Tile Calculator

Estimate tiles, grout, and materials needed for floor and wall tiling projects. Includes waste factor and layout optimization.

Tile Calculator

Enter your room dimensions and tile specifications to calculate materials needed for your project.

Room Dimensions

Tile Specifications

Grout Specifications

Standard: 1/4" (0.25") for most tiles, 3/8" (0.375") for larger tiles

Underlayment

Extra tiles for cuts, breakage, and pattern matching (10-20% typical)

Pattern Layout

Additional Areas
Enter 0 for floor-only projects

Additional tile areas (backsplash, shower walls, etc.)

How to Use the Tile Calculator

  1. Measure Your Room

    Measure the length and width of the area to be tiled. For walls, measure the height of the wall section.

  2. Select Tile Specifications

    Choose tile size and type. Different tiles have different installation requirements and costs.

  3. Determine Grout Requirements

    Select grout joint width and type based on your tile size and installation location.

  4. Choose Underlayment

    Select appropriate underlayment based on substrate conditions and tile type.

  5. Select Tile Pattern

    Choose your tile layout pattern. Different patterns require different waste factors.

  6. Add Additional Areas

    Include any additional tile areas (backsplash, shower walls, etc.) in your calculations.

  7. Add Waste Factor

    Include 10-20% extra tiles for cuts, breakage, and pattern matching.

  8. Calculate

    Click "Calculate Tile Materials" to get your material list with quantities and estimated costs.

Practical Example: Calculating a 12×10 Floor

Let's calculate materials for a typical 12×10 foot floor with 12×12 ceramic tiles:

Inputs:

  • Dimensions: 12×10 feet
  • Tile Size: 12×12 inches
  • Tile Type: Ceramic
  • Grout Joint: 1/4 inch (0.25")
  • Underlayment: Cement backer board
  • Pattern: Straight/grid
  • Waste Factor: 15%

Calculations:

  1. Floor area: 12 × 10 = 120 square feet
  2. Tile area per piece: 12×12 inches = 1 square foot
  3. Tiles needed (no waste): 120 tiles
  4. With waste: 120 × 1.15 = 138 tiles
  5. Grout needed: ~5 pounds for 120 sq ft with 1/4" joints
  6. Underlayment: 120 sq ft of cement board
  7. Tile adhesive: ~2 bags (50 lb each)

Result:

You would need approximately 138 tiles (12×12 ceramic), 5 pounds of grout, 120 sq ft of cement backer board, and 2 bags of tile adhesive for a 12×10 floor.

Pro Tip: For wet areas (bathrooms, kitchens), use cement backer board or uncoupling membrane instead of plywood. For large tiles (18×18 or larger), consider using a self-leveling compound if the floor is uneven.

Tile Calculator FAQ

How many tiles do I need? +

Tile quantity depends on:

  • Total area: Room dimensions in square feet
  • Tile size: Tile dimensions in inches
  • Grout joint width: Space between tiles
  • Pattern: Layout pattern (straight, diagonal, etc.)
  • Waste factor: Extra tiles for cuts and breakage
Formula: Tiles = (Total area in sq ft) ÷ (Tile area in sq ft) × (1 + Waste factor) × Pattern multiplier Example: 120 sq ft ÷ 1 sq ft (12×12 tile) × 1.15 × 1.0 (straight pattern) = 138 tiles.

How much grout do I need? +

Grout requirements depend on:

  • Total tile area: More area = more grout
  • Tile size: Smaller tiles = more grout joints
  • Grout joint width: Wider joints = more grout
  • Tile thickness: Thicker tiles = deeper joints
General guidelines:
  • 1/4" joints: 5-7 pounds per 100 sq ft
  • 3/8" joints: 8-10 pounds per 100 sq ft
  • 1/2" joints: 12-15 pounds per 100 sq ft
For a typical 12×12 tile with 1/4" joints: Grout = (Total sq ft ÷ 100) × 6 pounds.

Should I use sanded or unsanded grout? +

Choose based on grout joint width:

  • Sanded Grout:
    • For joints 1/8" to 1/2" wide
    • Provides strength and stability
    • Resists shrinkage and cracking
    • Standard for most floor installations
  • Unsanded Grout:
    • For joints less than 1/8" wide
    • Smoother finish
    • Better for wall tiles and mosaics
    • Less abrasive on delicate tiles
For joints over 1/2", use sanded grout or consider epoxy grout for maximum durability.

What underlayment should I use? +

Underlayment selection depends on:

  • Location:
    • Wet areas (bathrooms, kitchens): Cement board or uncoupling membrane
    • Dry areas (living rooms, bedrooms): Plywood or existing subfloor
  • Tile type:
    • Natural stone: Requires double-layer plywood or cement board
    • Large tiles (18×18+): May require self-leveling compound for uneven floors
    • Vinyl tile: Can be installed over most smooth substrates
  • Subfloor condition:
    • Uneven floors: Self-leveling compound
    • Crack-prone concrete: Uncoupling membrane
    • Wood subfloor: Plywood overlay
Always follow manufacturer recommendations and local building codes.