// 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.
W
mW
dBm
dBW
V
// Gain / Ratio Converter
Convert between power ratio, voltage ratio, and dB gain.
×
×
dB
Quick reference
+3 dB ≈ ×2 power, ×1.414 voltage
+6 dB ≈ ×4 power, ×2 voltage
+10 dB = ×10 power, ×3.162 voltage
+20 dB = ×100 power, ×10 voltage
−3 dB ≈ ×0.5 power (half power)
0 dBm = 1 mW = −30 dBW
30 dBm = 1 W | 0 dBW = 1 W
+3 dB ≈ ×2 power, ×1.414 voltage
+6 dB ≈ ×4 power, ×2 voltage
+10 dB = ×10 power, ×3.162 voltage
+20 dB = ×100 power, ×10 voltage
−3 dB ≈ ×0.5 power (half power)
0 dBm = 1 mW = −30 dBW
30 dBm = 1 W | 0 dBW = 1 W