Size watering like a pro. Enter flow rate, emitter/nozzle output, target depth, and efficiency to get minutes per zone for drip or spray. Convert between GPM/LPH and in/mm automatically.
💧 Irrigation Run-Time Calculator
Minutes per zone for drip & sprinkler systems with unit conversions and efficiency factor.
Results
Tip: Run deep & infrequent for turf; frequent & short for seedlings/containers.
How to Use the Irrigation Run-Time Calculator
- Choose Drip or Sprinkler.
- Enter target water depth (in/mm) for this cycle.
- Drip: set emitters per zone and emitter rate (GPH/L/h).
- Sprinkler: set precipitation rate (in/hr or mm/hr) and area (optional).
- Set system efficiency (e.g., 80%). Click Calculate → get minutes per zone.
Irrigation FAQ
What efficiency should I use?
Typical: Drip 85–95%, Sprinklers 60–80% depending on wind/overlap. Start at 80% if unsure.
What is precipitation rate?
How fast your system applies water (in/hr or mm/hr). Manufacturers publish nozzle charts; you can also catch-can test.
How deep should I water?
Turf: 0.5–1.0 in per cycle; vegetables: 0.5–1.0 in; trees: fewer, deeper soaks. Adjust by soil/drainage.
Why are my results different from the controller?
Controller programs are time-based; this tool aligns run-time to actual water applied so you can tune programs.
How often should I water?
Use local weather/ET and plant needs. Deep & infrequent for established turf; frequent & light for seedlings.