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Tiler
Grout Estimate
Grout in kg from tile size and joint.
Grout
3.1 kg
Per m20.26 kg
Formula
kg/m2 = ((L + W) / (L x W)) x joint x tile thickness x density
((300+300)/(300x300)) x 3 x 8 x 1.6 = 0.26 kg/m2
Estimate only. Add 10-15% wastage and round up to whole bags.