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Tile Calculator

Estimate how many floor or wall tiles to buy from room size, tile size, metric or imperial units, and 10, 15, or 20 percent waste factors for layout complexity.

Published

Tiles needed
Total tiles to purchase
138 tiles
Room area
120.00 square feet
Tile size
12 × 12 inches
Tile area
1.000 square feet each
Base tiles needed
120 tiles
Extra tiles (15% waste factor)
18 tiles
Boxes
12 boxes

Waste is applied once to the unrounded tile count, then tiles and boxes are rounded up. Verify actual product coverage and cut allowance.

Measurement unit
ft
ft
in
in

Results update as you type.

Tile Calculator

Estimate how many floor or wall tiles to buy from room size, tile size, metric or imperial units, and 10, 15, or 20 percent waste factors for layout complexity.

Inputs and method

Enter room and tile dimensions, a selected planning allowance, and tiles per box. The selected 10%, 15%, or 20% is an input scenario, not a universal installation rule. It is applied to the unrounded area-based tile count; tiles are rounded up once with floating-point tolerance for mathematically exact integers, then boxes are rounded up from that purchase count.

Calculations retain full floating-point precision until the labeled display step. Counts and packages use an explicit upward ceiling only where a whole purchase unit is required.

Interpreting the estimate

Use the result as a planning value and keep input precision consistent with the measurements or source data you have. Small displayed differences can come from final-place rounding; intermediate values are not rounded.

Assumptions and limits

Actual coverage, grout joints, layout, cuts, breakage, pattern matching, and package quantities are product- and project-specific inputs.

Empty entries, invalid numbers, prohibited negatives, zero denominators, impossible relationships, and unsupported options trigger a validation message instead of a misleading result.

Sources

  • Area measurement — supports SI area units and conversions; the geometric arithmetic is independently derived.

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Tile Calculator updated at