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Decibel to voltage and power ratio converter
Convert decibels to voltage, pressure and power ratios and back.
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- No sign-up
- Works on any device
About Decibel to voltage and power ratio converter
Move between decibels and plain ratios. Power ratios use 10 times log10, while voltage, current and sound pressure use 20 times log10, because power goes with the square of amplitude. So 3 dB is a doubling of power but only about 1.41 times the voltage. Useful in audio, RF and electronics.
How to use Decibel to voltage and power ratio converter
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
Why is it 20 log for voltage but 10 log for power?
Power is proportional to voltage squared. Taking the log of a square doubles the exponent, which turns 10 times log into 20 times log.
Is Decibel to voltage and power ratio converter free?
Yes. Decibel to voltage and power ratio converter on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.