How many dBm is 40 mW? 12/24/2016 – by Admin_VCEguide 0 How many dBm is 40 mW? A. 10 dBm B. 16 dBm C. 20 dBm D. 22 dBm E. 40 dBm SHOW ANSWERSCorrect Answer: B Explanation/Reference: