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Room Area Calculator
Find the exact floor area of a room for flooring, paint or heating.
The area is length × width, and the perimeter is 2 × (length + width). This is the starting point for most renovation estimates.
How it works
The area is length × width, and the perimeter is 2 × (length + width). This is the starting point for most renovation estimates.
Worked example
A room of 5 m × 4 m has an area of 20 m² and a perimeter of 18 m.
Recommendations
- Measure at the baseboards, not mid-wall, for accuracy
- Round up your result to the nearest 0.5 m²
- Double-check diagonal measurements for very old buildings
Tips & advice
- Use a laser measure for large rooms
- Record measurements with photos for later quotes
- Include alcoves and bay windows in the total
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Room Area Calculator
Find the exact floor area of a room for flooring, paint or heating.
Use the calculatorInvoice Generator FAQs
Yes, all 20 home calculators are 100% free, private and run entirely in your browser. No account needed.
They use standard industry formulas. Always round up for materials and confirm with a professional for structural work.
The calculators use metric units (meters, liters, m³). Convert imperial measurements beforehand if needed.
No. Calculations happen instantly in your browser and nothing is sent to any server.
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