Developed by Mark Ryan, the developer of buy-to-let sourcing system Mortgage Flow, the results can be printed off or emailed for reference.

David Whittaker, managing director at Mortgages for Business said: “Savvy landlords like to do their homework before talking to a broker and the calculator will really save them time. Not only will trawling through best buy tables be a thing of the past, the calculator allows landlords to play with the variables to get an instant idea of what might be achieved with the lenders.”

He said the calculations are instant as you type, it works out minimum monthly rental requirements, shows how much you can borrow and the difference in payments between a capital and repayment and interest-only loan.