Calculator · water
Irrigation volume calculator
Net irrigation volume from a target depth and area, and gross volume from an application efficiency.
Result
Enter values to see a result.
Formula & assumptions
Net irrigation volume
formula v1.0.0 · calc v1 · reviewed 2026-07-12net_volume_m³ = depth_mm × area_ha × 10
Applies to: Applying a target net depth of water to a field area.
Assumptions
- 1 mm of water depth over 1 ha equals 10 m³.
Limitations
- Net depth is the water required at the crop, before application losses.
Gross irrigation volume from efficiency
formula v1.0.0 · calc v1 · reviewed 2026-07-12gross_volume = net_volume ÷ (application_efficiency% ÷ 100)
Applies to: Estimating water to supply given a system efficiency.
Assumptions
- Application efficiency accounts for conveyance and application losses.
Limitations
- Efficiency is system- and management-specific; a planning estimate only.
About this tool
- Does not recommend a depth by crop. Net depth is the requirement at the crop; gross adds losses. A planning estimate, not a scheduling prescription.
Educational reference — not a prescription
- These calculators are for education and reference. The quality of any result depends entirely on the accuracy of the values you enter.
- Local agronomic conditions, legal requirements, product labels, and professional advice may override a general calculation.
- Results are not pesticide, fertilizer, irrigation, or veterinary prescriptions, and are not a substitute for advice from a qualified agronomist or your local extension service.