GPM to PSI Conversion Calculator

GPM to PSI Calculator

Enter flow rate in gallons per minute (GPM) and input pipe diameter in inches in gpm to psi converter. Select your pipe material for friction loss coefficient. The calculator will compute the pressure loss (PSI) based on flow and pipe characteristics.

  • Inputs: Flow rate = 10 GPM, Pipe size = 0.75 inches, Material = Copper
  • Process: Enter values and select material type
  • Result: Pressure loss is 3.2 PSI

GPM to PSI Conversion Chart

Gallons Per Minute (GPM)Pounds Per Square Inch (PSI)
1 GPM2.31 PSI
2 GPM4.62 PSI
2.5 GPM5.78 PSI
4 GPM9.24 PSI
5 GPM11.55 PSI
6 GPM13.86 PSI
10 GPM23.1 PSI
30 GPM69.3 PSI
40 GPM92.4 PSI
50 GPM115.5 PSI
75 GPM173.25 PSI
100 GPM231 PSI
400 GPM924 PSI
500 GPM1,155 PSI
1000 GPM2,310 PSI

How to Calculate GPM to PSI

To convert GPM to PSI, multiply flow rate squared by 100 times the friction factor. Divide this by pipe diameter to the fifth power. Consider pipe length, material, and fittings for accurate pressure loss calculations.

  • Inputs: Flow rate = 15 GPM, Pipe size = 1 inch, Length = 100 feet
  • Calculations: (0.2083 × (100/100) × (15/100)^1.85) ÷ (1)^4.8655
  • Result: Pressure loss is 2.8 PSI

GPM to PSI Conversion Formula

PSI = (0.2083 × (100/100) × (GPM/100)^1.85) ÷ (d)^4.8655

Where:

GPM = Flow rate in gallons per minute
d = Pipe inside diameter in inches
PSI = Pressure loss per 100 feet of pipe

Home Water Supply

  • Inputs: Flow = 12 GPM, Diameter = 0.75 inch, Length = 50 feet
  • Calculations: (0.2083 × (50/100) × (12/100)^1.85) ÷ (0.75)^4.8655
  • Result: 2.1 PSI pressure loss

Garden Irrigation

  • Inputs: Flow = 8 GPM, Diameter = 0.5 inch, Length = 75 feet
  • Calculations: (0.2083 × (75/100) × (8/100)^1.85) ÷ (0.5)^4.8655
  • Result: 4.5 PSI pressure loss

Commercial System

  • Inputs: Flow = 25 GPM, Diameter = 1.5 inches, Length = 200 feet
  • Calculations: (0.2083 × (200/100) × (25/100)^1.85) ÷ (1.5)^4.8655
  • Result: 3.9 PSI pressure loss

Sprinkler Line

  • Inputs: Flow = 6 GPM, Diameter = 0.625 inch, Length = 150 feet
  • Calculations: (0.2083 × (150/100) × (6/100)^1.85) ÷ (0.625)^4.8655
  • Result: 2.7 PSI pressure loss

Industrial Pipe

  • Inputs: Flow = 40 GPM, Diameter = 2 inches, Length = 300 feet
  • Calculations: (0.2083 × (300/100) × (40/100)^1.85) ÷ (2)^4.8655
  • Result: 5.3 PSI pressure loss

What is GPM and PSI?

GPM (Gallons Per Minute): A measurement of fluid flow rate indicating the volume of fluid moving through a system per minute.

1 GPM = 3.785 liters/minute = 0.063 liters/second

PSI (Pounds per Square Inch): A unit measuring fluid pressure as force per unit area, commonly used in plumbing and hydraulic systems.

1 PSI = 6.895 kPa = 0.068 atm

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