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you need to know: 1feet is 0.3048m wide x high = square meters how to place order:for example: you need to the wall wide=2.8m high=1.7m 2.8m x 1.7m = 4.76m2 rounding. you need to order quantity:5 wide=3.2m high=2.3m 3.2m x 2.3m = 7.36m2rounding. you need to order quantity:7 wide=4m high=2m 4m x 2m = 8m2 rounding. you need to order quantity:8