Tile Calculator
Calculate how many tiles you need for any room. Enter room and tile dimensions to get tiles needed, area covered, and boxes required.
Tiles Needed
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Area Covered
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Boxes Needed
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Base Tiles
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What is Tile Calculator?
A tile calculator helps you estimate how many tiles you need to cover a floor or wall. It accounts for tile dimensions, room size, and a waste percentage to ensure you buy enough tiles without running short mid-project.
How to use
- 1 Enter the room length and width in your chosen unit (inches or cm).
- 2 Enter the tile length and width in the same unit.
- 3 Set a waste percentage — 10% is standard for most installations.
- 4 Click Calculate to see tiles needed, area covered, and boxes required.
- 5 Always buy at least 10% extra to account for cuts, breakage, and future repairs.
Formula
Example calculation
A 120 × 96 inch room (11,520 sq in) with 12 × 12 inch tiles (144 sq in) needs 11,520 / 144 = 80 tiles. With 10% waste: 88 tiles, or 9 boxes.
Frequently asked questions
What waste percentage should I use?
Use 10% for straight-lay patterns, 15% for diagonal patterns, and up to 20% for complex cuts or irregularly shaped rooms.
How many tiles come in a box?
This varies by tile size and manufacturer. The calculator assumes 10 tiles per box, but check your specific product's box count.
Should I measure in inches or cm?
Use whichever unit your tape measure uses, but be consistent — room and tile dimensions must be in the same unit.
Do I need extra tiles for grout lines?
Grout lines are typically 1/8 to 3/8 inch and have a negligible effect on tile count for most rooms. The waste percentage covers this.
Can I use this for wall tiles?
Yes. Just enter the wall height as the 'length' and wall width as the 'width' to calculate wall tile coverage.