Irrigation Runtime Calculator
Translate an entered watering depth and application efficiency into run time.
Your result
EVERYDAYEnter your values and select calculate.
On this page How it works & practical examples
How to use the Irrigation Runtime Calculator
Use total flow across all running emitters or sprinklers, not the flow of one unit unless only one operates. The desired depth is your agronomic input, while efficiency converts retained water into gross application.
The calculation
Worked example
50 m² with a 10 mm retained target requires 500 liters retained. At 80% application efficiency and 10 L/min flow, gross use is 625 liters and runtime 62.5 minutes.
Assumptions and limits
Assumes uniform application and constant flow. Runoff, infiltration limits, wind and irrigation zones are not separately modeled. The tool does not prescribe a watering depth or crop schedule.
Common questions
Does this choose how much a plant needs?
No. Enter a justified retained depth for your situation.
What if zones run separately?
Calculate each zone using its own area and active flow.