Tile Calculator
Tile count for a floor, wall or shower. Pick the tile size and grout joint; the count includes the joint and 10% for cuts (15% for diagonal or herringbone layouts). Tile is sold by the box, so compare the square footage you need with the box coverage on the label.
Order 87 tiles — tile is boxed by the square foot (10–15 ft² per box); buy an extra box for future repairs.
- Area
- 80 ft²
- Unit 12×12″ + 0.125″ joint
- 0.98 per ft²
- Net tiles
- 78
- Waste / cuts 10%
- + 9
- Tiles to buy
- 87
- Thinset mortar, 50 lb
- 2 bags
- Grout, 25 lb
- 1 bags
- Materials + delivery$1.50–$6 / ft² · Sep 2026
- $120 – $480
- Installed (with labor)typ. $880
- $520 – $1,680
Quantities follow the ticket. Links may earn us a commission at no cost to you; they never change a number.
What will this tile job cost?
See the installed price range for these quantities and get up to 3 quotes from local contractors. Free, no obligation.
Common room sizes, answered
- How Much Tile for a 5×8 Room?40 ft²
- How Much Tile for a 6×8 Room?48 ft²
- How Much Tile for a 6×10 Room?60 ft²
- How Much Tile for a 8×10 Room?80 ft²
- How Much Tile for a 10×10 Room?100 ft²
- How Much Tile for a 10×12 Room?120 ft²
- How Much Tile for a 12×12 Room?144 ft²
- How Much Tile for a 12×15 Room?180 ft²
- How Much Tile for a 12×20 Room?240 ft²
- How Much Tile for a 15×15 Room?225 ft²
- How Much Tile for a 15×20 Room?300 ft²
- How Much Tile for a 20×20 Room?400 ft²
How to calculate tile by hand
Tiles = Area (ft²) ÷ [(L + joint) × (W + joint) ÷ 144] × (1 + waste)
Worked example
- Area: 10 ft × 8 ft = 80 ft².
- A 12 × 12″ tile with ⅛″ joints occupies 12.125² ÷ 144 = 1.02 ft² → 0.98 per ft².
- Net: 80 × 0.98 = 78.4 tiles; with 10% for cuts, 86.2 → 87 — about 8 boxes of 11.
- Also: thinset 80 ÷ 60 = 2 × 50 lb bags; grout 1 × 25 lb bag.
- 12 × 12″ tiles per ft²
- ≈ 1.0
- 12 × 24″ tiles per ft²
- ≈ 0.5
- 3 × 6″ subway per ft²
- ≈ 7.5
- Thinset, ¼″ square notch
- ≈ 60–80 ft² per 50 lb
Questions crews ask
How many tiles do I need?
Divide the area by the tile face plus grout joint. A 12 × 12″ tile with ⅛″ joints is about 1 per square foot, so a 10 × 8 ft floor needs 80, or 88 with 10% for cuts. Most 12 × 12″ tile comes 11 to a box (about 11 ft²), so that is 8 boxes.
How much extra tile should I buy?
10% for a straight layout in a rectangular room, 15% for diagonal, herringbone or a room with many corners, 20% for natural stone with colour variation. Keep a spare box — dye lots change and a cracked tile is otherwise unmatchable.
How much thinset do I need?
A 50 lb bag covers 60–80 ft² with a ¼″ square-notch trowel (12 × 12″ tile), 40–50 ft² with a ½″ notch for large-format tile, and 90–100 ft² with a 3/16″ V-notch for mosaics. The calculator uses 60 ft² per bag.
How much grout do I need?
It depends on joint width and tile size: a 25 lb bag does 100–150 ft² of 12 × 12″ tile with ⅛″ joints, but only 40–60 ft² of 3 × 6″ subway or ¼″ joints. The calculator uses 100 ft² per bag — buy two bags for small tile.
What grout joint size should I use?
1/16″ for rectified (precision-edged) porcelain, ⅛″ for standard ceramic and porcelain, 3/16–¼″ for handmade, rustic or natural stone tile. Wider joints hide size variation; narrower ones look cleaner and need less grout.