Tile Square Footage Calculator

Tiling a bathroom floor, kitchen backsplash, or walk-in shower requires estimating individual piece counts alongside total surface area. Ceramic, porc

Construction

Surface Area to Tile

sq ft

Total floor, shower, or backsplash area to be tiled

Tile Length

Nominal length of individual tile in inches (e.g. 12 in)

Tile Width

Nominal width of individual tile in inches (e.g. 12 in, 24 in)

Cutting & Breakage Allowance

Standard: 10% for straight grid; 15% for diagonal, subway offset, or herringbone

Tiles per Box (Optional)

Enter if sold in boxes (0 to calculate individual loose tiles)

Formula & Methodology

Tile Area (sq ft) = (Tile Length in × Tile Width in) ÷ 144 Theoretical Tiles Needed = Total Surface Area (sq ft) ÷ Tile Area (sq ft) Total Tiles to Order = ⌈Theoretical Tiles Needed × (1 + Waste % ÷ 100)⌉ Boxes to Order = ⌈Total Tiles to Order ÷ Tiles per Box⌉

Individual tile area in square inches is converted to square feet by dividing by 144 (since 1 sq ft = 144 sq in). Dividing room area by single-tile coverage yields the exact theoretical tile count. Multiplying by the waste allowance (standard 10%) accounts for perimeter cuts and saw breakage. The result is rounded strictly UP to the next whole tile.

Total Tiles to Order (Rounded Up)

110 tiles

Overview

Tiling a bathroom floor, kitchen backsplash, or walk-in shower requires estimating individual piece counts alongside total surface area. Ceramic, porcelain, natural stone, and mosaic tiles are manufactured in discrete dimensions (such as 12×12 in, 12×24 in, or 3×6 in subway tiles). This Tile Square Footage Calculator converts total installation square footage into the exact count of individual tiles to purchase, rounded up with a dedicated cutting and wet-saw breakage allowance.

Tiles break during wet-saw cutting, nibbling around toilet flanges, and 45-degree corner mitering. Tile installers recommend an absolute minimum of 10% waste for standard grid layouts and 15% for diagonal, brick-bond, or herringbone layouts.

Worked Examples

Example 1: 100 sq ft Floor with 12 in × 12 in Tiles & 10% Waste (Check Case)

Inputs: Area = 100 sq ft, Length = 12 in, Width = 12 in, Waste = 10%

Single tile area: (12 × 12) ÷ 144 = 1.00 sq ft.
Theoretical tiles needed: 100 ÷ 1.00 = 100 tiles.
Apply 10% waste factor: 100 × 1.10 = 110 tiles.
Round UP to whole integer: ⌈110.00⌉ = 110 tiles.

Final Answer: 110 tiles to order (100 net tiles + 10 reserve tiles)

Example 2: 60 sq ft Shower Wall with 12 in × 24 in Tiles & 10% Waste

Inputs: Area = 60 sq ft, Length = 24 in, Width = 12 in, Waste = 10%

Single tile area: (24 × 12) ÷ 144 = 2.00 sq ft.
Theoretical tiles: 60 ÷ 2.00 = 30 tiles.
Apply 10% waste: 30 × 1.10 = 33.00 tiles.
Round UP: ⌈33.00⌉ = 33 tiles.

Final Answer: 33 tiles to order (30 net tiles + 3 reserve tiles)

Example 3: 30 sq ft Kitchen Backsplash with 3 in × 6 in Subway Tiles & 15% Waste

Inputs: Area = 30 sq ft, Length = 6 in, Width = 3 in, Waste = 15%

Tile area: (6 × 3) ÷ 144 = 18 ÷ 144 = 0.125 sq ft per subway tile.
Theoretical tiles: 30 ÷ 0.125 = 240 tiles.
Apply 15% waste allowance: 240 × 1.15 = 276.00 tiles.
Total to purchase: ⌈276.00⌉ = 276 tiles.

Final Answer: 276 tiles to order (240 net tiles + 36 reserve tiles)

How to Use This Calculator

Enter the total surface area to be tiled in square feet.

Enter the nominal length and width of one individual tile in inches (e.g. 12×12, 12×24, 3×6).

Select your waste factor (10% for straight grid, 15% for diagonal or herringbone patterns).

Optionally enter the number of tiles packaged per box to get an immediate carton count.

Click Calculate to see total tiles needed, single-tile coverage, and box totals.

Reference Table

Tile Size (in)	Coverage / Tile (sq ft)	Tiles per 100 sq ft (Net)	10% Waste Total	15% Waste Total
12 × 12	1.0000	100	110 tiles	115 tiles
12 × 24	2.0000	50	55 tiles	58 tiles
24 × 24	4.0000	25	28 tiles	29 tiles
6 × 6	0.2500	400	440 tiles	460 tiles
3 × 6 (Subway)	0.1250	800	880 tiles	920 tiles
4 × 16 (Plank)	0.4444	225	248 tiles	259 tiles

Frequently Asked Questions

Do grout joint widths affect the tile calculation?

Grout joints (typically 1/16 in to 3/16 in) add a minuscule percentage of surface area, but tile sizing conventions include the joint within nominal dimensions. Applying a 10% waste factor safely covers any joint dimensional variance.

Why do large format tiles (like 24×24 in) need a higher waste factor?

Large format tiles produce larger scraps when trimmed. If you cut 4 inches off a 24-inch tile along a wall, the remaining 20-inch piece may not fit anywhere else in the layout, creating higher net waste.

How do I calculate bullnose or edge trim tiles?

Bullnose trim, pencil liners, and metal Schluter edge profiles are sold by linear foot, not square foot. Measure the perimeter edges of exposed tile boundaries separately.

What happens if I run short by just two tiles?

Tiles vary between kiln firings (dye lots and caliber sizes). Reordering weeks later often results in tiles that do not match in exact shade or size. Always purchase 10% to 15% extra upfront.

Can this tool calculate mosaic tile sheets?

Yes. Most mosaic tiles come mounted on 12×12 inch mesh backing sheets. Enter 12 in by 12 in as the tile dimensions to calculate the total number of mesh sheets needed.