Percent to dB Formula and Calculator

This tool converts from Percentage (%) to deciBel (dB).

Enter the percent value below and the tool will calculate the equivalent value in dB

🔁 dB to Percent


AdB = 10*Log10(A%/100)

Example Calculation

  • 1% represents a linear value of 0.01 and equates to -20 dB
  • 10% represents a value of 0.1 and equates to -10 dB
  • 150% is equivalent to 1.5 in linear terms and equivalent to 1.76 dB

The conversion of percentage to decibels (dB) is a way to express relative changes in signal power, voltage, or intensity in logarithmic terms. This is common in various fields such as acoustics, electronics, and telecommunications where changes in power or intensity levels are often more manageable and intuitive to represent on a logarithmic scale rather than a linear scale.

Understanding the Concepts

Decibels (dB)

The decibel is a logarithmic unit used to express the ratio of two values, typically power or intensity. It is widely used because it can conveniently represent very large or very small ratios, making it easier to understand changes in levels.


A percent is a way of expressing a number as a fraction of 100. The term comes from the Latin “per centum,” which means “by the hundred.” The symbol for percent is “%”. Using percentages is a common method for comparing proportions, rates, and changes in various fields such as mathematics, finance, statistics, and everyday life.