The mortgage calculator is just a guide however and before you take out any mortgage we suggest you talk to a qualified mortgage specialist. In the UK all mortgage advisors are regulated and authorised by the Financial Services Authority. Often a mortgage will come with initial set up fees or charges as well as valuation costs and sometimes even an exit fee which means you have to pay a charge to pay off your mortgage. A mortgage calculator cannot take into consideration all of these elements but a mortgage adviser could check all these elements to make sure that you are going to get the best deal.