Online Calculators: milliWatts vs. dBm

Calculations: dBm vs. Watts

Using the calculations below you can convert dBm to watts and milliWatts. dBm is used to express an absolute value of power relative to a milliwatt.

Note: The final value represents a first order approximation and should only be used as a guide. No guarantees or warranties are implied accordingly.

milliwatts to dBm

Calculation Input

Calculation Results

Notes:

  • dBm = (10Log10(milliWatts))
  • 1 mW = 0 dBm

dBm to Watts

Calculation Input

Calculation Results

Notes:

  • Watts = 10((dBm - 30)/10)
  • milliWatts = 10(dBm/10)