Tile Calculator | Floor & Wall Tile Square Footage Estimator

Q: How much extra tile should I order for waste?

Order 10% extra tile for standard straight or brick-joint layouts in rectangular rooms. For diagonal layouts (45-degree angle), rooms with multiple alcoves, or herringbone patterns, increase waste allowance to 15% to 18%. For intricate mosaic sheets or small hexagon tile, budget 20% waste for perimeter trimming.

Q: What is the difference between sanded and unsanded grout?

Use sanded grout for joint widths of 1/8-inch to 1/2-inch; the sand aggregate creates structural integrity and prevents shrinkage cracking as the grout cures. Use unsanded grout for narrow joints under 1/8-inch and on scratch-sensitive surfaces such as polished marble, glass tiles, or glazed ceramic.

Tile Dimension	Trowel Notch Size	Mortar Bag Yield	Grout Type
3″ × 6″ Subway	1/4″ × 1/4″ Square	80 – 90 sq ft	Unsanded (1/16″)
12″ × 12″ Square	1/4″ × 3/8″ Square	60 – 70 sq ft	Sanded (1/8″)
12″ × 24″ Format	1/2″ × 1/2″ Square	40 – 50 sq ft	Sanded / Polyblend
24″ × 24″ XL Slab	1/2″ × 1/2″ + Back Butter	35 – 45 sq ft	High-Performance

🔲 How Much Tile Do I Need?

Calculating how much tile do I need for your kitchen floor, shower walls, or bathroom remodel requires accurate surface measurements and an essential cutting waste factor. Unlike interior wall paint, rigid ceramic and porcelain tiles cannot bend around doorways, toilet flanges, or electrical outlets. Every perimeter wall and corner requires trimming, generating unrecoverable off-cuts.

The Tile Council of North America (TCNA) recommends ordering a minimum of 10% extra tile for simple rectangular rooms laid out in a straight grid or 1/3-offset running bond. If your design features a 45-degree diagonal layout or herringbone pattern, bump your allowance up to 15% to 18%. Intricate hexagon mosaics, curved shower curbs, or rooms with multiple alcoves require a 20% waste buffer to ensure you never run short on matching dye-lot tiles mid-project.

Quick Answer: How Many 12x12 Tiles Do I Need for 100 Square Feet?

Wondering how many 12x12 tiles do I need for 100 square feet? Exactly 100 tiles equal 100 net square feet. Applying the mandatory 10% cutting waste factor, you should order exactly 110 tiles (or 11 boxes if packaged 10 sq ft per box). This ensures you have matching tiles for wall cuts and attic replacement stock.

📐 Floor Tile Calculator: Square Footage & Box Estimator

Using our floor tile calculator, you can convert measured room dimensions into exact tile quantities and purchase cartons using standard architectural formulas:

Tile Piece Count Formula

Tiles = [Area (sq ft) ÷ (Length_in × Width_in ÷ 144)] × (1 + Waste%)

Our tile square footage calculator calculates individual tile surface area in square feet, divides total room area, and adds the cutting waste factor.

Carton Box Purchase Formula

Boxes = Math.ceil(Gross Sq Ft with Waste ÷ Sq Ft per Box)

Retail home centers sell tile by the box. If asking how many boxes of tile for 200 square feet (220 sq ft gross @ 16 sq ft/box), you need 14 full boxes.

Our built-in tile waste factor calculator automatically factors in pattern complexity, preventing costly mid-installation delays when tile distributors run out of matching batch runs.

📊 Tile Coverage Rates by Standard Sizes

Our tile coverage calculator benchmarks piece counts and standard carton packaging across popular residential tile formats:

Tile Dimensions	Sq Ft per Tile	Tiles per 100 Sq Ft (Raw)	Tiles Needed (+10% Waste)	Typical Box Yield
12″ × 24″ Format	2.00 sq ft	50 Tiles	55 Tiles	8 pcs (16.0 sq ft)
12″ × 12″ Square	1.00 sq ft	100 Tiles	110 Tiles	10 pcs (10.0 sq ft)
6″ × 24″ Wood Plank (or compare with LVP planks)	1.00 sq ft	100 Tiles	110 Tiles	12 pcs (12.0 sq ft)
3″ × 6″ Subway Tile	0.125 sq ft	800 Tiles	880 Tiles	80 pcs (10.0 sq ft)
4″ × 4″ Shower Tile	0.111 sq ft	900 Tiles	990 Tiles	90 pcs (10.0 sq ft)
24″ × 24″ Large Slab	4.00 sq ft	25 Tiles	28 Tiles	4 pcs (16.0 sq ft)

🍳 Subway Tile Calculator: Kitchen Backsplashes & Walls

When installing kitchen backsplashes with our subway tile calculator, vertical dimensions are measured in inches while cabinet runs are measured in feet. Standard American upper kitchen cabinets sit 18 inches above granite countertops, creating a 1.5-foot vertical band.

