top of page

Information on Hydraulic Pumps/Motors

Information on Hydraulic Pumps Motors_01.jpg

There are a number of formulas for figuring horsepower. Use the one that best suits your application.

Horsepower Calculation Formulas

Horsepower = (Gpm x Psi) / (1714 x E)

Horsepower = (Volts x Amps) / 745.7


Horsepower = (T x Rpm) / 5252

The above formulas can be used for estimating horsepower when:

Gpm = Gallons per minute
Psi = Pounds per square inch
E = Percentage of pump/motor efficiency
Rpm = Rotations per minute
T = Torque expressed in foot pounds

Hydraulic Pump Output Flow Calculation

This information is for estimating flow in gallons per minute. It's good to remember that: 1 gallon = 231 cubic inches.

Gallons per minute = (Rpm x d) / 231

The above formula can be used for estimating pump output flow where:
Rpm = Rotations per minute
d = Displacement in cubic inches

Please Note: We sell bars and chains for harvesters, but we do not sell harvesters, pumps, motors, nor do we work on them. The information above was provided by Oregon Cutting Systems.For more information, you may contact them at 503-653-888 or find them online at:

bottom of page