Decibel Converter
dB ↔ ratios and dBm reference conversions.
Quantity
Direction
Result
3.01 dB
What is this tool?
Decibels express ratios on a log scale: power ratios use 10·log10, voltage (same impedance) use 20·log10. dBm is power relative to 1 mW. This converter switches between those representations for quick checks.
How to use it
- Choose the conversion type (power ratio, voltage ratio, or dBm).
- Enter the known value.
- Read the converted result.
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