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Room Area Calculator

room-area-calculator

Calculate floor, ceiling, wall area and perimeter while subtracting doors and windows.

🛡 Privacy-first⚡ Fast🔓 No signup📱 Mobile friendly

Length (m)Width (m)Height (m)

Total openings (m²)

Dynamic diagram

⚠️ Results are estimates for takeoff and planning. Do not use them as a substitute for structural design, specifications or local building codes; consult a qualified professional when required.

💡 Useful information

Calculate room floor area, ceiling area, wall area and perimeter from length, width and height, subtracting openings.

Runs directly in a modern browser.
Works on phones and desktop computers.
Reuse it without creating an account.

ℹ️ How to use

Enter your data or choose the required file.
Adjust the available options.
Run the tool and review the result.
Copy or download the result when needed.

❔ Frequently asked questions

Does wall area include openings?

The gross wall area is calculated and the opening area you enter is then deducted.

Is ceiling area equal to floor area?

For a standard rectangular room, yes, unless the ceiling geometry differs.