Irrigation Water Calculator – Calculate Water Needed for Crop Irrigation

Optimize water usage on your farm with our Irrigation Water Calculator. Enter crop type, field size, soil type, and evapotranspiration rate to calculate the precise water volume needed for efficient irrigation.

Field Area

Crop Type

Soil Type

Evapotranspiration Rate (mm/day)

Typical: 3-8 mm/day depending on climate

Irrigation Interval (Days)

Irrigation Method

Irrigation Water Requirements

Enter values and click Calculate to see results

Irrigation Calculation Formula

ETc (Crop ET) = ETo × Kc (Crop Coefficient)

Daily Water (m³) = ETc (mm) × Area (hectares)

Total Water = Daily Water × Irrigation Interval

Actual Water Needed = Total Water ÷ Irrigation Efficiency

Example: 10 hectare wheat field, ET = 5mm/day, 7-day interval, flood irrigation
ETc = 5 × 1.05 = 5.25 mm/day
Daily water = 5.25 × 10 = 52.5 m³/day
Total water = 52.5 × 7 / 0.6 = 612.5 m³ per irrigation

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