LTV means Loan to Value. Loan to value effects the rate you receive from a lender. The lower the loan to value the better interest rates available. It is calculated by taking the amount of the mortgage, dividing it by the property value and multiplying by 100 to get a percentage. i.e. £160,000 mortgage on a property valued at £200,000 would be 80%. 160,000/200,000 x 100.