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The Reverberation Time Calculator

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This page will calculate reverb time, for the home theatre room you input here. The results show the inter-relationship between reverberation time and room finishes. This calculator is provided as an educational tool to demonstrate this relationship, and any use made of the information here is done at the sole risk of the user. (Let's face it, if it were really this easy would we be giving the information away for free?) Work your way down the page, inputting data where indicated, then push the button to calculate the results. Caveat

Input Room Data

Room Details

Input the room dimensions and the additional acoustical finishes in this section. This calculator is based on the Sabine reverberation equation, which makes certain assumptions about the distribution of acoustical treatment or absorptive surfaces. This has been done to keep this a fairly simple calculator. Difficult acoustic spaces will require more detailed reverberation calculations to ensure an accurate prediction of acoustical and sound system performance. The absorption values for the materials shown here are also based on a specific example of each type, and for a specific mounting method, and cannot be generalized across all materials of this type. Room shape will also affect the sound reproduction, as focusing surfaces and late reflections will dramatically degrade room acoustics, as will exterior or interior noise sources. It would be a very bad idea to stretch these assumptions to cover a specific application of your own, as large errors would be possible. Problems with many variables, such as predicted acoustical performance, cannot be generalized effectively. (Ok class, first of all, let's assume spherical cows...")

Room length
in Metres

Room width
in Metres

Room height
in Metres

Carpet w/underpad
in square Metres

Ceiling tile
in square Metres

25mm fibreglass
in square Metres

Number of
Seated Audience

You can change the values and re-calculate.
Reverb time results

Reverb Time

This is the reverb time you would expect to see in an unfurnished room with gypsum wallboard walls and ceilings, a concrete floor plus the carpet, ceiling tile, acoustical treatment and audience added. If the basic room materials are different than described, the resulting acoustical characteristics will be very different than predicted here.

125Hz RT60
in Seconds

250Hz RT60
in Seconds

500Hz RT60
in Seconds

1,000Hz RT60
in Seconds

2,000Hz RT60
in Seconds

4,000Hz RT60
in Seconds

©1997 Mc2Systems Design Group

It is possible to input data into this calculator that will result in invalid or erroneous results. This information is provided for educational puposes only, with no warranty of its accuracy, or applicability, and any use made of this information is done so at the sole risk of the user. Rather than take that risk, you should be hiring an acoustical consultant.
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Mc Squared System Design Group, Inc Mc Squared System Design Group, Inc
323 - 901 West 3rd Street
North Vancouver, BC V7P 3P9
Phone 604 - 986 - 8181