Hydraulic Power Unit Calculator

Size a complete hydraulic power unit including pump, electric motor, and reservoir from circuit pressure and flow demands.

Required pressure (PSI)

Required flow (GPM)

Pump efficiency

Electric motor RPM

Duty cycle

Reservoir multiplier (×GPM)

Number of actuators

Tab to move between fields

Electric motor (HP)

Calculated motor HP20.59

Hydraulic HP17.5

Pump displacement (in³/rev)1.32

Reservoir size (gal)30

Heat generated (BTU/hr)14,310

Motor current at 460V 3Φ (A)27.5

Annual energy cost ($)$3,357.00

Actual Flow10

Heat Kw4.19

Motor Amps230v55.08

Suction Line Dash16

How to Use This Calculator

How the result changes with Required pressure (PSI)

Required pressure (PSI): Maximum system operating pressure.
Required flow (GPM): Total simultaneous flow demand from all actuators.
Pump efficiency: Overall pump efficiency (80-92% typical for gear/piston pumps).
Electric motor RPM: Electric motor speed (1750 RPM typical for 4-pole motor).
Duty cycle: Percentage of time the system is under load.
Reservoir multiplier (×GPM): Reservoir volume as multiple of pump GPM (3× standard, 2× compact, 1× mobile).
Number of actuators: Number of cylinders or motors in the circuit.

Electric motor (HP): Next standard NEMA motor size above calculated requirement.
Calculated motor HP: Exact HP needed accounting for pump losses.
Hydraulic HP: Useful hydraulic power (PSI × GPM / 1714).
Pump displacement (in³/rev): Required pump displacement at the specified RPM.
Reservoir size (gal): Recommended standard reservoir capacity.
Heat generated (BTU/hr): Waste heat from pump inefficiency at duty cycle.
Motor current at 460V 3Φ (A): Estimated full-load amps at 460V three-phase.
Annual energy cost ($): Estimated yearly electricity cost at $0.12/kWh, 2000 hrs/yr.

Identify Input Parameters
4 parameters
Required pressure (PSI) = 3000, Required flow (GPM) = 10, Pump efficiency = 85, Electric motor RPM = 1750 = 7 input(s) provided
Calculate Electric motor
Electric motor
25 = 25
Calculate Calculated motor HP
Calculated motor HP = hydraulicHp / pumpEff
20.59 = 20.59
Calculate Hydraulic HP
Hydraulic HP = (requiredPsi * requiredGpm) / 1714
17.5 = 17.5