Hydraulic Power Calculator Input Form

Hydraulic Motor Performance Calculator

Determine the true output (HP & Torque) of your hydraulic motor by accounting for internal losses (heat and friction).

1. Select Units

Imperial (PSI, GPM, HP, lb-ft)
Metric (Bar, L/min, kW, Nm)

2. Input Parameters

System Pressure (P):
PSI (or Bar)

Flow Rate (Q):
GPM (or L/min)

Motor Displacement (D):
in³/rev (or cc/rev)

Volumetric Efficiency (ηᵥ):
% (Typical: 88 – 95%)

Accounts for fluid leakage and reduces speed (RPM).

Mechanical Efficiency (ηₘ):
% (Typical: 90 – 98%)

Accounts for friction (seals, bearings) and reduces torque.

3. Calculation Results

Power Analysis:

Input Hydraulic Power (Theoretical): — HP/kW

Total Power Loss (Heat/Friction): — HP/kW

Actual Mechanical Power Output: — HP/kW

Performance Metrics:

Actual Output Torque: — lb-ft/Nm

Actual Output Speed: — RPM

Overall System Efficiency: — %

Summary: What Hydraulics Accomplish

Hydraulic systems are essential in concrete and heavy machinery applications due to their exceptional power density, precision control, and ability to generate massive torque at low speeds.

Torque at Demand: Maximum torque is available instantly, critical for starting heavy mixer drums or screws under load.
Infinitely Variable Speed: Speed can be adjusted smoothly from zero to maximum, ensuring precise material handling and dispensing.
Power Density: Hydraulics transfer significantly more power per weight unit than mechanical or electric drives, allowing for lighter, more efficient machine design.
Automatic Overload Protection: Relief valves prevent motor damage by limiting pressure when the load exceeds safe limits, protecting expensive components.

Tag: hydraulic

Hydraulic Horsepower Calculator