Feature$19 once
Reverb report
The reverberation time of a room by octave band, against a target, as a printable report.
Use this add-on:
Overview
Reverb report is a panel in BimCraft for a quick answer to "how long will sound linger in this room?". Type the room's length, width and height, pick the floor, wall and ceiling finishes, add the people, and it gives the reverberation time in each octave band from 125 Hz to 4 kHz by the Sabine and Eyring formulas. Compare it with a target and download a one-page report to attach to a drawing set. It is made by The Data Design Group, Inc.
Who it’s for
- Architects and designers choosing finishes for classrooms, meeting rooms and offices.
- Small studios that need a short written reverberation note without a full acoustics program.
What you can do
- Enter a room by hand and see Sabine and Eyring reverberation times for six octave bands.
- Pick floor, wall and ceiling finishes from nine typical finishes and add the number of people.
- Set a mid-frequency target and see whether the room meets it.
- Download a one-page HTML report with the room, the finishes, the table and the design-aid note.
Methods and standards
Sabine's formula T = 0.161 V / (A + 4mV) and Eyring's formula T = 0.161 V / (−S ln(1 − ᾱ) + 4mV), where V is the volume, S the surface area, A the absorption in square metres of sabins, ᾱ the average absorption and m the air absorption. Both assume a diffuse sound field. Air absorption is for 20 °C and 50 % humidity, rounded from the ISO 9613-1 tables. The mid-frequency value is the mean of the 500 Hz and 1 kHz Eyring times.
Data and sources
The nine finishes use typical absorption coefficients from textbook reverberation-room tables, rounded, and an absorption of 0.25 to 0.50 square metres of sabins per seated adult. They are defaults to review, not a product's measured data. The room is not read from the model: you type its size.
Verification
| Case | Result |
|---|---|
| Eyring and Sabine against hand calculation, 6 × 5 × 2.8 m concrete room | The tool's 500 Hz Eyring time equals the formula worked in the test to 9 decimal places; volume 84 m³ and surface 121.6 m² checked |
| Finishes and people move the result the right way | Carpet, gypsum walls and a tiled ceiling cut the mid-frequency time to under half; adding 30 people cuts it further |
Limits
A design aid, not an engineering approval. It treats the room as one box with a diffuse sound field, so it does not suit long, tall, coupled or oddly shaped rooms, and below the Schroeder frequency the result is only a guide. The absorption values are typical, not a product's. The Data Design Group, Inc. does not hold the liability for a design: a licensed acoustician or engineer must review your drawings and results.
Files and formats
Writes one HTML file, reverb-report.html, that opens in any browser and prints to PDF. It reads no files and sends nothing over the network.
Get started
- Buy it from the Library and switch it on in BimCraft under Settings › Add-ons.
- Open the Reverb report panel, type the room's size and pick its finishes.
- Press Download the report.
Languages
No languages are listed for this add-on yet. Its maker may add some.
Works in
| Edition | Works | Note |
|---|---|---|
| Browser (/use) (yours) | Added on demand | Fetched the first time you use it, then kept for offline use. |
| Studio from getcadcraft.com | Added on demand | Fetched the first time you use it, then kept for offline use. |
| Microsoft Store | No | Waiting on a store-policy check before paid items show in the Microsoft Store app. Use the browser apps or Studio from getcadcraft.com. |
| Google Play | No | Paid items are bought on getcadcraft.com and are not shown in the Google Play app. Use the browser apps or the Studio APK from getcadcraft.com. |
| iPad and iPhone (App Store) | No | Paid items are bought on getcadcraft.com and are not shown in the iPad and iPhone app. Use the browser apps or Studio from getcadcraft.com. |
| Custom build | Added on demand | Fetched the first time you use it, then kept for offline use. |
Comes with
Nothing else.
Versions
| Version | Channel | Date | What changed |
|---|---|---|---|
| 1.0.3 | stable | October 31, 2026 | Signed and published. |
| 1.0.2 | stable | October 31, 2026 | Signed and published. |
| 1.0.1 | stable | October 31, 2026 | Signed and published. |
Licence and maker
The Data Design Group, Inc.. Licence: chosen by the maker (never GPL, LGPL or AGPL). Dependencies carry their own licences, listed on their pages.