How much tile do I need?

Enter the area you're tiling. We add 15% because tile breaks, needs cuts, and you want spares from the same lot for future repairs. Enter your measurements above and this calculator gives you the amount, including a waste allowance where it applies.

Interior surfaces

Tile Calculator

Enter the area you're tiling. We add 15% because tile breaks, needs cuts, and you want spares from the same lot for future repairs.

At a glance

Covers per sq ft: 1 sq ft
Waste allowance: +15%
Answer in: sq ft to buy

Length (ft)Width (ft)

100 sq ft needs:

115 sq ft to buy

Includes a 15% allowance for waste.

15% extra is typical for tile; go higher for large-format tile or diagonal layouts. Buy thinset and grout to match your tile size and joint width.

Interior surfaces

Measure the room, not the wall

Paint, flooring and tile all get bought by total area with an allowance on top, and the allowance is where people come up short. Doorways, closets and cuts add up faster than the walls do.

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How this is worked out

No hidden fudge factor. This is the whole calculation.

Length times width gives the area in square feet.
That area is divided by 1 square feet, which is what one covers, to give the sq ft to buy.
A 15% allowance is added on top for cuts, offcuts and odd shapes.
The total rounds up, since you cannot buy part of a sq ft to buy.

Common questions

How much tile do I need?: Enter the area you're tiling. We add 15% because tile breaks, needs cuts, and you want spares from the same lot for future repairs. Enter your measurements above and this calculator gives you the amount, including a waste allowance where it applies.