dB to Watts Calculator, Formula, dB to Watts Calculation

dB to Watts Calculator:

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

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:

1. 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.

2. 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: