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Tile calculator

Floors and walls: the tiles and boxes, with cuts allowed for, and the adhesive and grout.

Units
m²

Length × width of the floor; add each wall separately.

mm
mm
mm
mm
Laid

On the box.

kg/m²

On the bag.

Job sheet

Tile calculator
Tiles needed
61 tiles
10.00 m² + 10% for cuts
Boxes
8 boxes
8 tiles per box
Adhesive
40.0 kg
2 bags of 20 kg, at 4 kg/m²
Grout
2.5 kg
0.22 kg/m² for 3 mm joints
Tiles per m²
5.5

Estimates only: check your sizes, and the figures on the pack, before you order.

How it works

Count the tiles a square metre takes, joints included, multiply by the area, and add the cuts.

  • Tiles per m²: 1,000,000 ÷ ((length + joint) × (width + joint)), sizes in mm.
  • Tiles: area × tiles a m² × (1 + wastage), rounded up.
  • Adhesive: area × the rate on the bag (kg a m²).
  • Grout: (length + width) ÷ (length × width) × thickness × joint × 1.6 kg a m², the formula grout makers print on their data sheets.

A worked example

A 10 m² floor in 600 × 300 mm tiles with 3 mm joints: 1,000,000 ÷ (603 × 303) = 5.47 tiles a m². With 10% for cuts: 10 × 5.47 × 1.1 = 61 tiles, or 8 boxes of 8.

Adhesive at 4 kg a m²: 40 kg, so 2 bags of 20 kg. Grout for 9 mm thick tiles: (600 + 300) ÷ (600 × 300) × 9 × 3 × 1.6 = 0.22 kg a m², about 2.2 kg in all, so 2.5 kg to buy.

Results are estimates. Uneven floors, wide joints and deep beds use more adhesive and grout: the figures on the bags win.

Questions

How many tiles are in a square metre?

Divide one million by (tile length + joint) × (tile width + joint), in millimetres. For 600 × 300 mm tiles with 3 mm joints, that is 5.5 tiles a m².

How much extra tile should I allow for cuts?

About 10% laid straight, and 15% laid on the diagonal or in herringbone. Small rooms with lots of corners and pipes cut more: allow a little extra.

How much tile adhesive do I need per m²?

About 4 kg a m² of cement-based adhesive with a 6 mm notched trowel, typical for wall tiles. Floors and large tiles take a deeper bed and more adhesive: the bag gives the figure for each trowel size.

How is the grout worked out?

With the formula grout makers print on their data sheets (Mapei’s, for one): (length + width) ÷ (length × width) × tile thickness × joint width × 1.6, every size in mm, gives kg a m². 600 × 300 mm tiles, 9 mm thick, with 3 mm joints take 0.22 kg a m².

Can I work in square feet?

Yes: switch to imperial for the area (1 m² is 10.764 ft²). Tile sizes and joints stay in millimetres, the way tiles are sold in the UK and Ireland.

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