Room area calculator
Measure the room wall to wall, pick the unit, and get the area in both metric and imperial units.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter length, width and unit.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Area = length × width. Feet convert to meters by × 0.3048, and 1 ft² = 0.09290304 m² exactly. Perimeter = 2 × (length + width).
Example
Inputs: Length = 5, Width = 4, Unit = Meters. Result: Area: 20 m²; Area in square feet: 215.28 ft²; Perimeter: 18 m.
Limits and caveats
- Rectangular rooms only. For L-shaped rooms use the L-shaped room calculator.
- Built-in wardrobes and columns are not subtracted.
Questions about this tool
How do I measure a room accurately?
Measure at floor level wall to wall in two places and use the smaller value if they differ slightly.
How many square feet are in a square meter?
About 10.764, because one square foot is exactly 0.09290304 m².
Why is the perimeter shown?
It helps when buying skirting board or strip lighting that runs around the room.