Math & Everyday
Tile Calculator
Tiles and boxes needed for a floor or wall, with a waste-factor buffer.
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CalcoTools · Tile Calculator · generated 9/1/2026, 1:30:19 PM
About the Tile Calculator
Calculates how many tiles (and boxes, if sold by the box) are needed for a floor or wall, from the area's dimensions, the tile size, and a waste-factor buffer.
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How to use it
- Enter the room or wall's length and width in feet.
- Enter the tile's width and length in inches.
- Adjust the waste factor for your layout.
- Optionally enter tiles per box to see boxes needed.
- Read the tiles (and boxes) to buy.
Formula
Room area = length × width. Tile area (sq ft) = (tile width ÷ 12) × (tile length ÷ 12). Area with waste = room area × (1 + waste %). Tiles needed = ceiling(area with waste ÷ tile area). Boxes needed = ceiling(tiles needed ÷ tiles per box).
Worked example
A 10ft × 10ft room with 12x12in tiles and a 10% waste factor: area with waste is 110 sq ft, requiring 110 tiles.
Recommended Waste Factor by Layout
| Layout Type | Waste Factor |
|---|---|
| Simple straight lay | 10% |
| Diagonal or offset pattern | 15-20%+ |
Interpreting your result
Tile counts are always rounded up to the next whole tile. 10% waste is a widely used baseline for a simple straight-lay room; increase for diagonal, offset, or brick-pattern layouts. Box quantities vary by manufacturer. This calculator doesn't compute grout, thinset/mortar, or underlayment.
Recommendations
- • Diagonal and patterned layouts need more waste allowance (15-20%+) than a simple straight lay (10%).
- • Buy all tiles from the same production run/dye lot when possible.
- • Keep 1 extra box in reserve after finishing, in case of future repairs.
Frequently asked questions
You can't purchase a fractional tile.
Related searches
Sources
- The Spruce — How to Calculate How Much Tile You Need — accessed 2026-08-30