Using a mortgage calculator can help you estimate monthly payments and understand how different interest rates affect your budget. It's a quick way to assess affordability and compare mortgage options. However, calculators can only provide estimates and might not account for all costs, such as insurance, taxes, or fees. Additionally, relying solely on a calculator might lead to oversights in personal circumstances that impact borrowing. For a more accurate assessment, it's advisable to consult with a mortgage adviser who can tailor advice to your situation.