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Water Vapor Calculators

Here are some useful water vapor calculators.

Temperature to saturated water vapor pressure
(SWVP) in kPa and Torr

In this case, the term “temperature” is equivalent to dew point (dewpoint).
This calculator uses the Arden Buck equation, accurate from -40 to +50 oC.
Citation: Buck, A. 1981. J Appl Meteorol 20, 1527-1532

Ambient temperature and relative humidity to
water vapor pressure (WVP) in kPa and Torr

Here, the term “temperature” refers to ambient temperature, not dew point!
This calculator uses the Arden Buck equation, as above.

Water vapor pressure in kPa to dewpoint

This calculator is usable for water vapor pressures from 0.01 to 12 kPa.
Accuracy is 0.1-0.2oC increasing to ca. 0.5oC at the range boundaries.