Vapor Pressure Deficit Calculator
Chemistry & BiologyCalculate vapor pressure deficit for a plant canopy from air temperature, leaf temperature, and relative humidity.
Vapor Pressure Deficit
Vapor pressure deficit in kilopascals, the difference between the moisture the air could hold and what it actually holds relative to the leaf surface.
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Odeh Ahwal0people find this calculator helpful
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Chemistry & Biology calculators
Frequently Asked Questions
What is vapor pressure deficit used for?
Vapor pressure deficit measures the drying power of the air around a plant, and growers use it to manage transpiration, irrigation, and disease risk in greenhouses and indoor grow spaces, keeping it within a target range for the crop being grown.
Why does the formula use both leaf temperature and air temperature?
Plants transpire based on the difference between the saturated vapor pressure at their own leaf surface temperature and the actual vapor pressure of the surrounding air, so both temperatures are needed, not just the air temperature alone.
What VPD range is considered healthy for most plants?
A VPD range of roughly 0.8 to 1.2 kilopascals is commonly cited as a healthy target for many greenhouse and indoor crops, though the ideal range varies by species and growth stage.
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