Hydraulic Pump Sizing Calculator
Calculate the hydraulic pump size required to achieve a target flow at a given RPM.
Enter Flow & RPM
Formula
Displacement (cc/rev) = Flow (L/min) × 1000 ÷ RPM
Required displacement is adjusted for volumetric efficiency.
Use 100% efficiency for theoretical displacement. Use a lower efficiency to estimate a larger real-world pump size.
Displacement Results
Required Pump Displacement
— cc/rev
— in³/rev
Theoretical @ 100%
— cc/rev
Efficiency Used
— %
Flow Used
— L/min
US GPM
— GPM
Important Note
Pump selection should be confirmed against manufacturer specifications, pressure rating, shaft speed limits, drive torque, inlet conditions, oil viscosity and duty cycle.