Evapotranspiration Calculator
Estimate reference evapotranspiration (ET₀) using a simplified Penman-Monteith approach from temperature, humidity, wind speed, and solar radiation.
Inputs
Results
Daily ET₀
5.16 mm/day
Weekly ET₀
36.1 mm/week
How to Use This Calculator
- Enter Mean Temperature, Relative Humidity, and Wind Speed.
- Set Solar Radiation.
- Review Daily ET₀ (mm/day) and Weekly ET₀ (mm/week).
- Use Monthly ET₀ (mm/month) and Annual ET₀ (est.) (mm/yr) to inform your decision.
- Use the chart to visualize the results and explore different scenarios by adjusting inputs.
Formula
ET₀ = [0.408ΔRn + γ(900/(T+273))u₂(es-ea)] / [Δ + γ(1+0.34u₂)]Related Calculators
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