dBm to Watt Converter
Convert RF power between dBm, milliwatts and watts, and turn dB gain or loss into a linear ratio. Everything runs in your browser.
dBm to power
- Watts (W)
- Milliwatts (mW)
- Microwatts (µW)
Power to dBm
dB gain / loss to ratio
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dBm, watts and the 10 dB rule
dBm is power referenced to 1 milliwatt on a logarithmic scale: 0 dBm = 1 mW, 30 dBm = 1 W. The formula is P(W) = 10^((dBm − 30) / 10). Because it is logarithmic, every 10 dB is a 10× change in power and every 3 dB is roughly double or half.
Power vs voltage ratio
A gain in dB maps to a power ratio of 10^(dB/10) and a voltage (amplitude) ratio of 10^(dB/20). Antenna gain, cable loss and receiver sensitivity in a link budget are all expressed in dB for exactly this reason: gains and losses simply add up.
