Mortgage Calculator — How Much Can You Afford?

http://www.cmhc.ca/en/co/buho/buho_005.cfm

The shortest answer to that question is: it depends on a number of factors. The most important are your gross household income, your down payment and the mortgage interest rate. Lenders will also consider your assets and liabilities. Your own lifestyle and debt comfort zone also come into play.

Use the Mortgage Calculator to estimate the maximum mortgage you can afford
This calculation is based on two simple rules that lenders use to determine how much of a mortgage you can afford. The first rule is that your monthly housing costs should not exceed 32% of your gross monthly household income. Housing costs include monthly mortgage payments, taxes and heating expenses. If applicable, this sum should also include half of monthly condominium fees.

Secondly, your entire monthly debt load should not be any more than 40% of your gross monthly income. This includes housing costs, and other debts such as car payments, personal loans, and credit card payments.
 

MORTGAGE QUALIFIER

http://www.cpadirectory.com/cpadirectory/calculators/java/CAMortgageQualifier.html

The first step in buying a house is determining your budget. This calculator steps you through the process of finding out how much you can borrow. Fill in the entry fields and click on the payment schedule button to see a complete amortization schedule of your mortgage payments.