Tile Calculator
Work out how many tiles a floor or wall needs, including a wastage allowance.
Processing: This tool runs entirely in your browser. Your input and any file you open stay on your device — nothing is uploaded to a server.
How to use the tile calculator
- Fill in the fields — they start with a worked example.
- Read the answer, and the arithmetic shown beneath it.
- Copy the results, or adjust the inputs to compare scenarios.
About this tool
The tile count is the area divided by the area of one tile, plus wastage. Wastage is not optional: tiles break, edges need cutting, and a diagonal layout wastes considerably more than a straight one. 10% is the usual allowance for a simple rectangular room, 15% where there are many cuts, and 20% for diagonal or herringbone patterns.
Buying the extra with the original order matters more than the cost — tile batches vary in shade, and a later top-up rarely matches exactly.
Common uses
- Ordering tiles for a bathroom or kitchen floor.
- Checking a supplier's quantity before ordering.
- Estimating boxes needed from a tile size.
Frequently asked questions
- How much wastage should I allow?
- 10% for a straightforward rectangular room, 15% with lots of cuts, and 20% for diagonal or herringbone layouts.
- Why buy extra tiles at the same time?
- Shade varies between production batches. A later purchase may not match, and keeping a few spares makes future repairs possible.
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