How do I calculate the landing distance in a landing chart with tailwind? With the following chart I can calculate the landing distance with the headwind, gross weight and altitude. The charts uses headwind component, but how can I calculate the landing distance required if an aircraft is landing with tailwind? There is this rule of 50% for headwind and 150% for tailwind but how do i apply this with this chart? 

Thanks in advance
You can’t use that chart with tailwinds - not without an expansion of the graph to include that information.  Without more information from the OEM on landing distance in a tailwind I would not risk my life on a calculation derived from that chart.