Estimate sprinkler head pressure after pipe friction, fittings, valves, elevation change, and sprinkler line losses. Enter starting pressure, sprinkler flow, pipe length, pipe diameter, fittings, and required sprinkler pressure to check if your setup has enough PSI.
Starting pressure:
Enter the available pressure before the sprinkler zone, such as pressure at the spigot, valve, pump, or supply line.
Zone flow:
Enter the total flow for the sprinkler zone. This can be one sprinkler or the combined GPM of several heads.
Losses:
The calculator subtracts pipe friction, fitting loss, valve/backflow loss, elevation rise, and any extra pressure loss.
A sprinkler pressure calculator is useful for lawn irrigation, garden sprinklers, hose-end sprinklers, underground sprinkler zones, rotor heads, spray heads, drip conversions, and pump planning.
This estimate helps check whether enough pressure remains at the sprinkler head after line losses.
This calculator estimates sprinkler head pressure using:
Sprinkler Head Pressure = Starting Pressure - Total Pressure Loss
Many spray heads work around 20 to 30 PSI, while many rotor heads commonly need around 30 to 45 PSI. Check the sprinkler head specifications when possible.
Common causes include low starting pressure, too many heads on one zone, small pipe, long pipe runs, clogged filters, backflow preventer loss, valves, elevation rise, or leaks.
Yes. Smaller pipe increases velocity and pressure loss, especially when a sprinkler zone has high total flow.
Yes. Water loses about 0.433 PSI for every foot of elevation rise and gains about 0.433 PSI for every foot downhill.