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Calculate how many tiles or flooring planks you need for any room. Enter your room and tile dimensions, set your wastage allowance, and get exact quantities with adhesive, grout, and cost estimates.
Room Dimensions
Tile / Plank Size
Common sizes — click to select
Options
Wastage allowance
Extra tiles for cuts and breakages
Grout spacing
Gap between tiles in millimetres
Price (optional)
Price per square metre for tiles
Results
Tiles needed (with wastage)
Including 10% wastage
0
Tiles needed (exact)
0.0 tiles before rounding
0
Wastage tiles
Extra tiles for cuts and breakages
0
Total area to cover
Floor area of the room
0.00 m²
Area per tile
0.3600 m² per tile
3,600 cm²
Adhesive needed
0 × 20kg bags (~$0.00)
0.0 kg
Grout needed
0 × 5kg bags (~$0.00)
0.0 kg
Wastage by pattern
Straight lay uses ~10% wastage. Diagonal (45°) or herringbone patterns add 15–20%. Simple rectangular rooms with few cuts may only need 5%.
Quick reference — common tile sizes
| Size | Tiles per m² | Common use |
|---|---|---|
| 300 × 300mm | 11.1 | Bathrooms, splashbacks |
| 450 × 450mm | 4.9 | Bathrooms, laundry |
| 600 × 300mm | 5.6 | Feature walls, bathrooms |
| 600 × 600mm | 2.8 | Living areas, kitchens |
| 800 × 800mm | 1.6 | Open plan living |
| 900 × 450mm | 2.5 | Modern bathrooms |
| 1200 × 200mm | 4.2 | Wood-look planks |
| 1200 × 600mm | 1.4 | Large format |
Tiles per m² is approximate, based on tile area only (excluding grout spacing).
How to calculate tiles
Measure the length and width of the room in metres, then multiply them to get the total floor area in square metres. Divide the room area by the area of a single tile to get the number of tiles needed. Always add a wastage allowance (typically 10%) for cuts, breakages, and future repairs.
Wastage guide
Adhesive & grout
Use flexible adhesive for large format tiles (600mm and larger). Waterproof adhesive is required for wet areas such as bathrooms and laundries. Allow approximately 4 kg of adhesive and 0.5 kg of grout per square metre for standard 600×600 tiles with 3mm joints.
Tips
The formulas
Room area:
length (m) × width (m)
Tile area (with grout):
(W + grout) × (H + grout) / 1,000,000
Tiles needed:
room area / tile area
With wastage:
tiles × (1 + wastage%)
Tile buying guides
Browse tiles and flooring at Bunnings ↗ or Beaumont Tiles ↗ for pricing, stock, and tile size options.
To calculate how many tiles you need, start by measuring the room's length and width in metres. Multiply these together to get the total floor area in square metres. Next, calculate the area of one tile in square metres (width × height, converted from millimetres). Divide the room area by the tile area to get the number of tiles, then add a wastage allowance — typically 10% for a straight lay pattern. For example, a 5m × 4m room (20 m²) using 600×600mm tiles needs approximately 56 tiles before wastage, or 62 tiles with 10% added.
Wastage accounts for tiles that are cut to fit edges, tiles that break during cutting, and spare tiles for future repairs. A straight (grid) lay pattern in a simple rectangular room may only need 5–10% extra, while diagonal or herringbone patterns can require 15–20% due to more angled cuts. Rooms with many alcoves, doorways, or irregular shapes also need higher wastage. Always round up to whole boxes when buying, and keep a few spares — the same tile colour and batch may not be available later if you need replacements.