dB to Decimal Conversion Calculator

This tool converts a deciBel number (dB) to its decimal equivalent.


Converting a decimal (which typically represents a power ratio) to decibels (dB) involves using logarithmic calculations. Decibels are a logarithmic unit used to express ratios, particularly in the fields of acoustics and electronics.

The output power divided by the input power is the decimal ratio

Pdecimal = POUT/PIN


PdB = 10*Log10(Pdecimal)


Pdecimal = 10(PdB/10)

Example Calculations

Let’s say an amplifier module amplifies the input signal power by 30 dB. 

In this case, the ratio of output to input power expressed as a decimal number is 1000.