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Enter your room and tile sizes to get the exact number of tiles and boxes to buy, plus adhesive bags, grout weight and a full material cost estimate — in metres, feet, centimetres or millimetres.
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Adhesives & Primers
Grout & Sealants
Cutting & Shaping
Adhesives & Primers
Setting & Alignment
Cutting & Shaping
Cutting & Shaping
Grout & Sealants
Cutting & Shaping
Setting & Alignment
Grout & Sealants
Grout & Sealants
Length × width for each room, or add an L-shaped second leg. Wall mode subtracts doors and windows.
Room area ÷ one tile's area gives the raw tile count before any cuts are considered.
10% for straight and brick bond, 15% diagonal, 20% herringbone. Override it any time.
Tiles are sold by the box, so the count rounds up and shows the spare coverage you'll have left.
Large 60 × 60 cm and 60 × 120 cm tiles make small rooms look bigger and mean fewer grout lines to clean, but they need a flatter substrate. Small formats and mosaics follow uneven floors better and are safer underfoot in wet areas.
Every angled cut creates offcuts you can't reuse. Straight and brick-bond layouts waste the least material; diagonal adds roughly 15% and herringbone up to 20%. Long, narrow rooms and lots of doorways push waste higher still.
Use 2–3 mm joints for rectified porcelain and 3–5 mm for handmade or outdoor tiles. Thicker tiles and wider joints both increase grout use, and large-format tiles need a deeper adhesive bed, so buy one spare bag of each.
| Tile size | Area per tile | Tiles per m² | Typical box |
|---|---|---|---|
| 30 × 30 cm | 0.09 m² | 11.1 | 11 tiles / 1.00 m² |
| 40 × 40 cm | 0.16 m² | 6.3 | 6 tiles / 0.96 m² |
| 30 × 60 cm | 0.18 m² | 5.6 | 8 tiles / 1.44 m² |
| 60 × 60 cm | 0.36 m² | 2.8 | 4 tiles / 1.44 m² |
| 60 × 120 cm | 0.72 m² | 1.4 | 2 tiles / 1.44 m² |
Flexible C2 cement adhesive for porcelain and large formats.
Matching grout plus 2–3 mm spacers or a levelling system.
Manual tile cutter for straights, wet saw or grinder for notches.
Edge trims, silicone for corners, and a sealer for natural stone.
Divide the room area by the area of one tile, then add a waste allowance for cuts. For a 4.2 × 3.6 m room (15.12 m²) with 60 × 60 cm tiles (0.36 m²) that is 42 tiles, or 47 tiles with a 10% waste allowance.
Add 10% for a straight or brick-bond layout, 15% for diagonal, and 20% for herringbone or rooms with many alcoves and angles. Keeping spare tiles from the same batch also protects you against future repairs.
Most cement-based adhesives cover about 4 m² per 20 kg bag at a 6 mm notched-trowel bed. Large-format tiles or uneven floors need a thicker bed, so coverage can drop to 2.5–3 m² per bag.
Grout in kg per m² = ((tile length + tile width) ÷ (tile length × tile width)) × joint width × tile thickness × 1.8, with all tile dimensions in millimetres. Wider joints and thicker tiles both increase grout use.
It depends on tile size: 60 × 60 cm tiles usually come 4 per box (1.44 m²), 30 × 60 cm tiles 6–8 per box, and small 20 × 20 cm tiles up to 25 per box. Check the label and enter it in the box section for an exact box count.
Yes. Switch the mode to Wall or Floor + Wall, enter wall height and width, and subtract door and window openings so you only pay for the area you actually tile.