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Tile Calculator

Calculate how many tiles and boxes you need for any room. Choose common tile sizes, adjust waste factor, and get exact coverage estimates.

Quick Answer

Tiles Needed = (Room Area / Tile Area) x (1 + Waste %). A 10x12 ft room with 12x12 inch tiles needs about 132 tiles (120 + 10% waste). Always round up and buy extra tiles from the same batch for future repairs.

Calculate Tiles Needed

Enter your room dimensions and tile size.

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About This Tool

The Tile Calculator helps homeowners and contractors determine exactly how many tiles and boxes are needed for any floor or wall project. It accounts for tile size, room dimensions, waste factor, and box packaging to give you an accurate shopping list before heading to the store.

Choosing the Right Waste Factor

Use 10% waste for simple rectangular rooms with straight layouts. Increase to 15% for diagonal or herringbone patterns, rooms with many corners, or your first DIY tiling project. Complex layouts with curves or mosaic patterns may require 20% waste. The extra cost of waste tiles is minimal compared to making a second trip for more tiles from a potentially different lot.

Tile Size Selection Guide

Larger tiles make small rooms feel bigger and require less grout maintenance, but they need a very level subfloor. Smaller tiles like 6x6 work better for shower floors where you need slope for drainage. The current trend favors 12x24 and larger formats for their modern, clean aesthetic with minimal grout lines.

Pro Tips

Always dry-lay tiles before applying adhesive to verify the pattern and minimize cuts. Start from the center of the room and work outward so cut tiles at the edges are symmetrical. Purchase all tiles at once from the same lot number to ensure consistent color. Keep at least 3-5 extra tiles for future repairs.

Frequently Asked Questions

How do you calculate how many tiles you need?
Divide the total room area (length x width in square feet) by the area of one tile (tile width x tile height in square feet). Then add your waste factor (typically 10-15%). For example, a 10x12 ft room (120 sq ft) with 12x12 inch tiles (1 sq ft each) needs 120 tiles plus 10% waste = 132 tiles.
Why do I need a waste factor for tiles?
Waste accounts for cuts at walls and edges, breakage during installation, pattern matching, and future replacement tiles. A 10% waste factor is standard for simple layouts. Use 15% for diagonal patterns, complex room shapes, or large-format tiles which generate more cut waste at the edges.
What is the most common tile size?
The most popular floor tile size is 12x24 inches, offering a modern look with fewer grout lines. 12x12 remains common for its versatility. For walls, 3x6 subway tiles are the most popular. Larger formats like 24x24 are trending for open spaces as they create a seamless look with minimal grout.
How many tiles come in a box?
The number of tiles per box varies by size: 6x6 tiles typically come 44-48 per box, 12x12 tiles come 10-15 per box, 12x24 tiles come 6-8 per box, and 18x18 tiles come 4-6 per box. Always check the box label for exact count and total square footage coverage per box.
Should I buy extra tiles beyond the waste factor?
Yes. Buy 2-3 extra tiles beyond your calculated waste for future repairs. Tile lots (batches) can vary in color, so tiles purchased later may not match exactly. Store extras flat in a dry area. This small extra investment saves significant hassle if a tile cracks years later.

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