Tile Calculator

Calculate the number of tiles needed for any floor or wall area, accounting for grout gaps and waste percentage.

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1. Enter the total area to be tiled by providing the room length and width, or a direct square footage value. 2. Specify the tile dimensions - width and height - in inches or centimeters. 3. Set the grout gap width to adjust the effective coverage area of each tile. 4. Choose a waste percentage (typically 10-15%) to account for cuts, breakage, and pattern matching. 5. Review the total number of tiles and boxes needed, then copy the results for your shopping list.

About This Tool

Tiling a floor or wall requires careful planning to ensure you purchase enough tiles without excessive waste. This tile calculator computes exactly how many tiles you need based on the area to be covered, the tile size, grout joint width, and a configurable waste percentage to account for cuts, breakage, and pattern matching.

Enter your room dimensions or total area along with the tile dimensions, and the calculator determines the number of tiles required. The grout gap setting adjusts the effective coverage of each tile - wider grout lines mean slightly fewer tiles per square foot, while narrow joints require more tiles. The waste factor (typically 10 to 15 percent) ensures you order enough extras for edge cuts, broken pieces during installation, and a few spares for future repairs.

The tool also shows the total area of tiles needed, the number of boxes required (based on tiles per box), and the effective coverage per tile including grout. Whether you are tiling a bathroom floor, a kitchen backsplash, or an entire living room, this calculator gives you the confidence to order the right quantity on the first trip to the store.

Formula / How It Works

Effective Tile Size = Tile Size + Grout Gap | Tiles Needed = Area / Effective Tile Area | Total with Waste = Tiles Needed x (1 + waste%)

Frequently Asked Questions

For a standard straight-lay pattern, plan for 10% waste. For diagonal patterns, add 15% because more cuts are needed along the edges. Complex patterns, large-format tiles, or rooms with many corners and obstacles may require 15 to 20% waste. Natural stone tiles, which are more prone to breakage, also warrant a higher waste factor.
Wider grout gaps slightly reduce the number of tiles needed because each tile plus its surrounding grout covers a larger effective area. For example, a 12-inch tile with a 1/4-inch grout gap covers about 12.25 inches of linear space. While the difference per tile is small, it adds up across a large area.
Break the room into simple rectangular sections, calculate the area of each section separately, and add them together. Then use the total area in this calculator. For L-shaped or complex rooms, you may want to increase the waste percentage by an extra 5% to account for additional edge cuts.
Yes, it is a good idea to keep a few extra tiles from the same batch for future repairs. Tile colors can vary slightly between production batches (known as dye lots), so replacements bought later may not match perfectly. Keeping 5 to 10 extra tiles stored safely is standard practice.
Common floor tile sizes include 12 x 12 inches, 12 x 24 inches, 18 x 18 inches, and 24 x 24 inches. Larger tiles create fewer grout lines and can make a room feel more spacious, but they require a very flat subfloor. Smaller tiles like 6 x 6 or mosaic formats are popular for shower floors and backsplashes.

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