Tile Calculator
Estimate tile count from room size, tile size, and waste percentage.
This tile calculator (a tile estimator) determines how many tiles you need for a floor or wall, given the room's area, the size of each tile (including a common m2 calculator tiles metric unit option), and a waste buffer for cuts and breakage.
Enter the room dimensions and tile size, and the calculator returns the number of tiles and boxes needed.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 120 sq ft room, 1 sq ft tiles, 10% waste | 132 tiles | Base count = 120 ÷ 1 = 120. With waste: 120 × 1.10 = 132 tiles. |
| 200 sq ft room, 2 sq ft tiles (diagonal layout), 15% waste | 115 tiles | Base count = 200 ÷ 2 = 100. With waste: 100 × 1.15 = 115 tiles. |
Calculating Tiles Needed
Divide the total room area by the area of a single tile to get the base tile count, then multiply by (1 + waste percentage) to account for cuts, breakage, and pattern matching - typically a 10% buffer for straight-laid tile and up to 15-20% for diagonal layouts.
Working in Square Meters vs. Square Feet
Tile sizes are often listed in centimeters or a tiles square meter calculator format outside the U.S., while American suppliers typically use inches and square feet - this calculator converts between the two so the tile count comes out correct regardless of which unit your tile packaging uses.
How to Use the Tile Calculator
- Open the Tile Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the tile calculator works.
Frequently Asked Questions
How do I calculate how many tiles I need for a room?
Divide the room's total area by the area of a single tile, then add a waste buffer of about 10% (or more for diagonal layouts) to cover cuts and breakage.
How does a tile calculator m2 conversion work?
If your tile size is listed in centimeters, convert it to square meters first, then divide the room's area in square meters by the tile's area in square meters to get the base tile count.
How much extra tile should I order for waste?
A 10% buffer is standard for straight-laid tile; diagonal layouts or intricate patterns often need 15-20% extra to account for the additional cuts required.
How do I use this tile calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Tile Calculator calculate?
Estimate tile count from room size, tile size, and waste percentage. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this tile use?
The formula is: tiles = area / tile area * (1 + waste). Ceramic and porcelain tile manufacturing became industrialized in the 19th century, with standardized tile sizing developing alongside mass production - the waste allowance in this formula (commonly 10%) accounts for cutting loss around room edges and pattern layouts, a practical necessity architects and installers have accounted for since large-scale tile installation became common in the early 20th century.
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Last updated: September 27, 2026.