🔲 Tile Calculator
Estimate tile quantity for floors, walls, and backsplashes accurately.
What is this tool?
A tile calculator is an essential tool for anyone planning a tiling project, whether you are installing a kitchen backsplash, retiling a bathroom floor, or laying porcelain tiles across an entire living space. It takes the guesswork out of material estimation by calculating exactly how many tiles you need based on the area to be covered, the size of each tile, and a waste allowance for cuts and breakages. Buying too few tiles means having to place a second order and risking a dye-lot mismatch where the new tiles look slightly different from the original batch. Buying too many ties up your budget in surplus material that may never be returned. Professional tilers typically add a 10 to 15 percent waste factor for standard layouts and up to 20 percent for diagonal patterns or intricate designs, because these require more cuts and generate more unusable offcuts. This calculator lets you adjust the waste percentage to match your specific installation pattern and skill level.How it works
The calculator works by first determining the total floor or wall area from the length and width you enter. It then calculates the area of a single tile based on the tile dimensions you provide. The number of tiles needed equals the total area divided by the area of one tile, multiplied by the waste factor expressed as a decimal plus one. For example, with a 10 percent waste factor, the multiplier is 1.10. The formula is: tiles needed = (total area divided by single tile area) times (1 plus waste percent divided by 100). The result is rounded up to the next whole number since you cannot purchase partial tiles.How to use
- Measure the length and width of the area you plan to tile in the same units (feet or inches). For irregular shapes, break the area into rectangles and measure each separately.
- Enter the tile dimensions. Common tile sizes include 12x12 inches, 18x18 inches, and 24x24 inches for floors, and 4x4 inches or 3x6 inches for walls.
- Set the waste percentage. Use 10 percent for straight lay patterns, 15 percent for staggered patterns, and 20 percent for diagonal or herringbone layouts.
- Click Calculate to see the total number of tiles needed. Always round up and consider buying a few extra boxes for future repairs.
- Check the coverage per box at your tile supplier and divide the total tile count by tiles per box to determine how many boxes to order.
Frequently Asked Questions
Frequently Asked Questions
How many 12x12 tiles do I need for 100 sq ft?
Each 12 by 12 inch tile covers exactly 1 square foot, so for 100 square feet with a 10 percent waste factor, you need 110 tiles. This accounts for cuts around edges, corners, and obstacles where partial tiles are used.
How much extra tile should I buy for waste?
For straight lay patterns, add 10 percent. For staggered or brick patterns, add 15 percent. For diagonal, herringbone, or chevron patterns, add 20 percent. More complex patterns generate more offcuts that cannot be reused elsewhere.
Should I buy extra tiles for future repairs?
Yes, always buy 1 to 2 extra boxes beyond your calculated needs and store them safely. Tile patterns and colors are often discontinued, making it impossible to find an exact match years later when a tile cracks and needs replacement.
How do I calculate tiles for multiple rooms?
Calculate each room separately and add the totals together. Alternatively, measure the combined area of all rooms and enter it as a single measurement. Use the higher waste percentage if the rooms have different layout complexities.
Tips & Advice
Always order all your tiles from the same batch and dye lot to ensure color consistency across the entire installation. Check the tiles for caliber and shade markings on the packaging, as tiles from different calibers can have slight size variations that affect grout line alignment. Before starting installation, lay out a dry run of tiles to visualize the pattern and identify where cuts will fall. Plan your layout so that cut tiles at edges are at least half a tile wide for a professional appearance. For large-format tiles, consider that they may require a flatter subfloor to prevent cracking.