How to calculate square metres
Square feet = m² × 10.764
Metres = feet × 0.3048
For an L-shaped room, split it into two rectangles, work out each one and add them together. For a bay or alcove, add it as an extra rectangle.
Typical UK room sizes
| Room | Typical size | Area |
|---|---|---|
| Double bedroom | 3.6 × 3.0 m | 10.8 m² |
| Single bedroom | 2.7 × 2.1 m | 5.67 m² |
| Living room | 4.8 × 3.6 m | 17.28 m² |
| Kitchen | 3.6 × 3.0 m | 10.8 m² |
| Bathroom | 2.4 × 2.0 m | 4.8 m² |
Worked example
A 4.2 m × 3.6 m room is 15.12 m², about 162.8 sq ft. Flooring with 10% waste needs 16.63 m²; at £25 per m² that is about £415.80.
Tiling? Use the tile calculator. Painting the walls? Use the paint calculator.
Frequently asked questions
How do I work out square metres of a room?
Multiply the length by the width in metres. A 4 m by 3 m room is 12 m².
How many square feet are in a square metre?
10.764 square feet. To go the other way, divide square feet by 10.764.
How much extra flooring should I buy?
Usually 5% to 10% for laminate, vinyl and carpet, and 10% to 15% for tiles or diagonal layouts.
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Last updated October 2026.