Drip Irrigation Runtime Calculator — Watering Duration
Enter the number of emitters, each emitter flow rate in gallons per hour (GPH), and the total gallons you want to deliver. The calculator gives the watering runtime in minutes and hours.
What this calculator determines
It calculates the watering runtime in minutes and hours needed to deliver a target number of gallons through a drip zone.
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Examples
20 emitters at 1 GPH, deliver 10 gal
20 emitters, 1 GPH, 10 gal target
Calculation
- Total flow: 20 × 1 = 20 GPH
- Runtime: 10 ÷ 20 = 0.5 hr = 30 min
30 minutes
Assumptions & Conventions
- Runtime formula
- Total flow = emitters × GPH; runtime (hours) = target gallons ÷ total flow; minutes = hours × 60.
- Emitter flow rate
- Use the rated GPH printed on your emitters (commonly 0.5, 1, or 2 GPH).
- Exact calculation
- A direct flow-rate calculation; actual delivery varies with pressure and system design.