Construction
Room Volume Calculator
Calculate the volume of a rectangular room from length, width and height.
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Formula
Room volume = length multiplied by width multiplied by height.
How it works
Multiply the three room dimensions to get cubic volume. Volume matters for heating, cooling, ventilation and acoustics, since a tall room needs more air handling than a low room of the same floor area.
FAQs
What if the room is L-shaped?
Split it into rectangles, calculate each volume, and add them together.
Do I use internal dimensions?
Yes, measure inside wall to inside wall for usable room volume.
Why does volume matter?
Heating, cooling and fresh-air systems are sized on volume, not floor area alone.
Rough estimate only — consult a licensed professional for structural work before building.