Plan drip zones with confidence. Calculate total flow, convert GPH↔GPM, estimate run time, and avoid the most common layout mistakes—plus two free calculators.
Drip irrigation delivers water via small emitters or tubing directly to the root zone. Flow rate is how much water the system delivers in a given time (usually gallons per hour, GPH). With it, you can determine how many emitters a zone can support and how long to run the system.
Total Flow (GPH): Number of Emitters × Emitter Flow (GPH)
Convert to GPM: GPM = GPH ÷ 60
Drip Tape Option: If your tape is rated as “X GPM per 100 ft,” use (total length ÷ 100) × rated flow.
Pressure matters: Emitter/tape flow ratings assume a specific PSI; if your pressure differs, actual flow will vary.
Need your supply flow for drip sizing? Enter a bucket volume and fill time to get Gallons per Minute (GPM).
Formula: GPM = (gallons) ÷ (minutes). Liters convert with 1 gal = 3.78541 L.
You can, but zone balance and uniformity may suffer. Keep similar flows together or split into separate zones.
GPH is common in the U.S.; LPH is metric. The calculator supports both and converts LPH to GPH automatically.
Reduce emitter count per zone, shorten runs, increase pipe size, add a booster pump, or split zones.
Yes—most drip systems require regulated pressure to match emitter/tape specs and maintain even flow.
Pro tip: After calculating on paper, verify in the yard—measure pressure and do a quick bucket test at the farthest point of each zone.
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