Tile Calculator

Count the tiles and boxes you need for a floor, wall or backsplash, including grout joints and cutting waste.

Feet + inches
Sourced data
No sign-up

Calculator

Length

Width

Tile size

Grout joint

Waste

Tiles per box (optional)

pcs

Price per sq ft (optional)

Tiles needed

39 tiles cover 80 sq ft, plus 10% for cuts

Tile area to buy: 88 sq ft

Large-format tiles (any side 15" or longer) need a large-and-heavy-tile mortar and a flat floor. Check the flatness tolerance on the box.

How it works Formula, reference tables and pro tips

Tiles per square foot

Tile size	Tiles per sq ft	Tiles per 100 sq ft (+10%)
4" × 4"	9.00	991
6" × 6"	4.00	441
3" × 6"	8.00	881
12" × 12"	1.00	111
12" × 24"	0.50	56
18" × 18"	0.44	49
24" × 24"	0.25	28

Without grout joints. The calculator includes the joint you choose, which slightly lowers the count.

Measuring walls and backsplashes

Walls: width × height of each wall, minus windows and doors.
Backsplash: length of the counter run × height from countertop to the bottom of the upper cabinets (often about 18 inches).
Shower: add each wall separately and the floor, which often uses a different, smaller tile.

Waste by layout

Layout	Extra
Straight / grid	10%
Offset or diagonal	15%
Herringbone	20%

Quick answers

How do I calculate how many tiles I need?

Find the area in square feet, convert it to square inches (× 144) and divide by the area of one tile plus its grout joint. Then add 10% for cuts and breakage, or 15–20% for diagonal and herringbone layouts.

How many 12×24 tiles do I need for 100 square feet?

Each 12 × 24 tile covers 2 sq ft, so 100 sq ft needs 50 tiles (a few less once grout joints are counted). With 10% extra, buy 55 tiles.

What size grout joint should I use?

Rectified tiles with straight edges can use joints as narrow as 1/16"–1/8". Non-rectified tiles and natural stone usually need 3/16"–1/4" to absorb size variation. Check the tile maker's recommendation on the box.

Should I buy extra tile?

Yes. Besides the waste for cuts, keep a few spare tiles from the same lot for future repairs. Discontinued tiles and different production lots are very hard to match later.

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These calculators give estimates for planning and shopping. Product yields, densities and coverage vary by brand and site conditions, so check the label and your supplier. For structural work, follow your local building code and permit requirements.