How interest rates affect buying a home? Higher interest rates make loans and mortgages more expensive. Mortgage affordability calculator will help you to find out how much yours buying power will be affected with raising interest rates.How to use:1) adjust the APR (annual percentage rate).2) adjust mortgage terms3) type-in the mortgage amountThe mortgage calculator will automatically calculate your monthly payment amount.The next section used to calculate affordability changes. It assumes the same monthly payment and the same mortgage term, only APR changes.4) modify APR on the 2nd section5) observe at the bottom yellow box the increase or reduction of your buying power