Tile Calculator
Calculate how many tiles you need for floors, walls, and backsplashes. Enter your room dimensions, tile size, gap width, and waste percentage to get precise tile counts, grout amount, and total cost estimate.
How to Calculate Tiles Needed
Follow these steps to calculate the number of tiles for your project:
- Measure the room: Measure the length and width of the area to be tiled in feet. For walls, measure wall height and width.
- Calculate total area: Multiply length by width to get total square footage.
- Determine tile coverage: Convert tile dimensions from inches to feet. Include grout width in the calculation to find the effective area each tile covers.
- Divide area by tile coverage: Total area divided by individual tile coverage equals the number of tiles needed.
- Add waste factor: Add 10% extra for straight layouts, 15% for diagonal or herringbone patterns, and 20% for complex patterns with many cuts.
- Calculate grout: Grout volume depends on tile size, grout joint width, and tile thickness. Our calculator estimates pounds of grout needed automatically.
Common Tile Sizes
- 1" x 1" (mosaic): Typically sold in 12x12 mesh sheets. Best for accent borders and shower floors.
- 4" x 4": Classic size for backsplashes and accent walls. 9 tiles per square foot.
- 6" x 6": Popular for backsplashes and small bathrooms. 4 tiles per square foot.
- 12" x 12": Standard floor tile. Approximately 1 tile per square foot.
- 12" x 24": Modern rectangular format. Popular for floors and walls. 0.5 tiles per square foot.
- 24" x 24": Large format for open spaces. 0.25 tiles per square foot.
Tile Layout Patterns and Waste Factor
- Straight lay (grid): Tiles aligned in rows and columns. Simplest pattern, least waste (add 10%). Good for beginners.
- Brick / running bond: Each row offset by half a tile. Slightly more waste (add 12-15%). Hides imperfections well.
- Diagonal (45 degrees): Tiles rotated 45 degrees. More cuts required (add 15-20%). Makes rooms appear larger.
- Herringbone: Tiles arranged in a V-shape. Most waste (add 15-20%). Elegant, high-end look.
- Basket weave: Alternating pairs of rectangular tiles. Moderate waste (add 12-15%). Classic, traditional look.
Grout Width Recommendations
- 1/16" (1.5 mm): Rectified (precision-cut) tiles only. Minimal grout lines for a seamless look.
- 1/8" (3 mm): Standard for most wall tiles and well-calibrated floor tiles.
- 3/16" (5 mm): Recommended for slightly irregular tiles and large format tiles.
- 1/4" (6 mm) or wider: Natural stone, handmade tiles, or rustic styles.
Tile Cost Guide by Material
- Ceramic: $1-$5 per sq ft. Most affordable, good for walls and light-traffic floors.
- Porcelain: $3-$10 per sq ft. Denser and more water-resistant than ceramic. Great for bathrooms and kitchens.
- Natural stone (marble, granite, slate): $5-$20 per sq ft. Premium look, requires sealing.
- Glass mosaic: $7-$30 per sq ft. Best for backsplashes and accent features.
- Cement/encaustic: $8-$15 per sq ft. Decorative patterns, requires sealing.
Tile for Different Applications
- Bathroom floors: Use slip-resistant rated tiles (coefficient of friction 0.42+). Porcelain or ceramic in 12x12 or 12x24 sizes.
- Kitchen backsplash: Subway tiles (3x6), mosaics, or 4x4 tiles. Choose easy-to-clean glazed surfaces.
- Shower walls: Porcelain or ceramic tile. Avoid natural stone in steam showers. Use waterproof membrane behind tiles.
- Entryways: Durable porcelain or natural stone. Choose dark grout to hide dirt.
- Outdoor patios: Porcelain pavers or natural stone rated for exterior use. Must be frost-resistant in cold climates.
Frequently Asked Questions
How many 12x12 tiles do I need per square foot?
You need approximately 1 tile per square foot when using 12x12 inch tiles with standard grout lines (1/8 inch). With grout lines factored in, you actually need slightly less than 1 tile per square foot, but always round up and add 10% for waste to ensure you have enough.
How much grout do I need per square foot?
Grout coverage depends on tile size, thickness, and grout joint width. For 12x12 inch tiles with 1/8-inch grout joints, you need approximately 1 lb of unsanded grout per 30-40 sq ft. For wider joints (1/4 inch or more), use sanded grout and plan for about 1 lb per 15-20 sq ft. A 25 lb bag covers 200-250 sq ft with standard 12x12 tiles.
What size tile is best for small rooms?
For small rooms, use medium-sized tiles (12x12 or 12x24 inches). Larger tiles have fewer grout lines, making the room appear bigger. Avoid very small tiles (like 1x1 mosaics) for the main floor as the many grout lines can make the space feel busy. Large format tiles (24x24) work if the room is at least 40 sq ft.
How much does tiling a floor cost?
Floor tiling costs vary by tile material and size. Ceramic tiles cost $1-$5 per sq ft, porcelain $3-$10, natural stone $5-$20, and glass mosaic $7-$30. Labor adds $5-$15 per sq ft. A typical 100 sq ft bathroom floor costs $600-$2,500 including materials and labor.
Should I use sanded or unsanded grout?
Use unsanded grout for joints narrower than 1/8 inch (3 mm). Use sanded grout for joints 1/8 inch or wider. Sanded grout is stronger and resists cracking in wider joints, while unsanded grout is easier to work into thin joints and is preferred for polished or scratch-prone tiles like marble.
How many tiles come in a box?
The number of tiles per box varies by size and manufacturer. Common counts: 12x12 tiles typically come 10-15 per box (10-15 sq ft), 6x6 tiles come 40-50 per box (10-12 sq ft), and 24x24 tiles come 4-6 per box (16-24 sq ft). Always check the box label for exact coverage.