Enter the total engaged length (mm) and the total overall length (mm) into the Thread Percentage Calculator. The calculator will evaluate the Thread Percentage. 

Thread Percentage Formula

The following two example problems outline the steps and information needed to calculate the Thread Percentage.

TP = EL / OL * 100


  • TP is the Thread Percentage (%)
  • EL is the total engaged length (mm) 
  • OL is the total overall length (mm) 

To calculate the thread percentage, divide the total engaged length by the overall length, then multiply by 100.

How to Calculate Thread Percentage?

The following steps outline how to calculate the Thread Percentage.

  1. First, determine the total engaged length (mm). 
  2. Next, determine the total overall length (mm). 
  3. Next, gather the formula from above = TP = EL / OL * 100.
  4. Finally, calculate the Thread Percentage.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total engaged length (mm) = 1.25

total overall length (mm) = 2

TP = EL / OL * 100 = ?