RF Engineering
dBm to Watts, dBi vs dBd and dBc: Every RF Decibel Explained (with Conversion Tables)
0 dBm is 1 mW and +30 dBm is 1 watt, so every 10 dB is a tenfold change in power and every 3 dB roughly doubles or halves it. Here is what dB, dBm, dBW, dBi, dBd and dBc each mean, how to convert dBm to watts in both directions, a full conversion table, the dBi to dBd offset, EIRP, and the mistakes that trip people up.