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Professional

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Professional

Tile and Grout Calculator.

Estimates the number of tiles and amount of grout needed for a floor or wall area, including waste allowance.

Results update live as you type.
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Your inputs

How it works

  1. 1

    Calculate the total area in square inches by multiplying length and width in feet and then multiplying by 144.

  2. 2

    Calculate the area of one tile in square inches by multiplying tile length and width in inches.

  3. 3

    Divide the total area by the tile area to get the number of tiles without waste.

  4. 4

    Multiply by (1 + waste percentage/100) and round up to the nearest whole tile.

ceil((area_length * area_width * 144) / (tile_length * tile_width) * (1 + waste_percent / 100))

Frequently asked questions

How do I measure the area for tiling?

Measure the length and width of the floor or wall in feet. For irregular shapes, break into rectangles and add the areas.

Why do I need to add waste percentage?

Waste accounts for cuts, breakage, and future repairs. A 10% waste is typical for straight layouts; 15% for diagonal or patterned layouts.

How is grout amount estimated?

Grout amount depends on tile size, joint width, and thickness. This calculator provides a rough estimate; check the grout manufacturer's coverage chart for precise amounts.

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Tiles Needed

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Grout Needed0lbs
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Estimate for general guidance only — verify important decisions with an appropriate professional.

How it works

Estimates the number of tiles and amount of grout needed for a floor or wall area, including waste allowance.

  1. Calculate the total area in square inches by multiplying length and width in feet and then multiplying by 144.
  2. Calculate the area of one tile in square inches by multiplying tile length and width in inches.
  3. Divide the total area by the tile area to get the number of tiles without waste.
  4. Multiply by (1 + waste percentage/100) and round up to the nearest whole tile.

Formulas

The math behind this calculator, written out so you can verify the result.

Tiles Needed

Tiles = ceil( (Area in sq in) / (Tile area in sq in) × (1 + Waste%) )

Converts the area to square inches, divides by the area of one tile, and adds waste before rounding up.

Grout Estimate

Grout (lbs) ≈ (Number of tiles) × (Joint width in ft) × 0.05

A rough rule of thumb: each tile contributes a small amount of grout based on joint width. Actual coverage varies by grout type and depth.

Real-world use cases

Where this calculation shows up in everyday life.

Floor Tiling

Plan the number of tiles and grout for a new floor installation.

Example: A 12x10 ft kitchen with 12x12 tiles.

Wall Backsplash

Estimate materials for a backsplash or accent wall.

Example: A 6x2 ft backsplash with 4x4 tiles.

Bathroom Remodel

Budget for tile and grout in a bathroom renovation.

Example: A 5x8 ft bathroom floor with 8x8 tiles.

Tips and common mistakes

Tips

  • Always round up to the nearest whole tile to avoid running short.
  • For diagonal layouts, increase waste to 15% or more.
  • Buy extra tiles from the same batch to ensure color consistency.
  • Use a grout float to apply grout evenly and avoid air pockets.

Common Mistakes to Avoid

  • Forgetting to convert feet to inches when calculating tile area.
  • Not accounting for cuts around corners and fixtures.
  • Using the same waste percentage for all layouts; adjust for complexity.

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.