Room Reverb / Sabine Calculator and Charts

A quick tool for helping you calculate the reverb time of your room across six octaves.

This Room Reverberation Time Calculator will help you calcuate the Reverb Time (RT60) of your room. Remember that this is just a mathematical model, and your room most certainly will have quirks that are beyond the scope of this calculator.

Fill in the dimensions of your room & click submit.
Scroll down a bit and fill in the chart using the numbers you obtained for the surface area of your room.
Then fill in the Sabine values using the reference below.
Click the Submit button below the chart.

Any This Color boxes will be calculated for you. You can input your room dimensions and calculate your floor, ceiling, and wall surface areas into This Color boxes.

Room Dimensions	Room Surface Area
Length	Floor
Width	Ceiling
Height	Walls	+ + + =
Meters Feet

Material	Surface Area*	125hz		250hz		500hz		1000hz		2000hz		4000hz
Type	(S)	Sabine	Sa	Sabine	Sa	Sabine	Sa	Sabine	Sa	Sabine	Sa	Sabine	Sa







Total	Volume:

* Surface Area in feet or Quantity

Sabine Units of Common Materials (Given Per Square Foot or Per Unit)
Material	125Hz	250Hz	500Hz	1kHz	2kHz	4kHz
Carpet
- heavy on concrete	0.02	0.06	0.14	0.37	0.60	0.65
- heavy on 40oz hair felt	0.08	0.24	0.57	0.69	0.71	0.73
- heavy with latex backin on foam or 40hz hair felt	0.08	0.27	0.39	0.34	0.48	0.63
- outdoor/indoor	0.01	0.05	0.10	0.20	0.45	0.65
Wood Floor	0.15	0.11	0.10	0.07	0.06	0.07
Concrete Floor	0.01	0.01	0.015	0.02	0.02	0.02
Linoleum, Asphalt-tile, or cork tile on concrete	0.02	0.03	0.03	0.03	0.03	0.02
Foam backed carpet on concrete	0.05	0.16	0.44	0.70	0.60	0.40
Heavy carpet + heavy foam underlay on concrete	0.15	0.25	0.50	0.60	0.70	0.80
Vinyl flooring	0.03	0.04	0.05	0.04	0.05	0.05

Gypsum board: 1/2" on 2 x 4s, 16" on centers (plasterboard)	0.29	0.10	0.05	0.04	0.07	0.09
9mm Plasterboard over 20mm air gap	0.30	0.2	0.15	0.05	0.05	0.05
Plaster, gypsum or lime smooth finish on tile or brick	0.013	0.015	0.02	0.03	0.04	0.05
Plaster: gypsum or lime, smooth finish on lath	0.14	0.10	0.06	0.05	0.04	0.03
Concrete Block, course	0.36	0.44	0.31	0.29	0.39	0.25
Concrete Block, painted	0.10	0.05	0.06	0.07	0.09	0.08
Plaster on brick	0.013	0.015	0.02	0.03	0.04	0.05
Brickwork	0.05	0.04	0.02	0.04	0.05	0.05

Owens-Corning Frescor, painted, 5/8" thick Mounting 7 Drop Ceiling	0.69	0.86	0.68	0.87	0.90	0.81

Drapes cotton 14oz/sq yd
- draped to 7/8 area	0.03	0.12	0.15	0.27	0.37	0.42
- draped to 3/4 area	0.04	0.23	0.40	0.57	0.53	0.40
- draped to 1/2 area	0.07	0.37	0.49	0.81	0.65	0.54
Cotton drapes draped to half area. 15oz/sq yd	0.07	0.37	0.49	0.81	0.65	0.54
Drapes medium velor, 18oz sq yd draped to 1/2 area	0.14	0.35	0.55	0.72	0.70	0.65

Acoustical tile, average 1/2" thick	0.07	0.21	0.66	0.75	0.62	0.49
Acoustical tile, average 3/4" thick	0.09	0.28	0.78	0.84	0.73	0.64
50mm Acoustic Foam	0.08	0.25	0.60	0.90	0.95	0.90
100mm Acoustic Foam	0.20	0.70	0.99	0.99	0.99	0.99
50mm Mineral Wool (Med Density)	0.20	0.45	0.70	0.80	0.80	0.80

Plate glass	0.18	0.06	0.04	0.03	0.02	0.02
6mm glass	0.10	0.06	0.04	0.03	0.02	0.02
Window glass	0.35	0.25	0.18	0.12	0.07	0.04

Breeze block	0.25	0.40	0.60	0.50	0.75	0.50
LF panel absorber	0.28	0.22	0.17	0.09	0.10	0.11
Perforated Helmholz absorber, 4-inch depth, mineral wool damping, 0.79% perforation.	0.40	0.840	0.40	0.160	0.140	0.12
Perforated Helmholz absorber,8-inch depth, mineral wool damping, 0.79% perforation.	0.98	0.88	0.52	0.21	0.16	0.14
Broad-band absorber, 1-inch fibreglass slab at mouth of 7-inch deep cavity	0.67	0.98	0.98	0.93	0.98	0.96

Padded seat (unoccupied)	0.10	0.20	0.25	0.30	0.40	0.30
College students informally dressed seated in tablet arm chairs (per person)	-	2.5	2.9	5.0	5.2	5.0
Audience seated, depending on spacing and upholstry of seats (per person)	2.5	3.5	4.0	4.5	5.0	4.5
Audience seated, depending on spacing and upholstry of seats (per person)	4.0	5.0	5.5	6.5	7.0	7.0