18x18 & 9x9 Pinwheel Tile Pattern Calculator
This layout repeats a 27x18 module of two tiles in two sizes — one 18x18 and one 9x9. It belongs to the Pinwheel family — see Pinwheel / Hopscotch Pattern for the reference layout. The 18x18 tile it uses also stands on its own — 18x18 Tile Pattern.
18x18 & 9x9 Pinwheel
Opuslay — tile layout worksheet- Room:
- 3 m × 2.5 m
- Units:
- Metric (cm / m²)
- Anchor:
- Left · Top
- Layout angle:
- Straight
- Tile colours:
- Single colour
Material breakdown
| Format | Qty / Pattern | Share | Qty / Room | Area / Room |
|---|---|---|---|---|
| 45x45 cm | 1 | 80.0% | 39 | 5.99 m² |
| 22.5x22.5 cm | 1 | 20.0% | 33 | 1.51 m² |
| Total | 2 | 100% | 72 | 7.50 m² |
What you'll need to buy
Tiles to buy
| 22.5x22.5 cm | 33 tiles | 1.67 m² |
| 45x45 cm | 36 tiles | 7.29 m² |
Total 69 tiles · 8.96 m² (incl. 19% cuts & breakage)
Adhesive & grout
- Thin-set adhesive: ≈ 40.5 kg (2 × 50 lb bags) — recommended trowel: 12mm notch, large format
- Grout — the tile sets the joint width, not you:
- ≈ 1.8 kg (1 × 10 lb bag) — 3mm joint, rectified / tight-set tile
- ≈ 3.0 kg (1 × 10 lb bag) — 5mm joint, natural or non-rectified tile
Adhesive: allow a little over on an uneven substrate, or if you back-butter large tiles — both eat more than a flat bed.
Grout: the 25 lb bag is the usual size (10 lb for small jobs). Buy it in one go and stick to a single bag size: bags from different batches can dry to slightly different shades.
It's the tile that decides the joint, not the setter — dry-lay a section to find your width. Assumes 9.5mm tile depth; adjust for your product — thicker tiles need more.
Share & export
Save the 18x18 & 9x9 Pinwheel layout to your moodboard, or send the link to your tiler — it reopens with your room dimensions.
