Indoor Air Quality Score Calculator

Calculate a composite IAQ score (0-100) based on ASHRAE 62.1 ventilation, MERV filtration, CO2, VOC levels, and humidity.

Floor Area (sq ft)

Number of Occupants

Outdoor Air Supply (CFM)

Filter MERV Rating

CO₂ Level (ppm)

Total VOCs (µg/m³)

Relative Humidity (%)

Tab to move between fields

IAQ Score (0-100)

85.4

Ventilation Adequacy (%)182%

CFM per Person20

Required CFM (ASHRAE)220

CO₂ Score (of 20)15

VOC Score (of 15)12.5

RatingExcellent

Well CompliantYes

How to Use This Calculator

Enter Floor Area in sq ft and Number of Occupants for the space.
Enter Outdoor Air Supply in CFM and Filter MERV Rating (MERV 13 is the LEED/WELL standard).
Enter measured CO₂ Level in ppm, Total VOCs in µg/m³, and Relative Humidity percentage.
Review the IAQ Score (0–100) and Ventilation Adequacy percentage vs ASHRAE 62.1 minimum.
Check CFM Per Person and Required CFM to determine if additional outdoor air supply is needed.

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