// multi-utility computation suite · offline · instant · precise
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agri.crop-water-requirement Calculator
Calculates how much water crops actually need each day using the FAO method — reference evapotranspiration (ETo) multiplied by a crop-specific coefficient (Kc), adjusted for field area and irrigation system losses. Essential for scheduling irrigations and avoiding both water stress and wasteful over-irrigation.
Inputs
Eto 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.
Efficiency Pct
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Results
crop ET (mm/day)
Reference formula or conversion factor shown for context.
net water need (m³/day)
The value at the specified point or condition.
gross water (incl. losses, m³/day)
The decrease or degradation from the baseline.
in acre-inches/week
Sample size or count used in the calculation.
Kc
Reference formula or conversion factor shown for context.
ETc = ETo × Kc
Reference formula or conversion factor shown for context.