Grout Calculator
Grout fills the joints between tiles. This calculator computes the joint volume geometrically from tile dimensions, joint width and tile thickness, then converts it to weight using the product density.
Grout Calculator
Flooring & Tiling
ft²
in
in
in
in
lb/gal
%
Grout needed
6.7lb
≈ 1.9 L · 0.067 ft³
25 lb bags
1× 25 lb (11.3 kg)
10 kg bags
1× 10 kg
Calculation breakdown
- 1Joint factor:
1/0.305 + 1/0.305 = 6.49 m of joint per m² ¹ - 2Joint volume:
10.03 × 0.0032 × 0.008 × 6.49 = 1.66 L - 3With waste:
× 1.15 = 1.9 L - 4Weight:
1.9 L × density = 6.7 lb
- ¹ Joint length per square meter: one horizontal + one vertical joint set per tile pitch (L+J, W+J).
Joint length per unit area ≈ 1/(L+J) + 1/(W+J) (one horizontal and one vertical joint set per tile pitch).
Grout volume = Area × Joint width × Tile thickness × Joint length factor × (1 + Waste).
Weight = Volume × Density (unsanded/sanded grout ≈ 1.5–1.7 kg/L).