Calculate ACH from room volume and ventilation flow, or the airflow needed for a target ACH.
Results are for information and preliminary estimation. For critical technical work, manufacturer data, local codes and qualified professional review take precedence.
ACH = hourly airflow (m³/h) / room volume (m³). Target values depend on occupancy and applicable ventilation guidance.
Example: 300 m³/h in a 75 m³ room provides about 4 ACH.
HVAC capacity depends on more than floor area. Volume, solar gain, insulation, glazing, occupants and equipment loads all matter; critical selections require a proper heat-load assessment.
No. Use, comfort, energy, humidity and noise all matter.
Use the requirements or guidance applicable to the room type and location.
What AC capacity does my room need?
→How much electricity and money does an AC use per day or month?
→How many kW or tons of cooling is a BTU/h rating?
→How much airflow does a room need in m³/h?
→Tell us if a calculation is unclear, incomplete or appears incorrect.