Construction

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Tile Calculator.

Calculate tiles, area, and waste for flooring or walls

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Results update as you type.

Room Dimensions

Tile Details

Length of one side (assuming square tile).

Extra tiles for cuts and breakage (usually 10%).

Tiles Needed

132

Including 10% waste buffer

Room Area: 120 sq ft

Room Area

120.00sq ft
Base Tiles: 120

Base Tiles

120.00
Boxes Needed: 11

Boxes Needed

11.00
Waste Buffer: 12 tiles

Waste Buffer

12.00tiles

FAQs

How do I calculate tiles needed?

Divide the total area of the room by the area of a single tile. If your room is 100 sq ft and your tiles are 1 sq ft (12x12), you need 100 tiles. Always add 10% for waste.

Why should I add a waste percentage?

Waste accounts for tiles that need to be cut to fit edges, accidental breakage during installation, and ensuring you have enough for future repairs. 10% is standard; 15% is safer for complex patterns.

How many tiles are in a box?

It varies by manufacturer and tile size. Many standard 12x12 tiles come 12 to a box, covering 12 sq ft. Check your specific tile packaging to adjust the box estimate.

Cite this calculator

Canonical URL: https://mathify.one/fr/construction/tile

Cite as: Mathify. (2026). Calculateur de Carrelage. https://mathify.one/fr/construction/tile

Use Cases

Plan a flooring project

Determine how many tiles and boxes to buy for a new floor in a square or rectangular room, including extra for waste.

Example: A 12 ft x 10 ft room with 12-inch tiles and 10% waste.

Estimate tiles for a wall backsplash

Calculate the number of tiles needed for a rectangular wall area, such as a kitchen backsplash, accounting for waste.

Example: A 5 ft x 3 ft backsplash with 4-inch tiles and 15% waste.

Frequently Asked Questions

How does the tile calculator estimate the number of tiles needed?
The calculator uses the room's dimensions (length and width) to compute the total area. It then divides that area by the area of a single tile (which you input) to determine the number of tiles required. It also adds a waste percentage to account for cuts and breakage.
What is the waste percentage and why is it important?
The waste percentage is an extra amount of tiles added to your estimate to cover tiles that need to be cut to fit edges, or that may break during installation. A typical waste is 10%, but it can be higher for complex layouts or diagonal patterns. Including waste ensures you don't run short.
Can I use this calculator for both flooring and wall projects?
Yes, the calculator is designed for both flooring and wall projects. Simply enter the length and width of the area (for walls, use the wall's height and width) and the tile size. It works for any square or rectangular area.

Tips & Common Mistakes

Tips

  • Measure the length and width of the area in the same units (e.g., feet or meters) to ensure accurate area calculation.
  • Choose a waste percentage based on the complexity of the layout: 10% for straight layouts, 15-20% for diagonal or patterned installations.
  • Always round up the number of boxes needed to the nearest whole box, as tiles are sold in boxes and you can't buy a fraction of a box.
  • Double-check your tile size input: use the actual tile dimensions, not the nominal size, to avoid underestimating.

Common Mistakes to Avoid

  • Forgetting to include a waste percentage, leading to a shortage of tiles if any are cut or broken.
  • Mixing units (e.g., entering room dimensions in feet but tile size in inches) without converting, which results in an incorrect area calculation.
  • Not accounting for irregular room shapes: this calculator assumes square or rectangular areas, so for L-shaped rooms, divide into rectangles and calculate separately.

Last updated: August 13, 2026