Watts to dBm calculator
Convert RF power in watts into a logarithmic power level.
Formula
dBm = 10 × log10(P(W) × 1000)
Worked example
1 W equals 30 dBm, while 0.1 W equals 20 dBm.
Power must be greater than zero to compute its logarithm.
Use the interactive calculator when JavaScript is enabled.