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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