CADR calculator

Measure your room, type it in and get the airflow to look for. Not sure what CADR means? Read the room size guide, or jump to bedroom purifiers and living room purifiers.

CADR calculator

Length (m)

Width (m)

Ceiling (m)

Air changes per hour

Room volume: 31.9 m³. For 5 air changes an hour, look for a CADR of about 160 m³/h (94 cfm). A planning rule of thumb, not a guarantee. Doors that open often, real-world performance and filter age all change the result, so leave some headroom.