Enter the volume of the room, absorption coefficient, and total surface area into the calculator to determine the reverb decay time. This calculator can also evaluate any of the variables given the others are known.

Reverb Decay Formula

The following formula is used to calculate the reverb decay time.

RT60 = 0.1611 * V / (A * S)


  • RT60 is the reverb decay time in secondsV is the volume of the room in cubic metersA is the absorption coefficientS is the total surface area of the room in square meters

To calculate the reverb decay time, multiply the volume of the room by 0.1611. Then divide this result by the product of the absorption coefficient and the total surface area of the room. The result is the reverb decay time in seconds.

What is a Reverb Decay?

Reverb Decay, also known as reverberation time or RT60, refers to the time it takes for the sound to decay by 60 decibels after the source of the sound has stopped. It is a measure of the persistence of sound in a particular space after the original sound is removed. This is a key factor in the perceived ambiance of a space and is often used in audio production and room acoustics to create or simulate different environments.

How to Calculate Reverb Decay?

The following steps outline how to calculate the Reverb Decay using the given formula:

  1. First, determine the volume of the room (V) in cubic meters.
  2. Next, determine the absorption coefficient (A).
  3. Next, determine the total surface area of the room (S) in square meters.
  4. Next, gather the formula from above: RT60 = 0.1611 * V / (A * S).
  5. Finally, calculate the Reverb Decay (RT60).
  6. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge:

Volume of the room (V) = 50 cubic meters

Absorption coefficient (A) = 0.8

Total surface area of the room (S) = 30 square meters