Grout per m² = (A + B) ÷ (A × B) × joint width × joint depth × density, with tile sizes A and B. 300 × 300 × 8 mm tiles with 3 mm joints take 0.256 kg/m²: 5.6 kg for 20 m² with 10% extra, or two 5 kg bags. Large tiles with narrow joints use far less.
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Joint length per m² = (A + B) ÷ (A × B) = (300 + 300) ÷ (300 × 300) mm = 6.667 m/m²
Grout per m² = joint length × width × depth × density = 6.667 × 3.0 mm × 8.0 mm × 1.60 = 0.256 kg/m²
Total = 0.256 × 20.0 m² × 1.10 = 5.6 kg → 2 bags
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It depends on tile size and joint width, about 0.38 kg/m² for 200 × 200 mm tiles with 3 mm joints, 0.26 kg for 300 × 300, and 0.16 kg for 600 × 600 with 3 × 10 mm joints.
How is grout quantity calculated?
Work out the joint length per m², (A + B) ÷ (A × B), then multiply by the joint width, joint depth (usually the tile thickness) and the grout density, about 1.6 kg per litre for cement grout.
Does epoxy grout use the same quantity?
The volume is the same; the weight depends on the product's density. Enter the density from the epoxy kit for an accurate weight.
