Square Meter Calculator
A 4 m by 3 m room covers 12 square meters, which is 129.17 square feet. This square meter calculator multiplies length by width in meters and shows the same area in square feet for room planning, flooring quotes, and material checks.
Quick answer
Square meters measure area for rectangular rooms, slabs, and floor sections.
What this tells you
- •Square meters measure area for rectangular rooms, slabs, and floor sections.
- •Enter both dimensions in meters to get the area in m².
- •The secondary result converts the same footprint to square feet at 10.7639 ft² per m².
- •For L-shaped rooms, calculate each rectangle separately and add the totals.
How to Use
- 1Measure the room or surface length in meters.
- 2Measure the perpendicular width in meters.
- 3Enter both numbers and calculate the area.
- 4Use the square-foot result when a supplier quotes flooring or paint coverage in imperial units.
How It Works
Formula
Area (m²) = Length (m) × Width (m)
Area (ft²) = Area (m²) × 10.7639This tool uses the rectangle area formula only. Multiply the measured length by the measured width to get square meters, then multiply that area by 10.7639 to show the same footprint in square feet.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Bedroom floor area
A 4 by 3 meter bedroom has 12 square meters of floor area. That is the number most tile and laminate suppliers need before you add waste.
Laminate flooring quote
A family room that measures 5.5 meters by 4.2 meters covers 23.10 square meters. The square-foot conversion helps when the box coverage or installer quote is listed in square feet.
Garage slab section
A rectangular slab section at 7.25 by 6 meters covers 43.50 square meters. Use the same approach for each bay if the slab layout steps in or out.
Common Room Sizes in Square Meters
Quick checks for rectangular rooms measured in meters.
| Room size | Square meters | Square feet |
|---|---|---|
| 3 m × 3 m | 9.00 m² | 96.88 sq ft |
| 4 m × 3 m | 12.00 m² | 129.17 sq ft |
| 5 m × 4 m | 20.00 m² | 215.28 sq ft |
| 6 m × 4 m | 24.00 m² | 258.33 sq ft |
These examples assume a simple rectangle with no alcoves, closets, or curves.
Common mistakes
- Mixing meters and feet in the same calculation
- Using wall length from one room section and width from another
- Forgetting to split an L-shaped room into separate rectangles
- Ordering flooring from the area result without adding waste for cuts and offcuts