Enter the bore size (in) into the Ring Gap Calculator. The calculator will evaluate the Ring Gap. 

Ring Gap Formula

The following two example problems outline the steps and information needed to calculate the Ring Gap.

RG = BS * .004


  • RG is the Ring Gap (in)
  • BS is the bore size (in) 

To calculate a ring gap, multiply the bore size by .004.

How to Calculate Ring Gap?

The following steps outline how to calculate the Ring Gap.

  1. First, determine the bore size (in). 
  2. Next, gather the formula from above = RG = BS * .004.
  3. Finally, calculate the Ring Gap.
  4. 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.

bore size (in) = 3.5

RG = BS * .004 = ?