Floor Area Calculator
Calculate the area of a rectangular room in m² and ft². Free, fast and easy to use.
How it works
Multiply the length of the room by its width. For L-shaped rooms, split the floor into rectangles, calculate each one and add the results together.
Formula
A = L × W 1 m² ≈ 10.7639 ft²
Worked examples
- Length (m): 4.2 · Width (m): 3.5 → Area: 14.7 m²
- Length (m): 12 · Width (m): 8 → Area: 96 m²
Calculations run locally in your browser. Results are for information only — for engineering, electrical or financial decisions, verify the assumptions and applicable standards.
Frequently asked questions
How do I calculate the area of a room?
Multiply the length by the width. A room 4.2 m long and 3.5 m wide has an area of 14.7 m².
How do I convert m² to ft²?
Multiply by 10.7639. For example, 20 m² is about 215.3 ft².