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To calculate ‘how much house can I afford,’ a good rule of thumb is using the 28%/36% rule, which states that you shouldn’t spend more than 28% of your gross monthly income on home-related costs and 36% on total debts, including your mortgage, credit cards and other loans like auto and student loans.

If you want to do the monthly mortgage payment calculation by hand, you’ll need the monthly interest rate - just divide the annual interest rate by 12 (the number of months in a year). For example, if the annual interest rate is 4%, the monthly interest rate would be 0.33% (0.04/12 = 0.0033).

To qualify for a reverse mortgage loan you must own a home, be at least 62 years old and have enough equity built up in your home. The loan works by the lender making payments to the borrower based upon a percentage of the equity that has been built up in the home over time.

One of the best reasons to refinance is to lower the interest rate on your existing loan. Historically, the rule of thumb is that refinancing is a good idea if you can reduce your interest rate by at least 2%. However, many lenders say 1% savings is enough of an incentive to refinance.