Evapotranspiration Calculator

Calculate Reference evapotranspiration (ETo) according to FAO standards



Latitude (Decimals)

Elevation (m)

Date

Temperature (Min)

Temperature (Max)



Temperature (Dewpoint)

Temperature (Dry)

Temperature (Wet)

RHmin

RHmax

RHmean

Wind Speed (m/s)

Wind Speed height (m)

Sunlight Hours

Radiation



ETo (mm/day)

ET Value




Tmean Dewpoint J
P γ Δ
δ (rad) dr φ
ωs Ra N
e°(Tmin) e°(Tmax) e°(Tmax)
es e°(Tdew) ea
es-ea Rso Rs
Rns Rnl Rn
u2
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