Hydraulic Motor Torque Calculator
Torque, shaft speed and power of a hydraulic motor from pressure, displacement and flow.
Results
Torque
210.85
N·m
Rotational speed
500
rpm
Power
11.040
kW
What this tool does
In a hydraulic drive, pressure sets the torque and flow sets the speed, and the two are almost independent of each other. That is what makes hydraulics so useful for heavy machinery: full torque is available from zero rpm.
Formula
M = p × V ÷ (2π) × η
Variables
| Symbol | Meaning | Unit |
|---|---|---|
p | Pressure | bar |
v | Displacement per revolution | cm³/rev |
ef | Efficiency | % |
q | Flow rate | L/min |
M | Torque | N·m |
N | Rotational speed | rpm |
PW | Power | kW |
Worked example
- Pressure180 bar
- Displacement per revolution80 cm³/rev
- Efficiency92 %
- Flow rate40 L/min
- Torque210.85 N·m
- Rotational speed500 rpm
- Power11.040 kW
Limitations
- The formula assumes ideal conditions: no friction losses, no air resistance and no efficiency losses unless you enter them.
- For work that must comply with a standard or be signed off, check the result against the applicable code and have it reviewed by a qualified engineer.