GPM to PSI Calculator – Convert Gallons Per Minute to PSI

This advanced gpm to psi converter helps process engineers and technical professionals understand the relationship between volumetric flow rate and pressure measurements.

GPM to PSI Chart

GPM to PSI Conversion Formula

The connection between GPM and PSI is governed by the Darcy-Weisbach equation, a fundamental principle in fluid mechanics:

ΔP = (f × L × ρ × V²) / (2 × g × D)

Where:

• ΔP represents the Pressure Drop (PSI)
• f is the Friction Factor
• L denotes the Pipe Length (ft)
• ρ indicates Fluid Density (lb/ft³)
• V represents Fluid Velocity (ft/s)
• g is the Gravitational Constant
• D is the Pipe Diameter (ft)

How to Convert Gallons Per Minute to PSI?

• Calculate fluid velocity using the flow rate and pipe dimensions
• Determine the Reynolds number to characterize flow behavior
• Find the friction factor using the Moody diagram or equations
• Apply the pressure loss formula to compute the final PSI value

A sprinkler system needs to deliver 20 GPM through a 2-inch PVC pipe spanning 150 feet. Here’s the calculation:

• Velocity = (20 × 0.321) / (3.14 × 1²) = 2.04 ft/s
• Reynolds number = 81,800 (turbulent flow)
• Friction factor = 0.022
• Pressure loss = 3.2 PSI

Reference Sources:

• National Institute of Standards and Technology (NIST) https://www.nist.gov/

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