Measure the net floor area, add a realistic allowance and always round whole tiles and boxes upward.
Start with the floor area
A rectangular room measuring 4 × 3 m has 12 m². For an irregular layout, split it into simple shapes or draw the polygon, checking each segment.
Area per tile
A 60 × 60 cm tile covers 0.60 × 0.60 = 0.36 m². Dividing 12 by 0.36 gives 33.33, so the theoretical minimum is 34 whole tiles. That assumes ideal use of every cut.
Allow for cutting and damage
With a hypothetical 10% allowance, the target area is 12 × 1.10 = 13.2 m². Then 13.2 ÷ 0.36 = 36.67, rounded up to 37 tiles. A diagonal layout, narrow strips, irregular edges and breakage may require more.
Convert to boxes
If a box contains four tiles, 37 ÷ 4 = 9.25, rounded up to 10 boxes (40 tiles). Compare this with the useful area per box stated by the manufacturer, and check batch and shade consistency.
Before buying
- Confirm room geometry and tile size.
- Choose an allowance that suits the laying pattern.
- Check the tile batch, intended indoor/outdoor use and surface conditions.
- Remember that adhesives, joints, waterproofing and the subfloor need separate assessment.
PisoExacto can calculate area for rectangular, L-shaped and custom outlines and provide an approximate tile and box count. It does not generate a cutting layout.
Try it in PisoExacto
Enter your own measurements and compare the result. Actual quantities depend on your materials.