Quick answer: A 5 m × 4 m room is 5 × 4 = 20 m², which is 20 ÷ 0.09290304 = 215.28 ft².
How it's calculated
Rectangle: length × width. Circle: π × (diameter ÷ 2)². Triangle: ½ × base × height. Trapezoid: ½ × (side a + side b) × height, where a and b are the two parallel sides.
For an L-shaped room, split it into two rectangles and enter the second one as Room 2. All dimensions must be in the same unit.
One square foot is exactly 0.09290304 m² (1 ft = 0.3048 m), so square metres × 10.7639 = square feet. A square yard is 9 ft².
Worked examples
- Room 5 m × 4 m: 20 m² = 215.28 ft²
- Round majlis rug area, 3 m diameter: π × 1.5² = 7.07 m²
- Room 12 ft × 10 ft plus 8 ft × 6 ft: 120 + 48 = 168 ft² = 15.61 m²
Square metres to square feet
| m² | ft² |
|---|---|
| 1 | 10.76 |
| 10 | 107.64 |
| 20 | 215.28 |
| 50 | 538.2 |
| 100 | 1,076.39 |
| 150 | 1,614.59 |
| 200 | 2,152.78 |
| 300 | 3,229.17 |
| 500 | 5,381.96 |
Frequently asked questions
How do I convert m² to square feet?
Multiply by 10.7639 (or divide by 0.09290304). 100 m² is 1,076.39 ft².
How do I measure an L-shaped room?
Split it into two rectangles, measure each, and add the areas. Enter one as Room 1 and the other as Room 2.
Is built-up area the same as floor area?
No. Developers in the Gulf often quote built-up or saleable area, which includes walls, balconies and a share of common areas. Measuring inside the rooms gives the usable (carpet) area.
How do I measure a room with an alcove or bay?
Measure the main rectangle, then the alcove as Room 2, and add them up. If the bay is curved, a half circle is π × radius² ÷ 2.
How do I work out the cost of flooring?
Type in the price per square metre (or square foot) and the calculator multiplies it by the area. Order about 10% extra for cutting.
How do I measure an irregular plot of land?
Break it into rectangles and triangles, work out each piece and add them. For land, though, the area on the title deed or survey plan is the official one.