Gear Oil Viscosity Calculator

We often have gear boxes where the correct viscosity gear oil is not known either because it is a used box and came without the manual, or it is now being used in a different setup from its original design.

This calculator can be used to determine the right viscosity for the gear box with under the conditions we determine. This provides a starting point. The viscosity can be modified slightly up or down until you have the reducer working at its lowest temperature.

To use the calculator:

  • Select the type of lubrication: Splash or circulation
  • Select the type of reduction: Simple or multiple
  • Select the horsepower range
  • Select the speed

The correct oil viscosity will be shown in the results.