Mortgage Calculators Find out your potential borrowing, costs, affordability and more with our helpful mortgage calculators How much can I borrow? Find out how much you could borrow on a mortgage. What property can I afford? Find out what house price you could afford. How much stamp duty will I pay? Find out which stamp duty rates you'll pay and how much it'll cost. How much can I borrow on a Buy to Let? Find out how much rental income you'll need for your Buy to Let mortgage. First Time Buyer Stamp Duty Calculator Find out which stamp duty rates you'll pay and how much it'll cost you as a first time buyer.