Acoustic Index Reverberation Calculator
Free room-acoustics calculator with national targets such as DIN 18041 (German-language)
Free web calculator for reverberation time using the Sabine and Eyring formulas. Compares the result with targets from 26 standards in 15 countries (including DIN 18041), suggests absorbers from a product database with ISO 354 measurement data, and exports a PDF report. The interface is in German.
- Pricing
- free tier, contact the vendor
- Who it's for
- Interior architects, Acoustic planners
Why This Tool Exists
Checking whether a room meets an acoustic target means looking up the standard, summing surface absorption by hand and choosing products from datasheets.
Pick the room use and standard, enter dimensions, surfaces and furnishings, and the calculator shows reverberation time per octave band against the target and how much absorber area is missing. The page states results are guide values and do not replace acoustic design by a specialist.
How You Use It
Data Transparency
Exactly what this tool uses and how
Authenticated /v1/materials/* endpoints and public /public/* endpoints (documented at https://acousticindex.com/api)Use Cases
- ·Checking an office or classroom against DIN 18041
- ·Choosing absorbers to reach a reverberation target
- ·Sending room data to manufacturers for a product proposal
Pricing
Sources & Research NotesResearch date: 2026-10-19
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