Indoor CO₂ Calculator

Model indoor CO₂ buildup from occupancy and ventilation. Find steady-state levels and time to reach 1,000 ppm.

Room Volume (ft³)

Number of Occupants

Ventilation Rate (CFM)

Activity Level

Tab to move between fields

Steady-State CO₂ (ppm)

985

Time to 1,000 ppm (min)0

Required Vent. for 1,000 ppm (CFM)48.7

Per-Person Ventilation (CFM)12.5

Total CO₂ Generation (mL/hr)48,000

How to Use This Calculator

Enter Room Volume (ft³), Number of Occupants, and Ventilation Rate (CFM).
Set Activity Level.
Review the Steady-State CO₂ (ppm) result.
Use Time to 1,000 ppm (min) and Required Vent. for 1,000 ppm (CFM) to inform your decision.

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