Vapor Pressure VPD Calculator is a user-friendly app for all indoor and greenhouse plant growers. With its cutting-edge algorithm, you can easily dial in your grow environment and achieve the ideal Vapor Pressure Deficit (VPD) range for your plants. Whether you're growing hydro, pulse, or cloning your favorite flora, this app is your grow diary buddy. It's the perfect tool for monitoring and optimizing your indoor or greenhouse grow environment, all for free. Make sure your plants receive the right amount of humidity and temperature with Vapor Pressure VPD Calculator.


Vapor pressure deficit, or VPD, is the difference (deficit) between the amount of moisture in the air and how much moisture the air can hold when it is saturated. Once air becomes saturated, water will condense out to form clouds, dew or films of water over leaves. It is this last instance that makes VPD important for greenhouse regulation. If a film of water forms on a plant leaf, it becomes far more susceptible to rot. On the other hand, as the VPD increases, the plant needs to draw more water from its roots. In the case of cuttings, the plant may dry out and die.