Hydraulic Calculators

With Hydrastore's handy hydraulic calculators there's no need for formulas and manual calculations.

Hydrastore is a leading supplier of hydraulic systems and components; and with this status we also have a dedicated team of specialist customer service representatives. We aim to answer any question you may have and we strive to make you life as a hydraulic engineer as simple as it can be. That's why we've put together these easy to use hydraulic calculators, saving you time when you're designing your hydraulic systems.

Just plug in the numbers you know, or have calculated, and we'll calculate the rest for you. Why not bookmark this page for an easy reference in the future.

Flow Rate (l/min)
Flow Rate (l/min) Pumps and Motors FormulaeDisplacement (cm³/rev)
Shaft Speed (rev/min)
Flow Rate (l/min)
Note: component efficiencies need to be considered for a more precise analysis
Shaft Torque (Nm)
Shaft Torque (Nm) Pumps and Motors FormulaeDisplacement (cm³/rev)
Pressure Drop (bar)
Torque (Nm)
Note: component efficiencies need to be considered for a more precise analysis
Shaft Power (kW)
Shaft Power (kW) Pumps and Motors FormulaeTorque (Nm)
Shaft Speed (rev/min)
Power (kW)
Note: component efficiencies need to be considered for a more precise analysis
Hydraulic Power (kW)
Hydraulic Power (kW) Pumps and Motors FormulaeFlow Rate (l/min)
Pressure (bar)
Power (kW)
Note: component efficiencies need to be considered for a more precise analysis
Force (N)
Force (N) Cylinders FormulaePressure (bar)
Area (cm²)
Force (N)
Note: component efficiencies need to be considered for a more precise analysis

Velocity (m/s)
Velocity (m/s) Cylinders FormulaeFlow Rate (l/min)
Area (cm²)
Velocity (m/s)
Note: component efficiencies need to be considered for a more precise analysis
Area (cm²)
Area (cm²) Cylinders FormulaePipe Diameter (mm)
Area (cm²)
Note: component efficiencies need to be considered for a more precise analysis
Reynolds Number
Reynolds Number Flushing Formulae
Flushing is a process designed to remove dirt introduced into the system during manufacture, assembly and initial operation. It is also used when significant maintenance is undertaken. The requirements are summarised below:
- A turbulent flow regime to pick-up the particles from the walls of components and transport them to the flushing filter.
- The Reynolds number (Re) defines the flow condition and should be greater than 4,000.
Flow Rate (l/min)
Viscosity (cSt)
Pipe Diameter (mm)
Reynolds Number
- Or, to achieve Re >= 4,000 Q > 0.189 x v x d
- A ‘fine’ filter to capture transported particles quickly and effectively
Velocity of Fluid in Pipe (m/s)
Velocity of Fluid in Pipe (m/s)Pipes & Hoses FormulaeFlow Rate (l/min)
Pipe Diameter (mm)
Velocity (m/s)
Recommended fluid velocity ranges:
Suction lines: 0.625m/s – 1.25m/s
Pressure lines: 2.1m/s – 4.75m/s
Return lines: 1.5m/s - 3m/s
Based on oils having a maximum viscosity grade of 70 cSt at 38°C and operating between 18°C and 51°C.
Note: For pipe runs greater than 10m the pipe size should be increased correspondingly. The intake line should never exceed 1m in length.
Voltage/Current/Resistance/Power
Voltage/Current/Resistance/PowerElectronics Formulae
Please input 2 values to calculate the others
Voltage (volts)
Current (amps)
Resistance (ohms)
Power (watts)

Disclaimer:

Every precaution has been made to make sure the above calculators and their outputs are accurate. However, we cannot guarantee the calculations you make are appropriate for your applications and online calculations could produce erroneous figures. If you do see figures that you are unsure about, please don't hesitate to contact us.

Get in touch to discuss your requirements

Telephone: 01427 874445
Email: sales@hydrastore.co.uk

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