Drip Irrigation Flow Calculator — Total System GPH & GPM
Enter the number of emitters in your irrigation zone and the flow rate per emitter (GPH). The calculator returns the total system flow in gallons per hour (GPH) and gallons per minute (GPM).
What this calculator determines
It calculates the total flow rate of a drip irrigation zone in gallons per hour and gallons per minute from the emitter count and per-emitter GPH.
Related calculators
Drip Irrigation Runtime Calculator
Watering runtime from emitters, emitter flow rate, and target gallons
Garden Watering Calculator
Gallons of water to deliver a given depth over a garden area
Rain Barrel Collection Calculator
Estimate rainwater captured from a catchment area and rainfall
Rainfall to Gallons Calculator
Gallons of rain that fall on an area from a rainfall amount
Garden Hose Water Usage Calculator
Gallons delivered from hose flow rate (GPM) and watering time
Examples
30 emitters at 1 GPH
30 emitters, 1 GPH each
Calculation
- Total GPH: 30 × 1 = 30
- GPM: 30 ÷ 60 = 0.5
30 GPH (0.5 GPM)
Assumptions & Conventions
- Flow formula
- Total GPH = emitters × GPH per emitter; GPM = GPH ÷ 60.
- Rated flow
- Use the rated GPH of your emitters; actual flow varies with water pressure and system design.