Enter the output torque (N-m), the input torque (N-m), and the gear ratio into the calculator to determine the Gearbox Efficiency Calculator. 

Gearbox Efficiency Calculator Formula

The following formula is used to calculate the Gearbox Efficiency Calculator.

Egear = OT / (IT * GR) *100
  • Where Egear is the Gearbox Efficiency Calculator (%)
  • OT is the output torque (N-m) 
  • IT is the input torque (N-m) 
  • GR is the gear ratio 

To calculate the gearbox efficiency, divide the output torque by the product of the input torque and the gear ratio, then multiply by 100.

How to Calculate Gearbox Efficiency Calculator?

The following example problems outline how to calculate the Gearbox Efficiency Calculator.

Example Problem #1

  1. First, determine the output torque (N-m). In this example, the output torque (N-m) is given as 100 .
  2. Next, determine the input torque (N-m). For this problem, the input torque (N-m) is given as  30 .
  3. Next, determine the gear ratio. In this case, the gear ratio is found to be 4.
  4. Finally, calculate the Gearbox Efficiency Calculator using the formula above: 

Egear = OT / (IT * GR) *100

Inserting the values from above and solving yields: 

Egear = 100 / (30 * 4) *100 = 83.33 (%)

Example Problem #2

Using the same method as above, determine the variables required by the equation. For this example problem, these are provided as:

output torque (N-m) = 150

input torque (N-m) = 50

gear ratio = 5

Enter these given values yields: 

Egear = 150 / (50 *5) *100 = 60 (%)