Tile Calculator — How Many Tiles Do I Need?

Calculate exactly how many tiles you need for your floor, wall, or backsplash. Enter your room and tile dimensions to get an accurate count including waste.

Measure the length of the area to be tiled
feet
Measure the width of the area to be tiled
feet
Length of one tile in inches (e.g., 12 for a 12×12 tile)
inches
Width of one tile in inches (e.g., 12 for a 12×12 tile)
inches
Standard grout width is 1/8 inch (0.125). Use 3/16 inch for larger tiles.
inches
Add 10% for straight layouts, 15% for diagonal. Accounts for cuts and breakage.
%
Number of tiles per box — check the packaging
tiles
—
Tiles Needed (with waste)
Tiles Needed (exact, no waste) —
Boxes Needed —
Total Area —
Disclaimer This calculator provides estimates for planning purposes only. Actual material requirements may vary based on surface conditions, application method, product brand, and other factors. Always consult product labels and your supplier for precise quantities. We are not responsible for material shortages or excess resulting from the use of this tool.

Assumptions

  • Grout width is added to each tile dimension for spacing calculations
  • Standard grout width is 1/8 inch (0.125 inches)
  • 10% waste is recommended for straight layouts, 15% for diagonal or complex patterns
  • Tile count is always rounded up — you cannot buy partial tiles
  • Area is assumed rectangular — L-shaped or irregular rooms should be split into rectangles and calculated separately

Frequently Asked Questions

How many 12x12 tiles do I need for 100 square feet?

For 100 square feet with 12×12 inch tiles and standard 1/8" grout spacing, you need about 98 tiles (exact) or 108 tiles with 10% waste for cuts and breakage.

How much extra tile should I buy for waste?

Buy 10% extra for straight/grid layouts and 15% extra for diagonal or herringbone patterns. Complex room shapes with many cuts may need up to 20% extra.

Does grout spacing affect how many tiles I need?

Yes, but minimally. Standard 1/8" grout spacing slightly reduces the number of tiles needed because each tile effectively covers a slightly larger area when you include the grout gap.

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