Tiling
Tile & Epoxy Grout Calculator
Enter the tile size, joint width and floor area. This works out how much cementitious or epoxy grout you need — in bags and kits, not just a weight — from the joint geometry in IS 15477 and EN 13888, and warns you when small or mosaic tiles multiply the quantity.
Your tiles
Measure the tile and the joint you are actually setting, not the box nominal.
mm
mm
mm
mm
m²
kg/L
What this assumes
- Grout quantity here is calculated from joint geometry — tile size, joint width and tile thickness — using the method behind IS 15477 and EN 13888, not from a manufacturer’s printed coverage figure. Tile grouts in our catalogue publish pack sizes and shades but almost never a kg/m² rate, so every number on this page is an engineering estimate and is labelled as one.
- The formula assumes the joint is filled to the full depth of the tile. Real joints are sometimes raked shallower, or the tile sits proud with a deeper joint — both change the answer, so treat the tile thickness as the grout depth and edit it if your joint depth is actually different.
- Density defaults to ~1.6 kg/L for cementitious grout and ~1.55 kg/L for epoxy, and both are editable. The low–high band on the result is the same calculation across the normal density range for that grout type — a real variable, not a published spread.
- Wastage covers mixing losses, part-used bags, spillage and raking. 10% is reasonable for a straightforward floor; raise it for mosaics, textured or riven tiles, and small or cut-heavy areas where more grout ends up on the sponge than in the joint.
- Epoxy grout is a two- or three-part kit — resin, hardener and coloured filler — that must be mixed and used in full once opened, so it is ordered in whole kits, rounded up, never decanted by the kilo.
- This is grout for the joints only. It excludes tile adhesive, spacers, breakage allowance and any grout kept back for a second application or a repair.
Where these figures come from. Tile grout in the Space Arc catalogue (Asian Paints SmartCare, Dr. Fixit and others) publishes pack sizes, shades and shelf life rather than a coverage rate. Where you match your job to a stocked product, its packaging text is shown verbatim so you can order in the sizes that are actually sold. The consumption method — joint volume from tile size, joint width and joint depth — follows IS 15477 (laying of ceramic and vitrified tiles) and the grout classification in EN 13888 (CG cementitious, RG reaction-resin / epoxy). It is a standard engineering calculation, shown on screen so you can check it, not a figure lifted from any one datasheet.
Questions
How is tile grout consumption calculated?
From the joint geometry. Grout per square metre = ((tile length + tile width) / (tile length × tile width)) × joint width × joint depth × grout density, with the tile dimensions in mm and density in kg per litre. A 300 × 300 × 8 mm tile with a 3 mm joint at 1.6 kg/L comes to about 0.26 kg per m² before wastage. It is a standard estimate, not a printed manufacturer rate, which is why the tool labels it indicative.
Why do small or mosaic tiles need so much more grout?
Because the smaller the tile, the more joint there is per square metre. A 600 × 600 mm floor has roughly 3.3 m of joint per m²; a 20 × 20 mm glass mosaic has around 100 m. Halve the tile and you roughly double the grout, so a mosaic can take ten to twelve times what a large-format tile does. This is the commonest reason a grout order runs short, so the tool flags it.
Does epoxy grout need more than cementitious?
By weight they are close — epoxy is a touch lighter (~1.55 kg/L against ~1.6 kg/L), so for the same joints it works out slightly less. The real difference is how you buy it: epoxy comes as a resin + hardener + filler kit that has to be mixed and used in full, so it is ordered in whole kits, rounded up, while cementitious can be bought and opened by the bag.
Should I enter tile thickness or joint depth?
Enter the actual depth the grout fills. For most floor and wall tiles the joint runs the full thickness of the tile, so tile thickness is the right figure. If the joint is deliberately raked shallower than the tile, or the tile is unusually thick, put the real joint depth in the thickness box instead — grout follows the depth, not the tile.
How many bags or kits should I actually order?
Round up to whole packs and keep a little in hand. The tool rounds up to the nearest combination of the pack sizes and prefers the fewest packs that clear the requirement, then states the spare. For epoxy, order in complete kits — a part-mixed kit cannot be saved for later — and for a large floor keep one spare bag or kit against breakages and a touch-up.
Is this an official manufacturer figure I can put in a BOQ?
Treat it as a sizing and pricing estimate, not a quoted coverage. It is derived from joint geometry to IS 15477 / EN 13888, not from a datasheet, and real consumption swings with joint fill, tile regularity and workmanship. Confirm against the current product data and a small site trial before it goes into a tender.
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