LEAF VPD CALCULATOR

Calculates Leaf VPD using Air Temp + RH + Leaf Temp.
DAY NIGHT
ENVIRONMENTAL PARAMETERS
75.0°F
The temperature of the air circulating in the grow space around the plants
75.0°F
Use an IR thermometer to measure leaf-surface temperature (Nerds: it's a proxy for the temperature of the air inside the leaf)
Leaf–Air ΔT: 0.0°F
60%
You can use a hygrometer to find this value (Nerds: how full the surrounding air is with water relative to how much it could hold at its current temperature).

RESULT

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TARGET: —
VPD BAND (kPa)
—
Low / Good / High targets depend on Phase + Day/Night.