Dr Greenhouse VPD Calculator

Welcome to the Dr.
Greenhouse VPD App!

With this tool, you can easily calculate the Vapor Pressure Deficit of your grow rooms air.

First, choose your temperature units: Fahrenheit or Celsius.
Then plug in the air temperature and relative humidity and click Calculate.
The resulting VPD (kPa) will be color-coded to indicate whether the grow room climate is humid (blue), vegetative (green), reproductive (yellow), or dry (purple).

The desired VPD depends on the type of plant, its stage of growth, and, in some cases, the time of day.
In general, leafy greens, microgreens, and other non-flowering plants enjoy a vegetative environment.
Flowering and fruiting plants benefit from a reproductive environment.
Cannabis plants may yield more trichomes and terpenes, if exposed to a dry and water-stressed environment in the days leading up to harvest.
And a humid nighttime environment can improve translocation of nutrients and metabolites to strawberries and other fruiting plants.,

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