Conversion dBm – Watt

Calculator


dBm

Watts

Enter one value and click "Calculate". The other value will be computed for you automatically. You may enter values in engineering notation (eg: 4.5E-9).

How to convert:

Watt to dBm

Power P(dBm) in dBm is equal to 10 times the base 10 logarithm of the power P(W) in Watt(W) + 30:

P(dBm) =  10 · log10( P(W)) + 30

dBm to Watt

Power P(W) in Watt is equal to 10 to the power of Power(dBm) divided by 10 with the result divided by 1000:

P(W) =  10 ^ (P(dBm)/10) /1000