This free Buy To Let (BTL) return on investment (ROI) automated calculator is what we use to analyse investment properties to determine the total cost of the purchase and the monthly or yearly profit to determin the ROI %. You should be calculating the ROI on any property that you are thinking about investing in. This tool will save you from investing blind, avoiding poor investments and only taking the best ones. Best of all, it's free and will be sent to your email address instantly. Enjoy!