About the Decibel Calculator
A free tool for converting between decibels and power or amplitude ratios.
What it is
This calculator converts between a decibel value and its underlying ratio, supporting both the power/intensity formula (10ยทlogโโ) and the amplitude/pressure formula (20ยทlogโโ), solving in either direction depending on which field you leave blank.
Features
Power and amplitude modes
Correct formula for either type of quantity.
Solve either direction
dB to ratio, or ratio to dB.
Step-by-step
See the exact formula applied to your numbers.
Instant, private
Runs entirely in your browser. No data is sent anywhere.