Tile Calculator
Estimate whole tiles for a floor with an editable waste allowance.
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What this tool does
Estimate whole tiles for a floor with an editable waste allowance. Grout joints are conservatively excluded from coverage.
How to use the Tile Calculator
- Enter or select length in ft.
- Enter or select width in ft.
- Enter or select tile length in in.
- Enter or select tile width in in.
- Enter or select waste allowance (%).
- Read the calculated result; change any measurement to compare alternatives.
Formula
tile count=ceil(length×width×144/(tileLength×tileWidth)×(1+waste/100))
- length
- Length (ft, before metric conversion)
- width
- Width (ft, before metric conversion)
- tileLength
- Tile length (in, before metric conversion)
- tileWidth
- Tile width (in, before metric conversion)
- waste
- Waste allowance (%)
Grout joints are conservatively excluded from coverage.
Worked example
For tile calculator, the following measurements illustrate the exact method: Length: 20; Width: 10; Tile length: 12; Tile width: 12; Waste allowance (%): 10.
Inputs
- Length20 ft
- Width10 ft
- Tile length12 in
- Tile width12 in
- Waste allowance (%)10
Result
- Tiles to buy221
- Coverage to order220 sq ft
Results explained
- Tiles to buy
- Tiles to buy from the formula above. Grout joints are conservatively excluded from coverage.
- Coverage to order
- Coverage to order from the formula above, expressed in sqft before metric conversion. Grout joints are conservatively excluded from coverage.
Frequently asked questions
Divide floor area by one tile's area and round up after waste.
Use floor dimensions and actual tile size.
Use 5–10% for simple layouts and 10–15% for diagonal cuts or complicated outlines; the allowance is editable.
Split the outline into rectangles or triangles and calculate each section separately. Do not count overlapping sections twice.
This is a purchasing estimate, not a structural design. Confirm measurements and local requirements before buying or building.