ASHRAE 62.1 Ventilation Rate Calculator

Calculate minimum outdoor air ventilation requirements per ASHRAE Standard 62.1 using the Ventilation Rate Procedure.

Conditioned floor area.
ft²
Number of occupants.
people
CFM per sq ft (Office=0.06, Retail=0.12, Classroom=0.12).
CFM/ft²
CFM per person (Office=5, Retail=7.5, Classroom=10).
CFM/person
System effectiveness (typically 0.8-1.0).

Results

Area Component-CFM
People Component-CFM
Breathing Zone OA-CFM
Design Outdoor Air-CFM
References: ASHRAE Standard 62.1-2022: Ventilation for Acceptable Indoor Air Quality; ASHRAE 62.1 User's Manual