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Tile Calculator

Calculate exact tile piece counts and square footage for bathroom floors, kitchen backsplashes, and walk-in showers with customizable waste allowances.

Tile Quantity & Square Footage Calculator

Estimate tiles required for floors, backsplashes, or showers including cut waste.

Common Tile Sizes (in)
%

10% standard grid pattern; 15% for diagonal or complex herringbone cuts.

Recommended Tiles to Purchase
132 Tiles

Base requirement: 120 tiles (120.0 exact) + 10% extra

Total Surface Area120.0 sq ft12 × 10 ft
Single Tile Area1.000 sq ft12×12 in
Base Tiles Required120 tilesBefore waste factor
Extra Cut Buffer+12 tilesTrim, edge cuts & spares
Calculation Steps
  • 1.Total room surface area: 12.0 ft × 10.0 ft = 120.00 sq ft
  • 2.Single tile coverage: 12 in × 12 in = 144.00 sq in (1.0000 sq ft)
  • 3.Exact tiles required: 120.00 ÷ 1.0000 = 120.00 tiles (round up: 120)
  • 4.Recommended purchase with 10% waste factor: ceil(120.00 × 1.10) = 132 tiles

Mathematical Formula & Calculation Method

Room Area = L × W | Tile Area = (L_tile × W_tile) / 144 | Tiles = (Room Area / Tile Area) × (1 + Waste / 100)

Formula Components:

  • Room Area = Length (ft) × Width (ft)
  • Tile Area (sq ft) = [Tile Length (in) × Tile Width (in)] ÷ 144
  • Base Tiles Needed = Room Area ÷ Tile Area
  • Recommended Tiles with Waste = ceil(Base Tiles × (1 + Waste % / 100))

How It Works

1

Enter the area dimensions (length and width in feet or meters).

2

Input the dimensions of an individual tile in inches (e.g. 12×12 or 3×6).

3

Specify waste percentage (10% standard grid, 15% for diagonal/herringbone).

4

The tool computes total surface area, single tile coverage, and recommended tile count.

Practical Calculation Examples

10×8 ft Bathroom Floor with 12×12 inch Ceramic Tiles

Tiling an 80 sq ft bathroom floor with 10% cut waste.

Step 1:Room area: 10 × 8 = 80 sq ft.
Step 2:Tile area: (12 × 12) ÷ 144 = 1.0 sq ft per tile.
Step 3:Base tile count: 80 ÷ 1.0 = 80 tiles.
Step 4:Add 10% waste: 80 × 1.10 = 88 tiles.
Outcome: Order 88 tiles (80 for coverage, 8 for cut waste).

30 sq ft Kitchen Backsplash with 3×6 inch Subway Tiles

Backsplash with 15% waste for edge cuts around outlets.

Step 1:Tile area: (3 × 6) ÷ 144 = 0.125 sq ft per tile (8 tiles per sq ft).
Step 2:Base tiles: 30 ÷ 0.125 = 240 tiles.
Step 3:Add 15% waste: 240 × 1.15 = 276 tiles.
Outcome: Order 276 subway tiles.

Important Assumptions & Estimator Guidance

  • Calculations assume standard grout joint widths (1/16" to 1/8") included in waste buffer.
  • Surface is flat and plumb without substantial subfloor variations.
  • Dye lots match across the entire purchase.

Common Pitfalls & Mistakes to Avoid

Not accounting for tile breaks during diagonal wet-saw cuts

Complex tile cuts around drains, pipes, and electrical outlets frequently fracture natural stone or porcelain tiles.

Correction: Use a 15% waste factor when tiling bathrooms or kitchens with numerous obstacles.
In-Depth Companion Guide

How to Calculate Flooring Needed for a Room

Master flooring estimation: room square footage, cutting waste percentages, plank box rounding, and allowances for complex layouts.

Read Companion Guide

Frequently Asked Questions

Exactly 1 tile. A 12-inch by 12-inch tile equals 144 square inches, which is precisely 1 square foot.

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