How it works
How to calculate it
The calculator applies the values you enter to this formula:
Tiles = surface area × (1 + waste rate) ÷ tile area.
How to use this calculator
- Measure the surface dimensions.
- Enter the actual tile length and width.
- Apply a layout-based waste percentage and material price.
Worked example
A 20 × 15 ft surface using 12-inch square tiles with 12% waste requires 336 tiles.
Important assumptions
- Grout-joint area is not deducted.
- Tiles are assumed to have uniform dimensions.
- Labor, mortar, grout, and edge pieces are excluded.
Common mistakes to avoid
- Mixing tile inches with surface feet.
- Ignoring cuts around edges and fixtures.
- Treating the raw tile count as a purchasable box count.
Method reviewed June 10, 2026. Prices and rates are user-provided defaults and should be replaced with local values.