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Hydraulic Motor Calculators

Imperial

GPM of Flow Needed for Fluid Motor Speed
  • Motor Displacement (in3 per rev)
  • Motor RPM

  • GPM Flow Required

Example: How many GPM are needed to drive a 3.75 cubic inch motor at 1500 rpm?

Formula: Motor Displacement x Motor RPM ÷ 231 = gpm

 

Fluid Motor Speed from GPM Input
  • Gallons per Minute (GPM)
  • Fluid Motor Displacement (in3)

  • RPM

Example: How fast will a 0.75 cubic inch motor turn with 6 gpm input?

Formula: 231 x GPM ÷ Fluid Motor Displacement = RPM

 

Fluid Motor Torque from Pressure and Displacement
  • Pressure (PSI)
  • Motor Displacement (in3)

  • Torque

Example: How much torque does a 2.5 cubic inch motor develop at 2,000 psi?

Formula: PSI x Motor Displacement ÷ (2 x π) = torque in inch pounds

Metric

LPM of Flow Needed for Fluid Motor Speed
  • Motor Displacement (cm3 per rev)
  • Motor RPM

  • LPM Flow Required

Example: How many LPM are needed to drive a 40 cc motor at 1500 rpm?

Formula: Motor Displacement x Motor RPM ÷ 1000 = LPM

 

Fluid Motor Speed from LPM Input
  • Liters per Minute (LPM)
  • Fluid Motor Displacement (cm3)

  • RPM

Example: How fast will a 25 cc motor turn with 30 LPM input?

Formula: 1000 x LPM ÷ Fluid Motor Displacement = RPM

 

Fluid Motor Torque from Pressure and Displacement
  • Pressure (MPa)
  • Motor Displacement (cm3)

  • Torque

Example: How much torque does a 25 cc motor develop at 15 MPa?

Formula: MPa x Motor Displacement ÷ (2 x π) = torque in Nm

 

Fluid Motor Torque from Horsepower and RPM
  • Horsepower
  • Motor RPM

  • Torque

Example: How much torque is developed by a motor at 12 horsepower and 1750 rpm?

Formula: Horsepower x 63025 ÷ RPM = torque in inch pounds

 

Fluid Motor Torque from GPM, PSI and RPM
  • Gallons per Minute (GPM)
  • Motor PSI
  • Motor RPM

  • Torque

Example: How much torque does a motor develop at 1,200 psi, 1500 rpm, with 10 gpm input?

Formula: GPM x PSI x 36.77 ÷ RPM = torque in inch pounds

 

This company assumes no liability for errors in data nor in safe and/or satisfactory operation of equipment designed from this information.

 

Fluid Motor Torque from Kilowatt and RPM
  • Kilowatt
  • Motor RPM

  • Torque

Example: How much torque is developed by a motor at 100 Kilowatt and 1500 rpm?

Formula: Kilowatt x 9550 ÷ RPM = torque in Nm

 

Fluid Motor Torque from LPM, MPa and RPM
  • Liters per Minute (LPM)
  • Motor MPa
  • Motor RPM

  • Torque

Example: How much torque does a motor develop at 10 MPa, 1500 rpm, with 40 LPM input?

Formula: LPM x MPa x 159 ÷ RPM = torque in Nm

 

This company assumes no liability for errors in data nor in safe and/or satisfactory operation of equipment designed from this information.