Hydraulic Pump Flow Calculator
Flow delivered by a pump and the drive power it needs at a working pressure.
Results
Flow rate
34.44
L/min
Power
9.183
kW
Flow rate
2.066
m³/h
What this tool does
A positive displacement pump moves a fixed volume per revolution, so flow follows speed almost exactly, less a few percent of internal leakage. The drive power comes from flow times pressure, and it is what decides the motor on the other end of the coupling.
Formula
Q = V × n × η ÷ 1000
Variables
| Symbol | Meaning | Unit |
|---|---|---|
v | Displacement per revolution | cm³/rev |
n | Rotational speed | rpm |
ef | Volumetric efficiency | % |
p | Pressure | bar |
Q | Flow rate | L/min |
PW | Power | kW |
QH | Flow rate | m³/h |
Worked example
- Displacement per revolution25 cm³/rev
- Rotational speed1450 rpm
- Volumetric efficiency95 %
- Pressure160 bar
- Flow rate34.44 L/min
- Power9.183 kW
- Flow rate2.066 m³/h
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.