Mortgage Calculator Guide: How to Estimate Your Monthly Payments

Planning to buy a home? Our free mortgage calculator helps you estimate your monthly house payments, calculate your interest costs, and budget for your future. Simply enter the purchase price, down payment, and loan details to see an instant breakdown of your housing costs.

If you aren't sure what numbers to plug in, use our quick guide below to understand the key factors that affect your mortgage payment.

Down Payment & Mortgage Insurance

Your down payment is the upfront cash you pay toward the purchase of your home. The minimum amount you need depends on the price of the property:

$500,000 or less: A minimum of 5% is required.
$500,000 to $999,999: 5% on the first $500,000, plus 10% on the remaining balance.
$1 million or more: A minimum 20% down payment is required.

Note on Default Insurance: If your down payment is less than 20%, mortgage default insurance is required. This premium is calculated as a percentage of your loan and is added directly onto your total principal balance, rather than being paid as a separate monthly fee.

Amortization Period vs. Mortgage Term

When entering your timelines into the calculator, it is important to know the difference between these two fields:

Amortization Period: The total number of years it will take to pay off your loan completely (typically 25 years if your down payment was less than 20%, or up to 30 years if you put down 20% or more). A longer amortization lowers your monthly payment but increases total interest.

Mortgage Term: The length of time your current interest rate and contract are locked with your lender (most commonly 3 or 5 years). When this term ends, you will renew your mortgage at current market rates.

Loan Type (Fixed-Rate vs. Variable-Rate)

Your loan type determines how your interest behaves during your chosen mortgage term:

Fixed-Rate Mortgages: Your interest rate is locked tightly for the duration of your term. Your monthly payment stays exactly the same, offering predictable budgeting and total stability.

Variable-Rate Mortgages: Your interest rate fluctuates based on the lender's prime rate. Depending on your specific mortgage structure, a rate change will either shift your monthly payment up and down, or alter how much of your fixed payment goes toward your principal versus interest.

Interest Rate

The interest rate is the cost you pay a lender to borrow the money for your home, expressed as a percentage.

Calculator Tip: This field is pre-filled with current average mortgage rates. However, your personalized rate will vary based on your credit history, your down payment size, and whether your loan is insured or uninsured.

Property Tax Rate

Property taxes are assessed annually by your local municipality to fund community services like schools, road maintenance, and emergency services.

Calculator Tip: Our tool includes an estimated property tax amount based on regional averages. You can customize this percentage under the Advanced Options tab to reflect your specific city or town's tax rate.

Homeowners Insurance

Lenders require you to have an active home insurance policy in place before closing day. This covers the cost of repairing or rebuilding your home in the event of fire, severe weather, or accidents. You can manually adjust this estimated monthly amount in our Advanced Options.

Condo or Maintenance Fees

If you are purchasing a condominium or a property within a managed development, you will pay monthly fees to a corporation to maintain common spaces, building structures, and shared amenities.

Calculator Tip: If the home you want has condo or strata fees, enter the amount directly into the calculator. Lenders factor these fees into your debt ratios when qualifying you for a loan, so it's a critical piece of your true monthly housing cost.