🧱 Grout Calculator
Grout fills the joints between tiles, so the amount depends on tile size, joint width and joint depth — smaller tiles mean more joints and more grout.
1.6 L
Grout volume needed
≈ 2.6 kg
Approx. dry grout weight
Grout fills the joints between tiles, so the amount depends on tile size (smaller tiles = more joints), joint width and joint depth (about the tile thickness). Weight assumes a cementitious grout at ≈1.6 kg per litre — check your product\'s coverage chart and add ~10% for waste and partial tiles. 🔒 In your browser.
How the grout calculator works
The calculator works out the total length of grout joints across your area — roughly the area times (tile length + tile width) ÷ (tile length × tile width) — then multiplies by the joint width and joint depth to get a volume. Joint depth is about the thickness of your tile. It reports the grout volume in litres and an approximate dry weight (assuming a cementitious grout at about 1.6 kg per litre).
Always cross-check against your grout product's coverage chart, since coverage varies by brand, tile type and how full the joints are packed. Add roughly 10% for waste, mixing losses and partial tiles at the edges. Mosaic and small tiles use far more grout per square metre than large-format tiles because they have many more joints; very tight (rectified) joints use less.
Frequently asked questions
How much grout do I need?
It depends on your area, tile size and joint size. Enter those and the calculator gives the grout volume in litres and an approximate weight. As a rule, smaller tiles and wider or deeper joints need more grout.
What is the joint depth?
Roughly the thickness of your tile, since the grout fills the gap for the full depth of the tile. Enter your tile's thickness in millimetres (commonly 6–10 mm for wall and floor tiles).
Why do small tiles need more grout?
Because they create far more linear metres of joint per square metre of area. A wall of mosaic tiles has many times the joint length of the same wall in large-format tiles, so it consumes much more grout.
Should I buy extra grout?
Yes — add about 10% for mixing waste, joints packed fuller than assumed, and cut tiles at edges. Buying a little extra from the same batch also protects against colour variation between bags.