__dB to Watts Calculator:__

__dB to Watts Calculator:__

Enter the values of decibel-milliwatts, dBm to determine the value of Power, P_{(W)}.

__dB to Watts Formula:__

__dB to Watts Formula:__

Power, P_{(W)} in watts is calculated by subtract 30 from the decibel-milliwatts, dBm, divide the result by 10, then take a value of 10 and raise it to the power of the result.

Power, P_{(W)} = 10^{(dBm – 30 / 10)}

P_{(W)} = power in watts, W.

dBm = decibel-milliwatts.

__dB to Watts Calculation:__

__dB to Watts Calculation:__

- Given a power of 40 dBm, calculate the equivalent power in watts.

dBm = 40.

Power, P_{(W)} = 10^{(dBm – 30 / 10)}

P_{(W)} = 10^{(40 – 30 / 10)}

P_{(W)} = 10W.

- If the power is 0.01 watts, calculate the power level in dBm.

Given: P_{(W)} = 0.01W.

0.001 is the reference power in milliwatts (mW) (1 mW is equal to 0.001 W)

Power, P_{(W)} = 10^{(dBm – 30 / 10)}

dBm = 10 * log10(P/0.001)

dBm = 10 * log10(10)

dBm = 10 * 1 (since log10(10) = 1)

dBm = 10.

__dBW to Watts Conversion for UK Radio Amateur Examination:__

__dBW to Watts Conversion for UK Radio Amateur Examination:__