Tile Calculator

Enter your room dimensions and tile size to find out exactly how many tiles you need. Input the room length and width, your tile length and tile width, and an optional grout gap size. Add a box size and price per tile to get box counts and total cost. The calculator returns total tiles needed, total boxes, total area, and estimated material cost — with a 10% waste allowance built in.

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Enter the length of the area you want to tile

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Enter the width of the area you want to tile

in

Length of a single tile

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Width of a single tile

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Gap between tiles (typically 1/16" to 1/2"). Enter 0 for no gap.

Extra tiles to account for cuts and breakage

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Number of tiles in one box or pack

Cost of a single tile

Results

Tiles Needed

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Boxes Needed

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Total Room Area

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Area per Tile

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Estimated Material Cost

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Tile Coverage Breakdown

Frequently Asked Questions

How many tiles do I need for my floor or wall?

Divide the total area of your room by the area of one tile to get the base count. Always add a waste buffer — 10% is standard for straight layouts, and 15–20% for diagonal or complex patterns. This calculator does that math automatically and rounds up to whole tiles.

Why do I need extra tiles beyond the exact area?

Tiles at the edges of a room almost always need to be cut to fit. Some tiles crack during cutting, and others may break during installation. A 10% overage is the industry-standard recommendation to avoid running short mid-project. Diagonal patterns and intricate designs may need up to 20% extra.

What grout gap size should I use?

Grout gaps (also called grout lines or spacing) typically range from 1/16 inch to 1/2 inch. Smaller tiles like mosaics often use a 1/16" gap, while larger floor tiles commonly use 3/16" to 3/8". Your tile manufacturer usually specifies a recommended gap size. This calculator accounts for the gap when estimating tile count.

How do I calculate tile square footage?

Multiply the tile length by its width to get its area. For example, a 12-inch × 12-inch tile has an area of 144 square inches, which equals 1 square foot. A 18-inch × 18-inch tile covers 2.25 square feet. This calculator handles the unit conversions automatically.

How many tiles are typically in a box?

The number of tiles per box varies by manufacturer and tile size. Smaller tiles (4"×4" or 6"×6") often come 20–50 per box, while larger tiles (12"×12" or 18"×18") may come in boxes of 5–15. Always check the box label for the tile count and coverage area.

What is the standard tile size?

Common floor tile sizes include 12"×12", 16"×16", 18"×18", and 24"×24" inches. For walls and backsplashes, 4"×4", 4"×8", and 3"×6" subway tiles are popular. Large-format tiles (24"×48" or larger) have become increasingly popular for modern interiors.

How do I tile a diagonal or pattern layout?

Diagonal layouts (tiles set at 45°) require significantly more cuts along the room's perimeter, which increases waste. Add at least 15% overage for diagonal patterns. Herringbone, chevron, and other complex patterns may require 20% or more extra tiles due to the increased number of cuts needed.

Does this calculator include the cost of grout and adhesive?

No — the cost estimate here covers tiles only, based on the price per tile you enter. Grout, mortar or mastic adhesive, backer board, tile spacers, and labor are additional costs not included in this calculation. These materials can add $1–$5 or more per square foot to your total project cost.

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