Enter the spindle RPM, the chip load, and the number of teeth into the Feed Rate Calculator. The calculator will evaluate the Feed Rate. 

Feed Rate Formula

The following formula is used to calculate the Feed Rate. 

FR = RPM * CL * #T

  • Where FR is the Feed Rate (in/min)
  • RPM is the spindle RPM 
  • CL is the chip load 
  • #T is the number of teeth 

How to Calculate Feed Rate?

The following two example problems outline the steps and information needed to calculate the Feed Rate.

Example Problem #1

  1. First, determine the spindle RPM.
    • The spindle RPM is calculated to be : 500.
  2. Next, determine the chip load. 
    • The chip load is measured to be: 30.
  3. Next, determine the number of teeth. 
    • The number of teeth is found to be: 60.
  4. Finally, calculate the Feed Rate using the formula above: 

FR = RPM * CL * #T

The values provided above are inserted into the equation below and computed.

FR = 500 * 30 * 60 = 900,000 (in/min)


Example Problem #2

The variables required for this problem are provided below:

spindle RPM = 600

chip load = 10

number of teeth = 20

Test your knowledge using the equation and check your answer with the calculator.

FR = RPM * CL * #T = (in/min)