// multi-utility computation suite · offline · instant · precise
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sci.crop-water-requirement-Kc Calculator
Calculates crop water requirement ET_c = Kc × ET₀ for each growth stage using FAO-56 Kc values adjusted for local climate. Total seasonal water requirement for wheat ≈ 450–650 mm — deficit irrigation using 70–80% of ET_c can maintain 90–95% of yield in many crops.
Inputs
Et0 Mm Day
Reference formula or conversion factor shown for context.
Kc
Reference formula or conversion factor shown for context.
Area Ha
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Irrigation Efficiency Pct
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
crop ET ETc (mm/day)
Reference formula or conversion factor shown for context.
net water volume (m³/day)
The computed three-dimensional volume.
gross water required (m³/day)
The value at the specified point or condition.
annual gross water (m³/year)
The result expressed on a per-year basis.
ETc = Kc × ET₀
Reference formula or conversion factor shown for context.