Hydraulic Calculators

We have gathered our most popular tools and combined them into one "All-in-One" Engineering App! Now, within a single, fast panel on our website, you can seamlessly switch between tabs and calculate in a fraction of a second:

  • Cylinder force (push and pull)
  • Speed and cycle time (in seconds)
  • Pump drive power (required kW and HP)
  • Actual flow rate (converting cm³/rev to L/min)
  • Oil tank capacity (proper cooling)

Cylinder Force Calculator

Calculate pushing and pulling force.

Pushing force: 0 kg

Pulling force: 0 kg

*Results assume 100% mechanical efficiency.

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Speed and Cycle Time

Calculate full extension and retraction time.

Extension speed: 0 cm/s

Extension time: 0 s

Retraction speed: 0 cm/s

Retraction time: 0 s

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Pump Drive Power

Select an electric/combustion engine.

Required engine power: 0 kW

Equivalent: 0 KM / HP

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Pump Flow

Calculate L/min based on displacement.

Actual flow: 0 L/min

Theoretical flow: 0 L/min

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Oil Reservoir Capacity

Ensure proper oil cooling.

Recommended capacity: 0 liters

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FAQ – Frequently asked questions - Hydraulic calculators

1. Are BRhydraulic calculators free to use?

Yes, all our engineering tools are 100% free, require no login, and no external applications to download. They work directly in your browser, on both desktop and smartphone.
2. Are the results provided by calculators 100% accurate?

Calculators are based on universal physical and engineering formulas. They take into account standard losses (e.g., default gear pump efficiency of 85-95%). Please remember, however, that actual results on the machine may vary slightly depending on the degree of component wear, oil viscosity, ambient temperature, and frictional resistance in the machine's mechanisms. Treat the results as highly precise estimated values.
3. Why is the pulling force of the cylinder always less than the pushing force?

This results directly from the actuator's design. When pushing, pressurized oil acts on the entire piston surface. When pulling (the actuator retracts), part of this surface is occupied by the piston rod. The oil therefore has a smaller pressure surface, which physically translates into less force generated by the actuator at the same pressure.
4. The calculator computed the engine power for me. Can I buy an engine with these exact parameters?

We definitely do not recommend buying an engine "just enough". The calculator result is the power needed for the system's operation itself. Engines (especially electric ones) need a reserve for the so-called starting current and to overcome initial resistance (e.g., thick, cold oil in winter).

  • For electric motors, always add approx. 10-15% reserve.
  • For combustion engines, we recommend a reserve of 20-30%.
5. The calculator recommends a 150-liter tank, but I don't have space for it on the machine. What should I do?

This is a very common problem in mobile machinery (e.g., wood chippers, drilling rigs, small log splitters). If you physically cannot mount a tank with the capacity recommended by our calculator (which must cool and de-aerate the oil), it will be necessary to use an oil cooler. Forced air circulation from the cooler's fan will compensate for the lack of a large heat dissipation surface from the steel walls of a large tank.
6. How do I know the efficiency of my old pump?

For used pumps that have been in operation for several years, a safe value of around 80-85% is assumed. Hydraulic pumps wear out over time (internal clearances between the gears and the housing increase), which causes internal leaks. If an old pump heats up excessively and has clearly lost its dynamics, its efficiency may be even lower – in such a situation, we recommend replacing the pump with a new one.
7. I have the results from the calculator. Can you help me compile a parts list based on them?

Absolutely! That's why we created these tools. If you already know the performance you need for a pump, motor, or actuator, please contact our technical department. Our engineers will verify your calculations free of charge and prepare a basket with suitable valves, hoses, and components from the BRhydraulic store that will work perfectly together.