Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Hydraulic Oil Pump - Horsepower vs. Pressure and Volume Flow

Sponsored Links

Horsepower required by a hydraulic pump can be calculated as

P HP = q p / 1714                                                     (1)


P HP = horsepower (HP)

q = flow (gpm)

p = required pressure (psi)

  • 1 gpm (US) =6.30888x10 -5 m3 /s = 0.227 m3 /h = 0.06309 dm3 (litre)/s = 2.228x10-3 ft3 /s = 0.1337 ft3 /min = 0.8327 gpm (UK)
  • 1 psi (lb/in2) = 144 psf (lbf /ft2) = 6,894.8 Pa (N/m2) = 6.895x10-3 N/mm2= 6.895x10-2 bar
  • 1 hp = 745.7 W

Example - Hydraulic Pump

The horsepower required by a a pump with flow 20 gpm and 1500 psi increase in pressure can be calculated as

P HP = (20 gpm) (1500 psi) / 1714

= 17.5 HP


Note that the equation above is for a pump with 100% efficiency - which in the practial life is never true. An overall efficiency of 80 - 95% is common.

The equation above (1) can be modified to

P HP = q p / ((μ / 100) 1714)                                        (2)


μ = overall efficiency (%)

Sponsored Links

Related Topics

Hydraulics and Pneumatics

Hydraulic and pneumatic systems - fluids, forces, pumps and pistons.

Related Documents

Grease - Temperature Limits

Temperature limits for grease - a combination of oil and thickener.

Hydraulic Cylinder Area vs. Diameter

Typical hydraulic cylinders and acting area vs. cylinder diameter.

Hydraulic Cylinders - Volume Displacement

The volumetric displacement of hydraulic cylinders.

Hydraulic Force vs. Pressure and Cylinder Size

Calculate hydraulic cylinder force.

Hydraulic Pump Motor Sizing

Motor size vs. flow rate, shaft torque, shaft power and hydraulic power.

Hydraulic Pump Volume Capacity

Calculate hydraulic pump volume capacity.

ISO Grade Oils - Viscosities and Densities

Viscosities and densities of ISO - and equivalent SAE grade oils.

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!


We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.