Tile Calculator
Use our free tile calculator to quickly estimate how many tiles you need and the total tile area, based on key inputs like room length and width, tile dimensions, and an allowance for waste. Perfect for homeowners, renovators, and tiling contractors.
Tile Formula
Knowing how to calculate tile quantity prevents underordering (project delays) and overordering (waste and cost). This formula gives a practical tile count including cutting and breakage allowance. Not a fan of doing the math? Skip the manual work and plug your numbers into our free Tile Calculator—you'll get instant, accurate tile counts and area totals.
How this tile calculator works
This calculator converts your room dimensions into a total area, then divides that by a single tile's coverage area to find the raw tile count. It then applies a waste percentage (for cuts, breakage, pattern matching) and rounds up to the nearest whole tile. Use the waste field to account for complex patterns, diagonal layouts, or high breakage risk.
When to use this Tile Calculator
When ordering tiles for a bathroom, kitchen, or full-floor renovation
To estimate material quantities for quotes and bids
When planning tile layouts that require extra waste (diagonals/patterns)
To compare tile sizes (larger tiles reduce grout lines but may increase waste on small rooms)
For quick pre-purchase checks before visiting the supplier
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Average Tile Amounts by Project Type
Understand typical tile coverage and waste allowances used in projects. Use these as starting points and adjust for your site conditions and layout complexity.
Standard layout
Complex layout/diagonal
High breakage/trim
These benchmarks help homeowners and contractors evaluate ordering quantities and reduce surprises at installation.
Frequently Asked Questions
This calculator provides a reliable preliminary estimate using your inputs and a waste allowance. Final counts can change after site measurements and layout decisions.
For straight-lay installations use 5–10%. For diagonal or patterned layouts use 10–15%. Increase allowance for irregular rooms or heavy cutting.
Yes. Always round up to the next whole tile—tiles can't be purchased in fractions.
Yes. Use the same area formula for walls (height × width) and treat each surface separately.
Convert tile dimensions to the same length units as the room (e.g., cm → m) before computing tile area. The calculator can accept mixed units if the widget handles conversions.
Grout lines slightly reduce coverage per tile but are typically negligible for tile count. For very small tiles or mosaic sheets, factor that into tile area or add a small additional waste percent.
Yes—keeping a box of spare tiles is recommended for future repairs. Consider saving an extra 5% beyond immediate waste for spare stock if the tile is discontinued.
No. This tool estimates tile quantity and area only. Use a separate materials and labor calculator to estimate adhesives, grout, and installation costs.