Tile Calculator
Calculate the number of tiles needed for a floor or wall. Includes waste percentage and grout width for accurate tile estimates.
ft
ft
in
in
in
%
Tiles Needed
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Room Area —
Tile Area (each) —
How to Use This Calculator
- Enter the room length and width in feet.
- Enter the tile width and height in inches.
- Enter the grout joint width in inches and a waste percentage.
- Results show tiles needed and total area.
Formula
Tile area (ft²) = (tile_W_in + grout_in) × (tile_H_in + grout_in) ÷ 144
Tiles = ceil(Room area ÷ Tile area × (1 + waste%))
Example
Example: 10×12 ft room, 12×12 in tile, 0.125 in grout, 10% waste → 133 tiles.
Frequently Asked Questions
- Divide the room area by the tile area. Add a waste percentage (typically 10%) for cuts and breakage.
- Use 10% for straight layouts, 15% for diagonal layouts, and 15–20% for complex patterns or irregular rooms.
- Larger grout joints mean slightly fewer tiles fit per row. The calculator adds the grout width to each tile dimension before computing coverage.
- Enter the actual tile face dimensions in inches (e.g., 12×12 for a 12-inch tile). The grout joint is added on top of that.
- Yes — the result is always rounded up to the next whole tile to ensure you have enough for the cut pieces.