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VPD calculator
Vapour pressure deficit from temperature and humidity
Readings
°C
Required
%
Required
°C
Leaves are usually 1–3 °C cooler due to transpiration (default −2).
Stage (for the target range)
Vapour pressure deficit
–kPa
Guide values: cutting/seedling 0.4 – 0.8, vegetative 0.8 – 1.2, flowering 1.2 – 1.6 kPa.
Calculate with your own data
In the Graswiese growlog the calculators fill themselves from your grow diary: latest readings, lamps, mixes from your inventory – free and usable offline.