VPD Calculator
Calculate vapour pressure deficit and dial in temperature & humidity for every growth stage
Air & Units
Leaf Temperature
Leaves transpire and sit cooler than the air, typically 1 to 3 °C below.
Measured canopy/leaf surface temperature (e.g. IR thermometer).
Target Range
Some crops shift their VPD target by stage; others sit in one band their whole life.
Targets use leaf (canopy) VPD, the metric that matters to the plant.
Leaf VPD is the key number. Aim for the green band for your stage.