Tile Calculator
Calculate how many tiles you need from surface dimensions, tile size and waste allowance, with an optional box estimate.
How to Use
- Enter the rectangular floor or wall length and width, then choose feet or meters.
- If part of that rectangle will not be tiled, enter its total excluded area; otherwise leave it at 0.
- Enter the individual tile length and width and choose inches, centimeters or millimeters.
- Adjust the extra tile allowance to reflect cuts, breakage and layout complexity. The default shown is only an editable starting value, not a universal recommendation.
- Optionally enter the number of tiles per box if you want an estimated whole-box count.
Formula
- Net surface area
- net_area = surface_length × surface_width − excluded_area
- Purchase area
- purchase_area = net_area × (1 + waste_percentage ÷ 100)
- Tile area
- tile_area = tile_length × tile_width
- Tile count
- tiles = round up(purchase_area ÷ tile_area)
Worked Example
A 12 ft × 10 ft floor using 12 in × 12 in tiles with 10% extra allowance.
- Floor area: 12 × 10 = 120 ft².
- With 10% extra allowance: 120 × 1.10 = 132 ft².
- A 12 in × 12 in tile covers 1 ft².
- 132 ÷ 1 = 132 tiles.
Result: 132 tiles
About This Tool
What this tool does
This calculator estimates the number of whole tiles needed to cover a rectangular floor or wall after subtracting any excluded area and adding the extra-material percentage you choose.
When to use it
Use it for tile purchasing estimates for floors, shower walls, backsplashes or other rectangular surfaces when you know the surface dimensions and individual tile size.
What the result means
The tile count is rounded up to a whole tile because partial tiles still require purchasing a full tile. If tiles per box is entered, the box count is also rounded up to a whole box.
Assumptions & limitations
The surface is treated as one rectangle and tile coverage is based on the nominal tile face dimensions entered. This calculator does not model grout-joint width, diagonal/herringbone patterns, edge cuts, tile calibration, damaged tiles or manufacturer-specific carton coverage. Those factors can change real material needs, so verify against the product packaging and installation layout before purchasing.