S-Parameters › Converters
dB / Power Converter
Convert between dB, dBm, dBW, watts, milliwatts, and voltage ratios. Enter any value and everything else updates instantly.
Power Converter
Reference impedance Z₀ = 50 Ω for voltage calculations.
Power (Watts)
W
Power (milliwatts)
mW
dBm (ref 1 mW)
dBm
dBW (ref 1 W)
dBW
Voltage RMS (at 50Ω)
V
Gain / Ratio Converter
Convert between power ratio, voltage ratio, and dB gain.
Power Ratio (Pout/Pin)
×
Voltage Ratio (Vout/Vin)
×
Gain (dB)
dB
Quick reference
+3 dB ≈ ×2 power, ×1.414 voltage
+10 dB = ×10 power, ×3.162 voltage
+20 dB = ×100 power, ×10 voltage
0 dBm = 1 mW · 30 dBm = 1 W
+3 dB ≈ ×2 power, ×1.414 voltage
+10 dB = ×10 power, ×3.162 voltage
+20 dB = ×100 power, ×10 voltage
0 dBm = 1 mW · 30 dBm = 1 W