roof square footage calculator

https://uniform-wiki.win/index.php/How_to_Calculate_Roof_Square_Footage_for_Accurate_Material_Estimates

I needed to figure out how much roofing material to buy for my shed, so I used a roof square footage calculator. You just measure the length and width of your roof's footprint and input the pitch, and it does the math for you, considering the slope to give you the actual surface area. It saved me from over- or under-ordering materials.