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Tile Calculator

Estimate the total number of tiles necessary to cover a floor, wall, or any other surface. Account for mortar gaps and industry-standard wastage to figure out exactly how many boxes to buy.

Tile Dimensions

Gap

Area to Cover

Purchasing & Box Info

Results

118
Tiles Needed (Exact)
Total Area120.00 sq ft
Tiles + 10% Wastage130 tiles
Boxes Needed13 boxes
Estimated Cost$455.00

Measuring Tile Gaps

When installing tiles, you cannot place them perfectly flush against each other. You must leave a small gap for grout or mortar.

Even a small 1/8 inch (0.125") gap adds up significantly over a large room. Our calculator factors in the mortar joint to give you the precise "effective area" of each tile, preventing you from overbuying.

Why Factor Wastage?

Rooms are rarely perfect grids. You will inevitably need to cut tiles to fit around edges, corners, and fixtures (like toilets or cabinets).

Standard Room: Add 10% wastage

Complex Room (many corners): Add 15%

Diagonal Tile Pattern: Add 20%

Tile Installation Guide

Tile Size

Tile size can range anywhere from smaller mosaics that are 3/8", to 24" × 48" slab tiles and everything in between. Square sizes (same width and length) are the most popular, accessible, and easiest to install. Large tile sizes can make smaller rooms appear bigger, as well as more open and clean because there are fewer grout lines. However, installing larger tiles results in more wastage, while using smaller tiles can help add texture to a room.

Material Types

There are a number of different classifications of tiles, including ceramic, porcelain, glass, quarry, and stone. Ceramic and porcelain tiles are the most cost efficient, and come in a variety of different styles. Glass tiles, while not appropriate for flooring because they crack under pressure, are visually unique and interesting; they are most commonly used for kitchen and bathroom backsplashes. Quarry tiles have rough surfaces that are good for floors that require grip, and are commonly used outdoors and in restaurant kitchens. Stone tiles include marble and granite, which provide unique and natural stone patterns, textures, and colors that are difficult to achieve using ceramics.

Layout Patterns

There are many different patterns used when installing tiles. The most common pattern used is a linear grid, with square or rectangular tiles, or a pattern involving angled squares or rectangles that form a typical diamond shape.

  • Running Bond: Involve offset rows or columns of tiles (like those used with brick walls), usually with a 2:1 length to edge ratio. Running bonds generally use about 10% more material.
  • Herringbone: Involve aligning tiles in angled patterns, usually 45 or 90 degrees. Similar to running bond layouts, herringbone layouts use more material than linear layouts.

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How the calculation works

Tile count is the number of tiles along the length times the number along the width, then increased for cuts and breakage.

Tiles = ceil(length ÷ tile) × ceil(width ÷ tile) Order = ceil(tiles × (1 + waste))

A 10% waste allowance is common for a straight layout. Diagonal layouts need more.

Worked example: 120 by 100 inch floor, 12 inch tiles, 10% waste

  1. Along the length: 120 ÷ 12 = 10.
  2. Along the width: 100 ÷ 12 = 9, which rounds up to 9.
  3. Tiles = 10 × 9 = 90.
  4. With 10% waste, order 99.

12 inch tiles on a 120 by 100 inch floor

WasteTiles to order
0%90
10%100
15%104

Frequently asked questions

How many 12-inch tiles cover 120 by 100 inches before waste?▼
90.
How many should you order with 10% waste?▼
99.
Why round each side up before multiplying?▼
A partial tile at the edge still requires a whole tile.