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Horsepower Calculator

for spur gears and helical gears
(Lewis Formula with Barth Revision)

Additional Resources Worm Gear Horsepower Info

Spur Gear Ratio & Center Distance

Type of Load: Duration: Gear Type: Pitch Type: Pitch Designation: Pitch: Pressure Angle: # of Teeth: Face Width:

«« (in) (mm)

RPM: Helix Angle: Material: Safe Stress

««You can type your own here.
(Safe stress can be taken as 1/3 of the ultimate strength.)
See Matweb.com for ultimate strength values.

Results:

Load in lbs @ pitch line
Safe static stress per sq. inch of material (lbs/sq. inch)
*Velocity (feet per minute)
Horsepower
Torque (inch lbs)
Gear OD
Gear PD
Service Factor (from load & duration)
*Special Considerations need to be taken if the Pitch Line VELOCITY exceeds: 1200 FPM for Metallic Spur Gears Or 2400 FPM for Helical Gears or Nonmetallic Spur gears

Information on this page is to be used as a guide. Consult an engineer for more information.

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Horsepower Calculator

for spur gears and helical gears (Lewis Formula with Barth Revision)

for spur gears and helical gears
(Lewis Formula with Barth Revision)