Enter the RPM, the inches per tooth, and the number of flutes into the Chip Thinning Factor Calculator. The calculator will evaluate the Chip Thinning Factor. 

Chip Thinning Factor Formula

The following formula is used to calculate the Chip Thinning Factor. 



  • CTF is the Chip Thinning Factor (inches per minute)
  • RPM is the RPM 
  • IPT is the inches per tooth 
  • #F is the number of flutes 

To calculate the chip thinning factor, multiply the RPM by the inches per tooth, then multiply the result by the number of flutes.

How to Calculate Chip Thinning Factor?

The following steps outline how to calculate the Chip Thinning Factor.

  1. First, determine the RPM.
  2. Next, determine the inches per tooth. 
  3. Next, determine the number of flutes. 
  4. Next, gather the formula from above = CTF = RPM*IPT*#F.
  5. Finally, calculate the Chip Thinning Factor.
  6. 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.

RPM = 300

inches per tooth = .25

number of flutes = 3

CTF = RPM*IPT*#F =  ?