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RT60 = k(V/Sa)

  • k is a constant that equals 0.161 when the units of measurement are expressed in meters and 0.049 when units are expressed in feet.
  • Sa is the total surface absorption of a room expressed in sabins. It is a sum of all the surface areas in the room multiplied by their respective absorption coefficients. The absorption coefficients express the absorption factor of materials at given frequencies.
  • V is the volume of the room
RT60 Calculator

Enter the measurements of your room. Make sure you specify the units.

Width Length Height

feet meters

Walls Material Windows,Doors and other Surfaces
Material Size How Many
Front x
Back x
Left x
Right x
Ceiling x
Floor x


125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz

Estimated RT60 of your room is seconds


The author was Piotr Filipowski (Just trying to give credit where credit is due) Its Java script which I haven't learnt as yet. I have his permission to use this great chart.

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