RT60 Reverberation Calculator
Sabine-based reverberation time, calculated per frequency band, with a real materials database.
What it does
A Sabine-equation RT60 calculator with an editable absorption-coefficient database (14 common surface and treatment materials across 6 octave bands), Schroeder frequency check, and target-range comparison by use case.
Built for: Producers and small studio owners who want to estimate reverberation time before and after treatment.
Features
- Sabine RT60 calculation: RT60 = 0.161 x V / A
- Per-band calculation at 125/250/500/1000/2000/4000 Hz
- 14-material absorption coefficient reference table, fully editable
- Schroeder frequency + reliability warning for small rooms
- Target RT60 range by use case (mixing, mastering, vocal booth, podcast, general listening)
What's included
smt-rt60-calculator-v1.0-worksheet.xlsxsmt-rt60-calculator-v1.0-guide.pdfREADME.md
Compatibility
- Microsoft Excel (2016 or later) or Google Sheets
- Works on Windows, Mac, and in-browser via Google Sheets — no installation required
What this does not do
- Sabine's equation assumes fairly even absorption distribution — very live or very dead rooms are predicted less precisely by any Sabine-based calculator, including this one
- The 14-material absorption table is a reference starting point, not a guarantee — for a specific product, use its manufacturer-published coefficients
- Does not calculate speech intelligibility (STI) or other advanced room-acoustic metrics
Frequently asked questions
What's a 'good' RT60 for my room?
It depends on use — the calculator includes target ranges for mixing, mastering, vocal booth, podcast, and general listening, since a good reverb time for a vocal booth is very different from one for a living-room-style listening space.
Can I add my own materials?
Yes — the absorption coefficient table is a normal spreadsheet range, so you can edit or add rows using coefficients from a manufacturer's data sheet.
Why does it warn me about small rooms?
Sabine's equation gets less reliable in small, non-diffuse spaces below the Schroeder frequency — that's real acoustics, not a limitation specific to this calculator. The worksheet flags it so you don't over-trust the number.