Church Acoustics Calculator

Church sanctuaries face a genuine acoustic tension that most rooms don't: spoken word wants a short, dry reverberation time for intelligibility, while organ and choral music wants a long, rich one for warmth and blend, and a single room has to serve both. This calculator resolves that tension by target RT60 based on your declared worship style — 2.5 seconds for liturgical/organ-centered services where reverberant bloom is the point, 1.5 seconds for a blended service, and 0.8 seconds for contemporary worship where amplified speech and modern instruments need clarity more than reverb. Using the Sabine equation, it compares your current measured or estimated RT60 against that target, computes the absorption difference in sabins, and — if the room needs to get drier — converts that into a recommended area of NRC-0.8 acoustic panels (rooms that are already too dry for their style aren't given a panel number, since removing absorption isn't a simple panel calculation).

Two secondary indices, speech clarity and musical warmth, are derived directly from the current RT60 on a 1–3 scale to make the trade-off visible: a room with excellent speech clarity (RT60 ≤ 1.0s) will score poorly on musical warmth, and vice versa, illustrating why compromise or variable acoustic treatment (retractable banners, adjustable panels) is often the real solution rather than a single fixed target. Volume per seat is also reported against a healthy range of roughly 150–300 cubic feet per person. As with any Sabine-based estimate, treat the panel area as a starting point — pew upholstery, carpet, and congregation size all shift absorption in ways a single coefficient can't fully capture, so verify with an on-site RT60 measurement before finalizing large treatment purchases.