Hydraulic Flow Calculator

Convert between GPM, LPM, CFM and calculate flow velocity based on pipe diameter

Flow Parameters

Calculation Mode

Flow Rate (GPM)

Flow Rate (LPM)

Flow Rate (CFM)

Enter flow rate to convert units or calculate velocity

Conversion Factors:

• 1 GPM = 3.785 LPM

• 1 GPM = 0.1337 CFM

• 1 LPM = 0.2642 GPM

Velocity Formula: V = Q / A

Recommended Velocities:

• Suction lines: 2-4 ft/sec

• Pressure lines: 10-15 ft/sec

• Return lines: 6-10 ft/sec

Reynolds Number: Re = ρVD/μ