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

Hydraulic Pump Motor Sizing

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

Sponsored Links

Equations for hydraulic pumps:

Flow rate

Q = D n / 1000                                     (1)


Q = flow rate (l/min)

D = displacement of piston (cm3/rev) 

n = revolutions (rpm)

  • rev = revolution
  • rpm = revolution per minute

Shaft Torque

T = D p / 20 π                               (2)


T = torque (Nm)

p = pressure (bar)

Shaft Power 

Ps = T n / 9554                            (3)


Ps = shaft power (kW)

Hydraulic Power

Ph = Q p / 600                           (4) 


Ph = hydraulic power (kW)

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

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 older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about


This page can be cited as

  • The Engineering ToolBox (2010). Hydraulic Pump Motor Sizing. [online] Available at: [Accessed Day Month Year].

Modify the access date according your visit.


3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter


Sponsored Links