dB / dBm converter
Convert dBm, watts and RMS voltage (any impedance), and voltage / power ratios to dB.
Power
dBm0 dBm
Power1 mW
Vrms223.6 mVVpp ≈ 632.5 mV
Ratio ↔ dB
3 dB voltage ratio× 1.4125
3 dB power ratio× 1.9953
Results are for design reference only. Check the datasheet and measure.