Decibel

Hop between ratios and dB like the RF calculators.

Applies the IEC/IEEE decibel definitions for power and amplitude so you can translate gain, attenuation, and percent change precisely.

Power

Mode

3.00 dB

1.9953

Ratio

Application presets

Remember: voltage or current ratios need 20·log10 while power uses 10·log10.

Inputs

Mode

Input type

Decibel value

Converted values

Decibels

3.00 dB

Power ratio

1.9953

Percent change

99.53%

Gain shortcuts

3 dB ≈ ×1.414 voltage (×2 power), 6 dB ≈ ×2 voltage, 20 dB ≈ ×10 voltage. Handy for sanity checks.

Field notes

Power amps, antennas, and filters all spec in dB. Keep the mode consistent to avoid 2× mistakes.

Design notes

When converting amplifier specs, include impedance context so power vs. voltage assumptions stay valid.
Add dB margins for cable losses, filter skirts, and compliance guard bands.
Document whether ratios are amplitude or power in your notebook to avoid future confusion.