Room Area Calculator
Calculate floor, wall, and ceiling area for rectangular or L-shaped rooms.
100% client-side · no upload
Floor area
Total wall area
Ceiling area
Total surface area
How to use
- Enter the room's length and width in feet (measure to the interior walls).
- Enter the ceiling height — standard US homes are 8 ft; some have 9 ft or higher.
- Results show floor, wall, and ceiling area plus total surface area — useful for paint, insulation, and flooring estimates.
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Frequently Asked Questions
- Is this room area calculator free?
- Yes, completely free with no signup required.
- Does my data leave my device?
- No. All calculations happen in your browser — nothing is sent to a server.
- Does it work on mobile?
- Yes. The tool is mobile-first and works on any modern browser.
- How do I measure a room with an irregular shape?
- For L-shaped or irregular rooms, split the room into rectangles, calculate each area separately, and add them together. This tool handles one rectangle at a time.
- Why do I need wall area?
- Wall area is used to estimate paint, wallpaper, or insulation quantities. The total surface area is useful when ordering materials that cover all surfaces, like vapor barriers or radiant heating film.
Last updated: By jarvisbox