Estimate the rate of water evaporation from a surface based on temperature, humidity, and wind.
Environmental Conditions
Evaporation Results
Enter environmental conditions
About this calculator
Quick Reference
PwsSaturation Pressure at Water Surface
PwaActual Vapor Pressure of Air
vWind Speed
A, BEmpirical coefficients
Overview
Evaporation is the process by which water changes from a liquid to a gas or vapor. This rate is influenced by the energy available (temperature), the air's ability to hold more moisture (humidity), and the removal of vapor from the surface (wind).
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Pro Tips
Warmer water and lower humidity significantly increase evaporation.
Wind speed is measured just above the water surface.
Saturation vapor pressure increases exponentially with temperature.
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Fun Facts
"The oceans provide about 85% of global evaporation."
"An average swimming pool can lose about 5mm of water per day just from evaporation."
"Plants also 'evaporate' water through their leaves, a process called transpiration."
