Enter the actual output force (N), the effort force (N), and the mechanical advantage into the calculator to determine the Lever Efficiency.

## Lever Efficiency Formula

The following formula is used to calculate the Lever Efficiency.

Elever = OF / (EF * MA) * 100
• Where Elever is the Lever Efficiency (%)
• OF is the actual output force (N)
• EF is the effort force (N)
• MA is the mechanical advantage

To calculate the lever efficiency, divide the output force by the product of the effort force and the mechanical advantage, then multiply by 100.

## How to Calculate Lever Efficiency?

The following example problems outline how to calculate the Lever Efficiency.

Example Problem #1

1. First, determine the actual output force (N). In this example, the actual output force (N) is given as 50 .
2. Next, determine the effort force (N). For this problem, the effort force (N) is given as  25 .
3. Next, determine the mechanical advantage. In this case, the mechanical advantage is found to be 3.5.
4. Finally, calculate the Lever Efficiency using the formula above:

Elever = OF / (EF * MA) * 100

Inserting the values from above and solving yields:

Elever = 50 / (25*3.5) * 100 = 57.14 (%)

Example Problem #2

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

actual output force (N) = 60

effort force (N) = 13