Tile Grout
Calculate tile grout consumption
⬛Calculator
📐 How We Calculate
The tile grout calculator uses the following formula:
Standard Joint: Typical grout joint width is 2-5mm depending on tile size.
Grout Density: Average grout density is 1700 kg/m³.
About this tile grout calculator
This tile grout calculator estimates how many kilograms of grout you need to fill the joints between tiles. The amount depends on the tile size, the joint width and the tile thickness: smaller tiles and wider joints mean more grout per square metre. Enter the tiled area and tile size and the tool works out consumption per m² and the total grout for the job.
It works for floor and wall tiles, mosaics and large-format porcelain. For mixed tile sizes, calculate each area separately and add the results.
🧮 Calculation Example
For 20 m² of 600 × 600 mm tiles, 8 mm thick, with 3 mm joints:
- Consumption ≈ 1.6 × 3 × 8 × (1/600 + 1/600) ≈ 0.13 kg/m²
- Total grout = 20 × 0.13 ≈ 2.6 kg
Small mosaic tiles with the same joints can need several times more grout per m².
💡 Practical tips
- Round up to whole bags and keep a little spare for touch-ups.
- Use a flexible or epoxy grout for floors, wet rooms and underfloor heating.
- Mix only what you can use before the grout starts to set.
- Wider joints look better with sanded grout; very fine joints suit unsanded grout.
❓ Frequently Asked Questions
It depends on tile size and joint width. Large tiles with thin joints can use under 0.2 kg/m², while small mosaics with wide joints can use well over 1 kg/m².
Typical joints are 2–3 mm for wall tiles and 3–5 mm for floor tiles. Wider joints use more grout, so match the width to your tile and layout.
Smaller tiles have more joints in the same area, so there is more total joint length to fill, increasing grout consumption per m².
Yes — round up to the nearest bag and keep a small amount spare. It is hard to match grout colour exactly if you run short partway through.