HomeClimate & Environment CalculatorsVPD, ventilation and CO₂ tools to dial in temperature, humidity and airflow in your grow space.VPD Calculator (Vapor Pressure Deficit)Find the ideal temperature and humidity sweet spot for your plants.Grow Tent Ventilation CalculatorSize your exhaust fan so the air in your tent turns over fast enough.CO2 Enrichment CalculatorWork out how much CO2 to add to hit your target PPM.← All calculators