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Tile Calculator for Floor & Wall Tile, Boxes & Grout

Calculate ceramic, porcelain, and subway tiles needed with box counts, grout weight, and waste allowance.

Quick Answer:To calculate tiles: divide room area (in sq ft) by the area of a single tile (length × width / 144), add 10% to 15% waste, and divide by tiles per box.

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How to Use the Tile Calculator (Floor & Wall Tiles, Boxes & Grout)

1Enter the length and width of the floor or wall area in feet.
2Enter the tile dimensions in inches (e.g. 12x12, 12x24, or 3x6 subway tile).
3Set your grout line width (standard is 1/8 inch or 1/16 inch).
4Enter the packaging count (tiles per box) to get exact box ordering requirements.

Formula & How It Works

TCNA Tile Coverage Method

Tiles = ⌈(L × W) / ((tileL × tileW) / 144) × 1.10⌉

Tile Area (sq ft) = (Tile Length × Tile Width) / 144. Total Tiles = ⌈(Area / Tile Area) × (1 + Waste)⌉. Boxes = ⌈Total Tiles / Tiles Per Box⌉. Grout = Area × 0.3 lbs/sq ft.

Worked Examples

10x12 Kitchen Floor with 12x12 Tiles

Input: 12' L × 10' W (120 sq ft), 12" × 12" Tiles, 10% Waste, 10 tiles/box

Explanation: 120 sq ft / 1 sq ft per tile = 120 tiles + 10% waste = 132 tiles. 132 / 10 = 14 boxes.

Result: 132 tiles (14 boxes), ~36 lbs grout

Bathroom Floor with 12x24 Porcelain Tiles

Input: 8' L × 6' W (48 sq ft), 12" × 24" Tiles, 8 tiles/box

Explanation: Each 12x24 tile is 2.0 sq ft. 48 / 2 = 24 tiles + 10% waste = 27 tiles.

Result: 27 tiles (4 boxes)

Subway Tile Kitchen Backsplash (3x6 in)

Input: 15' L × 2' H (30 sq ft), 3" × 6" Tiles

Explanation: Each 3x6 tile covers 0.125 sq ft. 30 / 0.125 = 240 + 15% = 264 tiles.

Result: 264 tiles (15% waste due to staggered subway brick pattern)

Frequently Asked Questions

How many tiles do I need for a 10x10 room?▼

For a 10x10 room (100 sq ft) with 12x12-inch tiles, you need approximately 110 tiles including a 10% cutting waste buffer.

How much extra tile should I order for waste?▼

Order 10% extra for standard grid layouts, and 15% to 20% extra for diagonal, herringbone, or chevron patterns.

How do I calculate tiles per box?▼

Check the manufacturer label on the box. Common 12x12 tiles usually come in boxes of 10 or 12 tiles.

How much grout do I need?▼

A common estimate is 0.2 to 0.4 lbs of dry grout per square foot, depending on tile thickness and joint width.

What grout joint width should I choose?▼

Rectified porcelain tiles can use thin 1/16-inch joints; standard ceramic tiles usually use 1/8 to 3/16-inch joints.

Are my room dimensions kept private?▼

Yes, all estimations run 100% locally in your web browser.

Quick Reference & Conversion Table

Tile Size	Single Tile Area	Tiles per 100 sq ft (no waste)	Tiles per 100 sq ft (+10% waste)
3" × 6" (Subway)	0.125 sq ft	800 tiles	880 tiles
6" × 6"	0.25 sq ft	400 tiles	440 tiles
12" × 12"	1.00 sq ft	100 tiles	110 tiles
12" × 24"	2.00 sq ft	50 tiles	55 tiles
24" × 24"	4.00 sq ft	25 tiles	28 tiles

⚠️ Common Pitfalls to Avoid

•Failing to account for tile pattern waste: diagonal and herringbone layouts require 15% to 20% waste instead of standard 10%.
•Ordering the exact square footage without extra tiles for future plumbing repairs or tile breakage.
•Mixing tile dye lots by purchasing boxes separately across multiple stores.

💡 Practical Real-World Uses

•Bathroom shower walls and wet-room floor installations.
•Kitchen ceramic backsplashes and entryway porcelain tile renovations.
•Commercial vinyl composition tile (VCT) commercial flooring estimation.

Ceramic Tile vs Porcelain Tile

✓Ceramic tile is softer, easier to cut with manual snap cutters, and cost-effective for indoor dry wall backsplashes.
✓Porcelain tile is fired at higher temperatures with denser clay (<0.5% water absorption), making it frost-proof and mandatory for high-traffic floors and outdoor patios.

Last reviewed & updated: 2026-11-01

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