Square Footage & Area Calculator
Enter the length and width of a room to get the area in m² and ft². Add a price per m² to estimate the cost of flooring, tiles or carpet including a 10% cutting allowance.
Square Footage & Area
Floor area in m² and ft², plus material cost
Area20.00 m²
Square feet215.3 ft²
With 10% waste22.00 m²
Material cost (incl. 10% waste)550.00
How it works
- Area = length × width.
- 1 m² = 10.764 ft².
- Add about 10% for cutting waste (15% for diagonal tile patterns).
- Split L-shaped rooms into rectangles and add the areas.
Worked example: 5 × 4 m room, flooring at 25 per m²
- 1Area: 5 × 4 = 20 m² (215.3 ft²).
- 2With 10% waste: 22 m².
- 3Cost: 22 × 25 = 550.
Buy 22 m² — about 550
Common room sizes
| Room | m² | ft² |
|---|---|---|
| 3 × 3 m | 9 | 96.9 |
| 4 × 4 m | 16 | 172.2 |
| 5 × 4 m | 20 | 215.3 |
| 6 × 5 m | 30 | 322.9 |
Frequently asked questions
How do I calculate square footage?
Measure length and width in feet and multiply. A 12 × 15 ft room is 180 ft².
How do I convert m² to ft²?
Multiply by 10.764. 20 m² is about 215 ft².
How much extra flooring should I buy?
About 10% for straight layouts and 15% for diagonal or herringbone patterns.
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