REVERBERATION 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 Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface x Back Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface x Left Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface x Right Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface x Ceiling Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface x Floor Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface Metal or wood seats Upholstered seats Audience in seats Concrete-unpainted Concrete-painted Brick OC 703 - 2" OC 703 - 4" OC 705 - 2" OC 705 - 4" Terrazzo Wood floor Carpet on concrete Carpet on underlay Ac. tile suspended Ac. tile on concrete 1/2" Plasterboard Glass-large panes Glass-windows Marble or Tile Water Surface Metal or wood seats Upholstered seats Audience in seats 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.

Webmaster - johnsay