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🔷 Tile Calculator
Count exactly how many floor or wall tiles you need for any room or area, with waste factor and custom sizes.
📐 Enter Your Dimensions
$/ea
📊 Your Results
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Tiles Needed (with waste)
Base Count (no waste)—
Waste Buffer—
Room Area—
Tiles per Sq Ft—
Estimated Cost
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Tile: $1–$15+/tile depending on type. Not including adhesive or grout.
How to Calculate How Many Tiles You Need
Tiling a floor or wall is a project where precision really pays off. Order too few tiles and you'll face the nightmare of trying to match a discontinued batch. Order too many and you've wasted money. Our tile calculator handles everything — area, tile count, and waste factor.
The Tile Formula
Tiles Needed = (Area ÷ Tile Area) × Waste Factor
Example: A 12×10 ft room (120 sq ft) with 12×12 tiles and 10% waste:
120 ÷ 1.0 = 120 × 1.10 = 132 tiles.
Understanding Waste Factor
- 10%: Standard rectangular room, straight/grid pattern
- 15%: Diagonal or herringbone pattern, L-shaped rooms
- 20%: Complex room shapes, irregular walls, beginner installer
Always store 5–10 tiles from your batch for future repairs — tile colors vary between batches and replacements may not match.
📐 Tile Sizes Guide
12×12: versatile, works in any room. 24×24: modern, fewer grout lines, makes rooms look larger. 6×6: great for backsplashes and small bathrooms. Subway (3×6, 4×12): popular for kitchens and showers.
💧 Grout Joint Width
For floor tiles, use ⅛"–¼" grout joints. For wall tiles, ⅛" is common. Rectified tiles (precision-cut) can use ⅛" or less for a seamless look.
Frequently Asked Questions
A 12×12 inch tile covers exactly 1 square foot. For 100 square feet with a 10% waste factor, you need 100 × 1.10 = 110 tiles. For a 15% waste factor (diagonal pattern), order 115 tiles.
Yes, always. Even experienced tile setters add 10% minimum. Cutting around corners, outlets, and doors always wastes partial tiles. For diagonal patterns, add 15–20%. Never round down — tile batches vary and you may not be able to match the color later.
Measure the length and width of the room at its longest and widest points in feet. Multiply to get total square feet. For L-shaped rooms, divide them into rectangles, calculate each, then add together. Our calculator handles rectangular areas — add room sections manually for complex shapes.
Contrary to old advice, larger tiles (16×16 or 18×18) can actually make a small bathroom look bigger by reducing the number of grout lines. 12×12 is a safe, versatile choice. Avoid very small tiles (less than 4×4) on the floor — they require more grout and more maintenance.