Square Footage Calculator — ft² and m²
Multiply a rectangle’s length and width and show both square feet and square metres. The tool suits a simple floor section; divide irregular spaces into separate shapes before calculating.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
How to use this tool
Enter positive dimensions in the same unit and select feet or metres. Ceiling height does not belong in a floor-area product, and twelve feet six inches should be entered as 12.5 feet.
Results and examples
A ten-by-twelve-foot room is 120 square feet, approximately 11.15 square metres. An L-shaped room can be split into two non-overlapping rectangles whose areas are then added.
Limitations
- Wall thickness, built-in fixtures and shared areas are not removed automatically.
- Official area definitions and measurement uncertainty require separate review.
Fields
| Field | Guidance and constraints |
|---|---|
| Length | Accepted range: 0.001–1000000 · Input step: 0.01 |
| Width | Accepted range: 0.001–1000000 · Input step: 0.01 |
| Unit | Feet / Metres |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
What is the area of a ten-by-twelve-foot room?
A ten-by-twelve-foot room is 120 square feet, approximately 11.15 square metres. An L-shaped room can be split into two non-overlapping rectangles whose areas are then added.
How do I handle an L-shaped space?
Wall thickness, built-in fixtures and shared areas are not removed automatically. Official area definitions and measurement uncertainty require separate review.
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