Layout geometry
Hexagon tile coverage (tiles per m² and order quantity)
- where
- hexagon side length (mm)
- size across the flats (mm)
- face area of one hexagon (mm²)
- hexagons per m²
- joint width (mm)
- hexagons to order
- area to tile (m²)
- waste allowance (%)
Explain this equation
Works out how many regular hexagon tiles cover a square metre and how many to order, from the across-flats size you see on the tile label.
F is the distance across the flats and s is the length of one side. Ah is the face area of a hexagon. N is the number per square metre, using the size across the flats plus the joint, F + j, because each tile with its share of the joint forms a slightly bigger hexagon. T is the number to order for area A with waste w.
A regular hexagon is six equilateral triangles, which gives an area of 3√3/2 × s². Across the flats is √3 × s, so the same area can be written √3/2 × F², which is what the tiles-per-m² line uses.
Sense check: a 200 mm across-flats hexagon is about 231 mm point to point and covers about 0.035 m² with a 3 mm joint, so about 28 per m².
Watch out: do not treat a 200 × 230 hexagon as a rectangle; that overstates its area by about 15% and you will be short.
Coverage of regular hexagon tiles. The face area is 3√3/2 × s²; with a joint, each tile occupies a hexagon whose across-flats size is F + j.
Enter your values to see the result.
Good to know
Hexagons are usually sold by across-flats × point-to-point size (e.g. 200 × 230 mm). The point-to-point size is 2s = 2F/√3. Every edge piece is a cut, so allow at least the patterned/diagonal waste of about 15%, more for small rooms.
Common mistake
Treating a 200 × 230 hexagon as a 200 × 230 rectangle. That overstates its area by about 15% and under-orders the tiles.
Limits
Regular hexagons only. Elongated or picket shapes need the supplier’s pieces-per-m² figure. Waste is a judgement allowance.
Sources
Results are calculations from the published methods and manufacturer figures shown, and depend on the data you enter. Always follow the tile, adhesive and grout manufacturers’ instructions, BS 5385 and the Tile Association guidance. Coverage rates vary by product and substrate. Check prices and VAT rules with your own records and HMRC.