Grow Room CO2 Calculator: Find Your Exact Flow Rate
Use the calculator below to find the precise CO2 flow rate for your grow room or tent — then use the guide to dial in delivery method, controllers, and target PPM for your stage of growth.
Carbon dioxide is one of the most powerful yield levers available to indoor growers, but only when applied with precision. The CO2 calculator on this page takes your room dimensions, ambient CO2 level, and target PPM and outputs the exact flow rate you need — whether you’re running a compressed tank, a propane or natural gas generator, or a passive enrichment method.
When paired with adequate lighting and a sealed environment, CO2 enrichment can improve growth rates by 20–30% under optimal conditions (strong lighting at >600 µmol/m²/s, temps 80–90°F, sealed room).
Not sure CO2 is the right next step? Dial in your VPD, humidity, and airflow first — then come back to CO2.