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Tile Coverage Calculator

Total Tiles = (Project Area ÷ Single Tile Area) × (1 + Waste Factor)

Example: A 100 sq ft room tiled with standard 12"x12" tiles requires exactly 110 tiles (factoring 10% waste).

Project Parameters

Required Tiles

Single Tile Area 1.00 sq ft
Total Tiles Required 110 tiles (Includes 10 extra tiles for cutting waste)

Tile Layout Patterns & Waste Factors

The pattern you choose dramatically affects waste. Straight-lay (parallel to walls) uses the least tile, but diagonal and herringbone patterns require cutting many tiles at angles — increasing waste by 10–20%. Here's what to expect:

Straight / grid layout+5% waste
Brick / offset (33% or 50%)+10% waste
45° diagonal layout+15% waste
Herringbone / chevron+15–20% waste
Mosaic / complex pattern+20% waste

Grout Joint Width Matters

Grout joints reduce the effective coverage of each tile. A 1/8-inch grout joint on 12×12 tiles reduces the effective tile area by about 2% compared to no grout. For very large grout joints (1/2 inch on subway tiles), factor in slightly fewer tiles. Most calculators assume standard grout joints — for very wide joints, subtract 2–3% from your tile count.

Additionally, rooms that aren't perfectly rectangular (L-shaped rooms, rooms with alcoves) should be measured as separate rectangles and totaled. Draw a floor plan and identify each rectangular section.

Frequently Asked Questions — Tile Coverage

How many tiles do I need for a 100 sq ft room?
With 12×12 inch tiles (1 sq ft each), you need 100 tiles + waste. With 10% waste allowance = 110 tiles. With 3×6 inch subway tiles (0.125 sq ft each), you need 800 tiles + 10% waste = 880 tiles.
What waste factor should I use for tile?
Use 5% for straight-lay patterns (parallel to walls). Use 10% for tile offsets like a 33% brick pattern. Use 15% for 45° diagonal layouts or large-format tiles. Use 15–20% for herringbone, chevron, or complex mosaic patterns.
How do I calculate how many tiles I need?
Step 1: Calculate the area of the room in square feet (length × width). Step 2: Calculate the area of one tile in square feet (tile width in inches × tile height in inches ÷ 144). Step 3: Divide room area by tile area to get base tile count. Step 4: Multiply by (1 + waste fraction). Always round up to the nearest whole tile.
Should I buy extra tiles?
Always buy at least 10% extra. Even if your calculation is exact, tiles can crack during cutting, dye lots vary between batches, and future repairs may be impossible to match if the product is discontinued. For natural stone tiles, order 15–20% extra due to higher variation between pieces.
How many tiles are in a box?
This varies by tile size and manufacturer. Subway tiles (3×6) typically come 36–64 per box. Standard 12×12 tiles come 10–15 per box (8–10 sq ft). Large format 24×24 tiles come 4–6 per box. Always check the box label which shows total area covered.

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