Grout Calculator
Calculate kg of grout based on tile size and joint width.
The Grout Calculator is a free tool designed for construction professionals and enthusiasts. Calculate kg of grout based on tile size and joint width. Instantly get the required materials broken down by purchase units, with an option to add a wastage allowance so you never run short on site.
Inputs
Result
Result
How to Use This Calculator
- Measure the length and width of the surface to be tiled in meters.
- Select or enter the tile/piece size.
- Enter the grout joint width (typical: 2–5 mm indoors, 5–10 mm outdoors).
- Add wastage: 10 % for diagonal layout, 5 % for straight layout.
- Click 'Calculate' to get piece count, adhesive and grout needed.
Frequently Asked Questions
Diagonal installation creates more cuts and offcuts at the edges. 10 % is the minimum recommended; for complex patterns consider up to 15 %.
It depends on the adhesive and tile size. For small tiles (< 30 × 30 cm) use 2–4 kg/m²; for large formats (60 × 60 cm or more) you need 5–8 kg/m².
For smooth interior floors, apply a 3–5 mm layer. For exterior or uneven surfaces, up to 10 mm with tile adhesive mortar.