What Is the Hydraulic Pump Flow, Power & Displacement Calculator?
Hydraulic pumps displace fluid volume to create flow; pressure is created only by resistance to that flow downstream in the circuit.
How Does the Hydraulic Pump Flow, Power & Displacement Calculator Work?
Flow in GPM is computed via (Displacement in³/rev × RPM) ÷ 231.
Hydraulic fluid horsepower is computed via (PSI × GPM) ÷ 1,714.
Input prime mover shaft horsepower is divided by overall mechanical efficiency.
Hydraulic Pump Flow, Power & Displacement Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Q (GPM) = (Displacement × RPM) ÷ 231, Drive HP = (Pressure × GPM) ÷ (1,714 × Efficiency)
Fluid horsepower equals pressure multiplied by flow divided by 1,714; drive power compensates for mechanical and volumetric efficiency.
How to Use the Hydraulic Pump Flow, Power & Displacement Calculator
- Enter pump geometric displacement.
- Enter shaft drive RPM.
- Enter system relief pressure and pump efficiency rating.
Step-by-Step Example Calculation
2.5 in³/rev Pump at 1,800 RPM and 2,500 PSI (85% Efficiency)
Input Values:
displacementCuIn:2.5
rpm:1800
pressurePsi:2500
efficiencyPct:85
Understanding Your Result
Shows output flow in GPM and L/min alongside required motor power in HP and kW.
Factors That Affect the Result
- Fluid viscosity, operating temperature, and volumetric slip at elevated pressures.
When Should You Use This Calculator?
- Sizing electric motors for industrial hydraulic presses, agricultural tractor implements, and log splitters.
Assumptions & Limitations
- Positive displacement pump operating within rated speed parameters.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard NFPA and ISO fluid power mechanical engineering equations.