Enter the differential gain and the common mode gain into the Calculator. The calculator will evaluate the CMRR (common mode rejection ratio). 

CMRR (common mode rejection ratio) Formula

CMRR = Adiff/Acom


  • CMRR is the CMRR (common mode rejection ratio) ()
  • Adiff is the differential gain
  • Acom is the common mode gain

To calculate CMRR (common mode rejection ratio), divide the differential gain by the common mode gain.

How to Calculate CMRR (common mode rejection ratio)?

The following steps outline how to calculate the CMRR (common mode rejection ratio).

  1. First, determine the differential gain. 
  2. Next, determine the common mode gain. 
  3. Next, gather the formula from above = CMRR = Adiff/Acom.
  4. Finally, calculate the CMRR (common mode rejection ratio).
  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.

differential gain = 7.2

common mode gain = 8.9