Hydraulic Pump Calculations - Pneumatic and Hydraulic Company

Horsepower Required to Drive a Pump

Gallons Per Minute GPM

Formula: GPM x PSI x .0007 = horsepower needed

Pounds Sq Inch PSI

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

Horsepower (HP)

Pump Output Flow (In Gallons Per Minute)

Pump RPM

Formula: RPM x Displacement ÷ 231 = gpm

Pump Displacement

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

Output Flow (GPM)

Pump Displacement Needed for GPM of Output Flow

Gallons per Minute (GPM)

Formula: 231 x GPM ÷ RPM = in3 per revolution

Revolutions per Minute (RPM)

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

Pump Displacement (Cubic Inches)

*Pneumatic and Hydraulic Company, LLC assumes no liability for errors in data nor in safe and/or satisfactory operation of equipment designed from this information.