Quick answer
Calculate the net tiled area, divide by the coverage area of one tile, add a layout-specific allowance and round to whole tiles or boxes.
Step by step
- Measure the surface. Calculate floor, wall or backsplash area.
- Find tile coverage. Convert tile dimensions to square feet.
- Add waste. Consider cuts, pattern and breakage.
- Round packages. Use exact box coverage and round up.
Formula or rule of thumb
tiles = ceil((net area × waste factor) ÷ tile area)
Example
A 100 ft² area using 12 × 12 in tiles with 10% allowance needs about 1,100 tiles before box rounding.
Common mistakes
Do not confuse nominal tile size with the actual coverage when spacers, grout joints or mosaics are involved.
Planning note: product yields, installation methods, site conditions and local requirements can change the final quantity. Use the exact manufacturer or supplier information before purchasing.
FAQ
Should I keep spare tiles?
Keeping matching spare material can help future repairs, especially for discontinued products.
Does diagonal layout need more?
Usually, because perimeter cuts create more offcuts.
Do wall tiles use the same waste?
Not always. Surface shape and pattern determine the allowance.