Yes, a mortgage calculator can be useful for estimating what your monthly repayments might be and how much you could potentially borrow. It is only an illustration, however, because results depend on the interest rate, deposit, mortgage term, fees, income and individual lender criteria. Try different deposit sizes, terms and interest rates to see how your budget could change, and allow for council tax, insurance and household costs too. For a more reliable estimate, speak to an FCA-authorised mortgage adviser or lender, who will assess your circumstances.