Traditional Running Bond 50% Brick Offset

The classic subway look. Each tile overlaps the joint below it by 50%. Standard 10% cutting waste is sufficient for straight walls and window returns.

Modern Vertical Stack Stacked Grid

Tiles aligned vertically and horizontally in continuous grid columns. Visually heightens ceiling space; requires precise laser level alignment and 10% waste.

Intricate 90° Pattern Herringbone Layout

Tiles placed at alternating 90-degree angles. Creates a luxury focal point behind cooktops but requires triangular cuts at all edges; mandatory 18% to 20% waste.

🥣 Grout & Thin-Set Mortar Coverage Calculator

A successful tile installation requires two essential bonding agents: polymer-modified mortar beneath the tiles and cementitious grout between them. Using our built-in thinset mortar calculator and grout calculator, you can eliminate guesswork when purchasing bagged materials.

How Much Thinset Mortar Per Square Foot?

Wondering how much thinset mortar per square foot is required? A 50-lb bag mixed with water yields approximately 0.45 cubic feet of wet mortar. With a 1/2-inch square-notch trowel (required for 12x24 large format porcelain), a bag covers 40 to 50 square feet (~1.1 lbs/sq ft). For smaller subway tiles using a 1/4-inch notch trowel, coverage expands to 75 to 90 square feet (~0.6 lbs/sq ft).

Tile Grout Joint Spacing Calculator

Our tile grout joint spacing calculator determines grout weight based on joint width. For standard 12x12 tiles with a 1/8-inch joint, budget 0.30 to 0.40 lbs per square foot. However, because 3x6 subway tiles have 4 times more joint seams per square foot, grout consumption doubles to 0.60 to 0.75 lbs per square foot.

💵 Tile Material & Installation Costs Per Square Foot

The overall tile cost per square foot varies widely by material selection, room preparation, and whether you hire a professional setter or DIY. Standard ceramic tile starts at $1.25 to $2.50 per square foot, while high-density glazed porcelain ranges from $2.50 to $6.00 per square foot. Luxury natural stone tiles (such as Calacatta marble, travertine, or slate) average $7.00 to $15.00+ per square foot.

Cost Breakdown for 150 Square Foot Bathroom Floor Installation

Porcelain 12x24 Floor Tile (165 sq ft gross @ $3.25/sq ft): $536
1/2″ Cement Backer Board Underlayment (10 sheets @ $14.50/sheet): $145
Polymer-Modified Thinset Mortar (4 bags @ $22.50/bag): $90
Stain-Resistant Polyblend Grout (2 boxes @ $16.00/box): $32
Leveling Clips, Spacers & Metal Edge Trim: $65
Total DIY Materials Cost: $868 ($5.78 / sq ft)
Turnkey Professional Tile Setter (Labor + Materials): $2,100 – $2,850 ($14.00 – $19.00 / sq ft)

For remodelers budgeting a master bath with our bathroom tile calculator, remember that cement backerboard and moisture-resistant gypsum panels should be estimated using our drywall sheet calculator, while topical waterproofing membranes (such as RedGard or Schluter Kerdi) add approximately $1.50 to $2.25 per square foot to wet area wall assemblies.

❓ Frequently Asked Questions

How much extra tile should I order for waste?

Order 10% extra tile for standard straight or brick-joint layouts in rectangular rooms. For diagonal layouts (45-degree angle), rooms with multiple alcoves, or herringbone patterns, increase waste allowance to 15% to 18%. For intricate mosaic sheets or small hexagon tile, budget 20% waste for perimeter trimming.

How many tiles are in a box?

Tile is sold by square footage rather than individual piece count, with most cartons containing 10 to 15 square feet. For example, a box of 12x24 inch porcelain tiles typically contains 8 pieces (16 sq ft), a box of 12x12 tiles contains 10 to 12 pieces (10–12 sq ft), and a carton of 3x6 subway tiles contains 80 to 100 pieces (10–12.5 sq ft).

How much thin-set mortar do I need for tiling?

A standard 50-lb bag of polymer-modified thinset mortar covers approximately 40 to 50 square feet when setting large format tiles (tiles with any side 15 inches or greater) using a 1/2-inch square-notch trowel. For standard 12x12 tiles using a 1/4-inch by 3/8-inch notch trowel, coverage averages 60 to 70 square feet per bag.

How much grout do I need per square foot?

For standard 12x12 inch tiles with a 1/8-inch grout joint, one 10-lb box of grout covers approximately 60 to 75 square feet (about 0.15 to 0.18 lbs of grout per square foot). Smaller tiles have significantly more joint seams per square foot: 3x6 subway tile with a 1/8-inch joint requires approximately 0.40 to 0.45 lbs of grout per square foot.

What is the difference between sanded and unsanded grout?

Use sanded grout for joint widths of 1/8-inch to 1/2-inch; the sand aggregate creates structural integrity and prevents shrinkage cracking as the grout cures. Use unsanded grout for narrow joints under 1/8-inch and on scratch-sensitive surfaces such as polished marble, glass tiles, or glazed ceramic.