Grout Calculator

Your details

The longer side of one tile. A common wall tile is 300 mm (about 12 in).
mm
The shorter side of one tile. Square tiles have the same length and width.
mm
Grout fills the joint to the tile depth, so the joint depth equals the tile thickness, usually 6-10 mm.
mm
The spacing between tiles, set by your spacers. Wall tiles use 2-3 mm; floor tiles 3-5 mm.
mm
Length × width of the tiled surface. Split an irregular shape into rectangles and add them.
m²
Sets a typical density: unsanded ~1.5, sanded ~1.6, epoxy ~1.7 kg/L. Override below if you wish.
Extra grout lost to mixing, spreading and cleaning the tile faces. 10% is typical.
%
The bag size you plan to buy, used to round up to whole bags.
Currency
Bags to buy
1
Grout weight (with waste)2.77 kg
Joint volume1.58 L
Grout per area0.28 kg/m²
Tiles needed109
1 bags
Small job<2Room sized2-5Large job5+

Buy 1 bags, about 2.77 kg of grout.

  • Grout use is driven by the joint size relative to the tile: small tiles and wide joints mean far more grout per area than large tiles with thin joints.
  • The joint depth equals the tile thickness, so thicker tiles fill more deeply and need more grout for the same joint width.
  • Sanded grout is the workhorse for joints 3 mm and wider; switch to unsanded for very fine joints to avoid scratching polished tile.

Next stepRound up to whole bags and cross-check the calculated weight against the coverage figures printed on your grout sack.

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