Tile Calculator
Work out how many tiles you need for a floor or wall including wastage allowance, free and instant right in your browser.
Enter Values
Minimum 0
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the area length and width, and the tile size.
- Optionally set the grout joint (the gap between tiles) and a waste percentage, then Calculate.
How it works
The area is length × width. Each tile is treated as its size plus one grout joint, so it covers (tile length + joint) × (tile width + joint). Dividing the area by that gives the tile count, then a waste allowance is added for cuts and breakages.
Worked example
2 m × 3 m floor, 500 × 500 mm tiles, 3 mm grout, 10% waste. Each tile covers about 0.253 m², so 6 m² needs ~24 tiles, plus waste = 27 tiles.
Common mistakes
- Skipping the waste allowance — cuts and breakages mean you need more than the bare area suggests.
- Entering tile size in metres while it's actually in millimetres (a 500 mm tile is 0.5 m).
Frequently asked questions
Does the grout joint change the count?
Slightly — a wider grout joint means each tile covers a bit more area, so you need marginally fewer tiles. The default is 3 mm.
How much waste should I allow?
10% is typical; allow more for diagonal layouts or patterns.
Related tools
- Brick Wall Calculator
- Paint Quantity Calculator
- Concrete Slab Volume Calculator
- Paver Calculator
- Plasterboard Sheets Calculator
- Cost per Square Metre Calculator
Explore more in Civil Construction, Building Materials & Trades.
Cite this tool
Zerdly. (2026). Tile Calculator. Retrieved from https://www.zerdly.com/tools/tile-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.