How does the Evapotranspiration Calculator work?

Reference ET (ET₀): well-watered grass, calculated from temperature, humidity, wind, radiation Then: Actual ET: ET₀ × crop coefficient (varies 0.2-1.2 by crop) Then: Typical: 100-200 mm/month depending on climate.

Can you give an example of how to use the Evapotranspiration Calculator?

Example: Input ET₀ = 5 mm/day, alfalfa (K_c = 1.0) gives a result of Daily ET = 5 mm, weekly = 35 mm (irrigation need) (During growing season).

Is the Evapotranspiration Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Evapotranspiration Calculator?

Our Evapotranspiration Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Evapotranspiration Calculator

Net Radiation (MJ/m²/day)

Mean Temperature (°C)

Wind Speed (m/s)

Evapotranspiration is water loss from soil/water bodies and plants. It's critical for irrigation design, water balance, and climate analysis.

Difficulty:intermediate

References

›Evapotranspiration — Wikipedia

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