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Room Volume Calculator
Compute room volume in m³ for HVAC, ventilation and heating sizing.
Volume = length × width × height. It is used to size air conditioners (BTU), ventilation rates and heating power.
How it works
Volume = length × width × height. It is used to size air conditioners (BTU), ventilation rates and heating power.
Worked example
A 5 m × 4 m room with 2.5 m ceilings has a volume of 50 m³.
Recommendations
- Use volume, not area, when sizing an air conditioner
- For HVAC, allow ~30–40 W per m³
- Include the exact ceiling height, often 2.5–2.7 m
Tips & advice
- Measure height at several points, floors can be uneven
- For lofts, use the average usable height
- Volume matters for CO₂ / ventilation calculations too
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Room Volume Calculator
Compute room volume in m³ for HVAC, ventilation and heating sizing.
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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