VPD Calculator
Compute vapor pressure deficit from air temperature and humidity
Guideline: Many crops prefer 0.8–1.2 kPa; seedling/veg lower, flowering slightly higher.
VPD (Air)
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VPD (Leaf)
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Saturation Vapor Pressure
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Saturation Vapor Pressure (Leaf)
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VPD = es(T) − ea, where es(T)=0.6108·exp(17.27·T/(T+237.3)), ea=es(air)·RH