - $80,000 = $320,000
  3. Monthly rate: 5.25% ÷ 12 = 0.4375%
  4. Number of payments: 25 × 12 = 300
  5. Using the formula: M = $320,000 [0.004375(1.004375)^300] / [(1.004375)^300 - 1]
  6. Result: Monthly payment ≈ $2,223.45

Total interest paid over 25 years would be approximately $327,000.

Frequently Asked Questions

What is the difference between fixed and variable rates?
A fixed rate remains the same throughout the loan term, while a variable rate can change based on market conditions. Fixed rates typically offer more stability but may have higher initial rates.
How does the amortization period affect my payments?
A longer amortization period means lower monthly payments but more total interest paid. A shorter period results in higher monthly payments but less total interest.
What is the difference between principal and interest payments?
Principal payments reduce the outstanding loan balance, while interest payments cover the cost of borrowing. Early in the loan term, most payments go toward interest.