Loading page
About this tool
Convert decibels to linear amplitude, power and percentage in both directions, with the 20·log10 and 10·log10 rules shown.
dB To Percentage Converter turns a decibel value into the linear amplitude ratio, power ratio and percentage it represents, and converts back from any of them. It applies the two standard definitions from IEC 60027-3: dB = 20·log10(ratio) for amplitude quantities such as voltage, sound pressure and sample values, and dB = 10·log10(ratio) for power quantities such as watts and intensity. Useful when you need the actual multiplier for a gain node, a normalisation step or a spec sheet rather than a rule of thumb.
Open dB To Percentage Converter on AltFTool — it loads instantly in your browser.
Paste or upload your source content.
Choose the target format or conversion mode.
Copy or download the converted result.
Amplitude uses 20·log10 and power uses 10·log10 — the tool shows each side by side.
Enter a percentage or a raw gain multiplier and get the decibel value back.
Separates the physical ratio from the ~10 dB-per-doubling loudness rule of thumb.
About 50.1% in amplitude and 25.1% in power. The exact half-amplitude point is −6.0206 dB, which is why −6 dB is commonly described as halving the signal even though it is a fraction over.
They halve different quantities. −3.0103 dB halves power (10·log10 0.5), while −6.0206 dB halves amplitude (20·log10 0.5). Since power is proportional to amplitude squared, halving amplitude quarters the power.
Physically, +6.02 dB doubles amplitude and +3.01 dB doubles power. Perceptually, most listeners report a doubling of loudness at roughly +10 dB, which matches the sone scale where loudness doubles per 10 phon. The perceptual figure varies with level, spectrum and listener.
No. A fader's physical travel follows a taper chosen by the manufacturer, so halfway up is typically somewhere between −10 dB and −20 dB rather than −6 dB. Read the numeric dB readout on the channel rather than the slider position.
Add the dB To Percentage Converterwidget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
<iframe src="https://www.altftool.com/embed/widget/db-to-percentage-converter"
title="dB To Percentage Converter — free AltFTool widget"
width="100%" height="640" style="border:0;border-radius:12px;overflow:hidden"
loading="lazy" referrerpolicy="no-referrer-when-downgrade"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/tools/all/db-to-percentage-converter?utm_source=embed&utm_medium=widget">AltFTool — free online tools</a></p>