Decibel Calculator

Calculate dB from power, voltage, or current ratios

Reference Value

Input Value

Unit

About Decibels

The decibel (dB) is a logarithmic unit used to express the ratio of two values. It's commonly used in acoustics and audio to describe sound levels and power ratios.

dB: Ratio of two values
dBm: Power relative to 1 milliwatt
dBW: Power relative to 1 watt