VPD Calculator (Vapor Pressure Deficit)

Guideline: Many crops prefer 0.8–1.2 kPa; seedling/veg lower, flowering slightly higher.

VPD (Air)

VPD (Leaf)

Saturation Vapor Pressure

Saturation Vapor Pressure (Leaf)

VPD = es(T) − ea, where es(T)=0.6108·exp(17.27·T/(T+237.3)), ea=es(air)·RH

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