Construction
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Tile Calculator.
Calculate tiles, area, and waste for flooring or walls
Set your values
Results update as you type.
Room Dimensions
Tile Details
Length of one side (assuming square tile).
Extra tiles for cuts and breakage (usually 10%).
Tiles Needed
132Including 10% waste buffer
FAQs
How do I calculate tiles needed?
Divide the total area of the room by the area of a single tile. If your room is 100 sq ft and your tiles are 1 sq ft (12x12), you need 100 tiles. Always add 10% for waste.
Why should I add a waste percentage?
Waste accounts for tiles that need to be cut to fit edges, accidental breakage during installation, and ensuring you have enough for future repairs. 10% is standard; 15% is safer for complex patterns.
How many tiles are in a box?
It varies by manufacturer and tile size. Many standard 12x12 tiles come 12 to a box, covering 12 sq ft. Check your specific tile packaging to adjust the box estimate.
How to Use the Tile Calculator
Planning a kitchen or bathroom renovation? This calculator helps you determine exactly how many tiles and boxes you need to buy, preventing multiple trips to the hardware store.
- Measure the length and width of the room or wall you want to tile.
- Enter the dimensions in feet or meters.
- Input the size of one side of your square tile (in inches).
- Select your waste percentage (10% is recommended for standard patterns).
- Review the total tiles and boxes required.
Tile Calculation Logic
We calculate area first, then divide by the coverage of a single tile.
Total Area
Calculates the total surface square footage (or square meters) to be covered.
Example:
Input: 10' x 12' room
Calculation: 10 × 12
Result: 120 sq ft
Tile Coverage
Converts tile inches to feet to find the square footage each tile covers.
Example:
Input: 12" x 12" tile
Calculation: (12/12) × (12/12)
Result: 1 sq ft
Quantity with Waste
Includes a 10% buffer for cuts, corners, and potential breakage during installation.
Example:
Input: 120 tiles needed
Calculation: 120 × 1.10
Result: 132 tiles
Common Tiling Projects
Versatile calculations for different home improvement tasks.
Bathroom Floor Renovation
Calculate standard ceramic or porcelain tiles for a moisture-heavy environment.
Kitchen Backsplash
Switch to smaller tile sizes to estimate the number of subway or mosaic tiles needed for a wall project.
Outdoor Patio
Use larger pavers or outdoor tiles for landscaping projects, adding a higher waste factor for irregular edges.
Professional Tiling Tips
Tips
- Always buy at least one extra box beyond the calculation for future repairs (tiles get discontinued).
- For diagonal or herringbone patterns, increase your waste factor to 15-20%.
- Check your tile boxes to ensure they all come from the same 'Lot' or 'Batch' for color consistency.
- If your room isn't a perfect rectangle, divide it into smaller sections and calculate each separately.
- Don't forget to factor in the thinset (adhesive) and grout, which are calculated separately.
Common Mistakes to Avoid
- Not accounting for the waste percentage, leading to a shortage of matching tiles.
- Mixing up metric and imperial units during initial room measurements.
- Forgetting to subtract areas where tiles won't go (e.g., under fixed cabinets).
Related Resources
Related Calculators
Cite this calculator
Canonical URL: https://mathify.one/en/construction/tile
Cite as: Mathify. (2026). Tile Calculator. https://mathify.one/en/construction/tile
Use Cases
Plan a flooring project
Determine how many tiles and boxes to buy for a new floor in a square or rectangular room, including extra for waste.
Example: A 12 ft x 10 ft room with 12-inch tiles and 10% waste.
Estimate tiles for a wall backsplash
Calculate the number of tiles needed for a rectangular wall area, such as a kitchen backsplash, accounting for waste.
Example: A 5 ft x 3 ft backsplash with 4-inch tiles and 15% waste.
Frequently Asked Questions
- How does the tile calculator estimate the number of tiles needed?
- The calculator uses the room's dimensions (length and width) to compute the total area. It then divides that area by the area of a single tile (which you input) to determine the number of tiles required. It also adds a waste percentage to account for cuts and breakage.
- What is the waste percentage and why is it important?
- The waste percentage is an extra amount of tiles added to your estimate to cover tiles that need to be cut to fit edges, or that may break during installation. A typical waste is 10%, but it can be higher for complex layouts or diagonal patterns. Including waste ensures you don't run short.
- Can I use this calculator for both flooring and wall projects?
- Yes, the calculator is designed for both flooring and wall projects. Simply enter the length and width of the area (for walls, use the wall's height and width) and the tile size. It works for any square or rectangular area.
Tips & Common Mistakes
Tips
- Measure the length and width of the area in the same units (e.g., feet or meters) to ensure accurate area calculation.
- Choose a waste percentage based on the complexity of the layout: 10% for straight layouts, 15-20% for diagonal or patterned installations.
- Always round up the number of boxes needed to the nearest whole box, as tiles are sold in boxes and you can't buy a fraction of a box.
- Double-check your tile size input: use the actual tile dimensions, not the nominal size, to avoid underestimating.
Common Mistakes to Avoid
- Forgetting to include a waste percentage, leading to a shortage of tiles if any are cut or broken.
- Mixing units (e.g., entering room dimensions in feet but tile size in inches) without converting, which results in an incorrect area calculation.
- Not accounting for irregular room shapes: this calculator assumes square or rectangular areas, so for L-shaped rooms, divide into rectangles and calculate separately.
Last updated: August 13, 2026