Dynamic Range Converter
Convert between decibels, amplitude/voltage ratio, and power/intensity ratio with their logarithmic relationships.
How to use
- Choose dB, amplitude/voltage ratio, or power/intensity ratio as the input type, enter the value, and calculate all three forms.
Capabilities and scope
The dedicated runner displays dB, amplitude ratio, and power ratio together and distinguishes amplitude-like from power-like logarithmic factors.
How it works
For dB input, amplitude=10^(dB/20) and power=10^(dB/10); amplitude input uses 20·log10(ratio), while power input uses 10·log10(ratio).
Example
An input of 20 dB produces an amplitude ratio of 10× and a power ratio of 100×.
Useful for
- Compare dB and linear ratios in audio or signal data
- See how voltage/amplitude and power ratios differ for the same dB value
Before you use it
- Linear ratios must be greater than zero and dB input must be finite.
- The physical meaning of dB depends on the compared quantity and reference, so this tool does not recover an absolute pressure or power level.
Standards and references
Frequently asked questions
Why does amplitude use 20 log10 while power uses 10 log10?
The runner uses the relationship where power ratio is the square of amplitude ratio, which produces the two logarithmic factors.