Tile Calculator Calculators
Work out how many tiles a floor or wall needs, including the wastage everyone forgets.
Tile Calculator is a free online tool that work out how many tiles a floor or wall needs, including the wastage everyone forgets. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Calculators
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- plain JavaScript
- Settings
- 8
- Works offline
- Yes, after the first visit
About Tile Calculator
Two things make tile estimates wrong, and both are here. The grout gap belongs to each tile’s footprint — a 300×600 tile with a 3mm joint actually occupies 303×603, which is about 1% fewer tiles per square meter than the bare size suggests. And wastage is not optional: straight tiling loses roughly 10% to cuts, while diagonal and herringbone layouts lose 15–20% because nearly every perimeter tile is cut at an angle.
How to use it
- Enter area width, area length and tile width.
- Adjust the remaining 5 settings if the defaults do not fit your case.
The 8 settings
| Setting | What it does | Default |
|---|---|---|
| Area width | Range 0.1–100m. | 4m |
| Area length | Range 0.1–100m. | 3m |
| Tile width | Range 10–2000mm. | 300mm |
| Tile length | Range 10–2000mm. | 600mm |
| Grout gap | Range 0–20mm. | 3mm |
| Wastage | Range 0–25%. | 10% |
| Tiles per box | Range 1–200. | 8 |
| Price per box | Range 0–10000. | 32 |
Under the hood
| Runs on | plain JavaScript — runs the whole thing |
| Controls | Area width, Area length, Tile width, Tile length, Grout gap, Wastage, Tiles per box, Price per box |
Questions
How much wastage should I allow?
10% for a straight layout in a square room. 15% if the room has alcoves, pipe boxing or an awkward shape. 20% for diagonal or herringbone, where almost every edge tile is an angled cut. Large-format tiles waste more than small ones, because each mistake costs more area.
Why does buying exactly enough go wrong?
Tiles are made in batches and batches vary in shade. A second order weeks later can arrive visibly different, and part-tiling a floor in two shades is not a fixable problem. Buying the spare up front, from the same batch, is the whole point.
Should I keep the leftovers?
Yes — a box in the loft is the difference between replacing one cracked tile and re-tiling a room. Batch shade is exactly as much of a problem for a repair in three years as it is for the original job.