Air purifier calculator

Calculate the right clean-air size for your room

Use the first calculator to find the CADR a room needs. Use the second one to check how large a room a purifier can support.

Home and office use follow the same airflow math, but with different target settings. Office mode uses a stronger clean-air target for shared indoor spaces.

Calculator 1

How much CADR do I need for this room?

Use this if you know the room size and want a clean-air target for home or office use.

Use case

Home clean air Office shared air

Units

US - ft, sq ft, CFM Metric - m, m², m³/h

Target clean air

Home default: 4.8 ACH

Enter room area directly Enter room length and width

Room area (sq ft)

Ceiling height (ft)

Result

Enter a room size to calculate the required clean air delivery rate.

Calculator 2

How large a room can this purifier support?

Use this if you already know a purifier's CADR and want to estimate the room size it can support at a chosen clean-air target.

Use case

Home clean air Office shared air

CADR input units

CFM m³/h

Target clean air

Home default: 4.8 ACH

CADR (CFM)

Ceiling height (ft)

Result

Enter a CADR value to estimate room coverage.