How it works
Estimate whole tiles using nominal face dimensions. Grout spacing and cuts are not modelled individually.
tiles = ceil[area(1+waste)/(length × width)]
Worked example
Show example inputs and result
Surface area: 20 · Tile length: 30 · Tile width: 30 · Waste allowance: 10.
- Tiles
- 245
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy