Household & Daily Life
Room Volume Calculator
Calculate the volume of a room for AC units, air purifiers and more from length, width and height.
Sizing AC units, air purifiers or radiators often requires the room volume. Enter length, width and height to calculate it.
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Room volume
Pro tips
- AC unit BTU rating is usually estimated based on room volume.
- Sloped ceilings reduce usable volume – calculate separately if needed.
All calculations are non-binding estimates provided without guarantee. For safety-relevant decisions (e.g. pool chemistry), please consult a professional.
Frequently Asked Questions
How do I calculate room volume?
Length × width × height gives you the volume in cubic meters – for sloped ceilings or irregular rooms, it helps to roughly split the room into sections.
What do I need room volume for?
For example, to size air conditioners, air purifiers or dehumidifiers, whose capacity is usually specified in m³ per hour.
How do I calculate volume with a sloped ceiling?
The easiest way is to split the room into a rectangular part and a triangular part, then add both volumes together.
How many m³ does a typical living room have?
At 20 m² floor area and 2.5 m ceiling height, that's 50 m³ – a typical value for many living rooms in Germany.