Enter your Room Length, Width, and Height alongside your Ambient CO2 Level, Target CO2 Level, and CO2 On Time, and the CO2 Grow Room Calculator works out the exact CO2 Flow Rate Required to hit your target — plus your Room Volume, CO2 Increase Needed, and Hourly CO2 Volume.
CO2 Flow Rate Required
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Room Volume
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CO2 Increase Needed
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Hourly CO2 Volume
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For most plants, the optimal CO2 level ranges from 1000-1500 ppm during the vegetative and flowering stages. Cannabis and other high-light plants benefit most from levels around 1200-1400 ppm when using supplemental lighting.
Tank duration depends on your room size, target CO2 levels, and usage schedule. A 20lb CO2 tank typically lasts 2-4 weeks in a small grow room, while larger rooms or higher target levels will consume CO2 faster.
Yes, CO2 levels above 1500 ppm can actually reduce plant growth and photosynthesis efficiency. Additionally, levels above 5000 ppm can be dangerous to humans, so proper ventilation and monitoring are essential.
No, plants only use CO2 during photosynthesis when lights are on. Running CO2 during dark periods is wasteful and unnecessary. Set your CO2 system to operate only during the light cycle.
Use circulation fans to distribute CO2 evenly throughout the room. Place CO2 outlets above plants since CO2 is heavier than air and will settle downward. Avoid placing outlets near exhaust fans.
Many commercial growing facilities are required to monitor CO2 levels for worker safety compliance. Check your local regulations, as high CO2 concentrations can pose health risks in enclosed spaces.
Signs of CO2 leaks include faster than expected tank depletion, hissing sounds from connections, or CO2 readings that don't match your settings. Use soapy water on connections to check for bubbles indicating leaks.