VPD Calculator (Vapor Pressure Deficit)

Tetens saturation-pressure approximation over liquid water. Negative leaf-to-air deficit indicates conditions allowing condensation on the leaf.

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Result

Enter your values and run the tool to see your result.

Check the units, enter your values, and run the tool. Results follow the assumptions and method below.

Air vapor-pressure deficit0.6108*exp(17.27*air/(air+237.3))*(1-rh/100)

Leaf-to-air vapor-pressure deficit0.6108*exp(17.27*leaf/(leaf+237.3))-rh/100*0.6108*exp(17.27*air/(air+237.3))