Horsepower Required to Drive a Pump
  • Gallons per minute (GPM)
  • Pounds/Sq Inch (PSI)

  • Horsepower

Example: How many horsepower are needed to drive a 5 gpm pump at 1500 psi?

Formula: GPM x PSI x .0007 = horsepower needed


Pump Output Flow (in Gallons per Minute)
  • Pump RPM
  • Pump Displacement (in3)

  • Output Flow

Example: How much oil will be produced by a 2.5 cubic inch pump operating at 1200 rpm?

Formula: RPM x Displacement ÷ 231 = gpm


Pump Displacement Needed for GPM of Output Flow
  • Gallons per Minute (GPM)
  • Revolutions per Minute (RPM)

  • Pump Displacement

Example: What displacement is needed to produce 5 GPM at 1500 RPM?

Formula: 231 x GPM ÷ RPM = in3 per revolution


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