Calculate the amount of grout needed for tiling based on tile size, spacing, and area.
This grout calculator estimates how much tile grout you need to fill the joints between tiles, based on tile size, thickness, joint width and area. It returns the grout weight so you know how many bags to buy – for wall or floor tiling, in metric or imperial.
| Factor | Effect on grout |
|---|---|
| Smaller tiles | More joints → more grout |
| Thicker tiles | Deeper joints → more grout |
| Wider joints | More grout |
Mosaic and small tiles use far more grout per m² than large-format tiles because there are many more joints. That's why entering the real tile size matters – a 600×600 mm floor uses only a fraction of the grout a 100×100 mm floor needs over the same area.
For wall tiles, 2–3 mm is standard. For floor tiles, 3–5 mm. Large format tiles (600 mm+) can use 2 mm joints with rectified edges.
Initial set is 24–48 hours. Full cure takes 7–28 days depending on the product and conditions.
Sanded grout is for joints wider than 3 mm (1/8 in) – it is stronger and shrinks less. Unsanded grout is smoother and better for narrow joints and polished tile.
Grout depends on tile size, joint width and tile thickness. The calculator combines these to estimate the kilograms of grout for your area.
Cement-based grout benefits from sealing in wet areas like showers and floors to resist staining and water. Epoxy grout is already waterproof and does not need sealing.
