TOOL 05 / FREE · NO SIGNUP
Tile Calculator
Estimate tile count, waste allowance and whole boxes from your floor and tile dimensions.
Worked example loaded. These are example measurements and product assumptions.
THE METHOD
How to use this estimate
- Measure the net floor area or enter it directly. A straight-lay area estimate is the starting point.
- Tile dimensions and joint width define an approximate module. Layout, edge cuts, diagonal patterns and breakage can change actual requirements.
- Enter tiles per box to turn the unrounded area requirement into whole purchase boxes.
estimated tiles = area × (1 + waste / 100) ÷ ((tile length + joint) × (tile width + joint))
A worked example
The “Load worked example” button uses the same inputs as this example. Explicit unit suffixes keep their meaning in either unit system.
- How will you measure?
- I know the area
- Net area
- 20 m2
- Tile length
- 300 mm
- Tile width
- 300 mm
- Grout joint
- 0
- Waste allowance
- 10
- Tiles per box
- 12
- Measured floor
- 20 m² / 215.278 ft²
- Area with allowance
- 22 m² / 236.806 ft²
- Boxes
- 21
- Purchased tiles
- 252
- Estimated extra tiles
- 7
Questions, answered
Does this support herringbone or diagonal layout?
No layout is optimized in this release. Adjust the waste allowance based on a verified installation plan.
When do you round?
Tile count rounds for display. Boxes are calculated from the original unrounded requirement, then rounded once.
Sources and product assumptions
These references explain units or product specifications. Your selected product label takes priority; none of these sources endorses this calculator.
- Daltile Porcealto — actual tile sizes, pieces per carton and joint example (PDF) ↗
- NIST length and area conversions ↗
Source check: 4 October 2026. Worked examples use stated, editable assumptions.