Sprinkler Zone Capacity Calculator
Enter measured supply flow, a reserve, the number of heads, and nozzle demand. Do not mix spray heads and rotors on one zone just because the GPM total fits.
Capacity check passes0.6 GPM remaining
- Safe zone flow
- 9.6 GPM
- Nozzle demand
- 9.0 GPM
This is a planning screen, not a pressure-loss calculation. Use manufacturer nozzle charts and measured pressure before changing a zone.
How to use the result
Available GPM is not the same as operating pressure. A positive flow margin cannot rule out pressure loss from long pipe runs, elevation, restrictions, or a partially open valve. Use the exact manufacturer nozzle chart at the pressure measured in the zone.