Here are some easy calculations to work out how much product you will need.
Square meters:
Length x Width = M2 (measure the length of the area and multiply it by the width of the area to work out how many square meters you have)
Cubic meters of product:
M2 x Depth required = M3 of product required (take your square meters measurement and multiply it by the depth of product you require eg 75mm = 0.075, this will give you the amount of cubic meters you require.)