How Loud Is a Concert or Festival?

Concerts are unusual among loud sounds: instead of vague estimates, there is real regulation with real numbers. Reading them side by side is more useful than any single figure, because they disagree in instructive ways.

The WHO's 2022 Global standard for safe listening venues and events sets a maximum of 100 dB LAeq averaged over 15 minutes, recommends 90–94 dB LAeq as safer practice, and requires quiet zones below 70 dB. The Swiss Sound and Laser Ordinance permits 93 dB(A) as standard, up to 100 dB(A) with maximum-level monitoring and audience notification, and requires compliance at any point accessible to the public. Flanders sets three categories, up to 100 dB LAeq over 60 minutes or 102 dB LAeq over 15 minutes with a maximum-level cap.

The WHO's supporting documentation for the standard reports that roughly a third of monitored concerts exceeded the 100 dB LAeq 15-minute limit at the front-of-house mixing position. That is the most informative single statistic on this page: the ceiling is not comfortably above typical practice, it is inside it.

The WHO material also documents a Belgian nightclub case where the mid-venue level rose from 99.5 dB to 103.4 dB and then to 107.5 dB LAeq (over roughly three minutes) as additional speaker zones were switched on — the same room, the same night, an 8 dB swing from a system configuration change.

Compliance measurements are usually taken at or near the mixing desk, which is deliberately a representative audience position. It is not the loudest one. Directly in front of a speaker stack, the level is higher; at the back of a large room, lower.

This is why Switzerland's requirement — compliance at any point accessible to the public — is a materially stricter standard than a single-position measurement, and why an app reading you take from wherever you happen to be standing is not comparable to a regulatory figure.

An equivalent continuous level (LAeq) averages sound energy over a window. Because decibels are logarithmic, a short loud passage contributes far more energy than its duration suggests — so the same music can pass a 60-minute limit and fail a 15-minute one.

That is exactly why Flanders' category 3 pairs 100 dB over 60 minutes with 102 dB over 15 minutes: the two are calibrated to allow similar programmes while catching different failure modes. Any concert figure quoted without its averaging window is incomplete.

Maximum-level caps address a different risk again. Switzerland's 125 dB(A) ceiling on maximum level exists because an average can be compliant while individual moments are not.

The WHO standard exists because entertainment noise is one of the largest preventable causes of hearing loss, and its structure — a ceiling, a safer-practice recommendation, quiet zones, and audience information — reflects that no single number does the job.

For reference: NIOSH's recommended occupational limit is 85 dBA over 8 hours with a 3 dB exchange rate. At the WHO ceiling of 100 dB, the same arithmetic allows a small fraction of that time. That comparison is educational, not a personal exposure calculation — a concert is not an 8-hour workday, and we do not compute a personal safe duration from any reading.

This is the hardest case for consumer hardware. Concert levels sit near or above the point where phone and laptop microphone chains compress and clip, and the automatic gain control in a browser audio path can actively work against you — which is why our meter disables it where the browser allows.

Uncalibrated, our meter reports A-weighted digital signal level in dBFS: a relative figure that cannot be compared with a 100 dB LAeq limit. Calibrated once against a trusted meter, it reports an estimated dBA figure — still an estimate, taken at your position rather than a compliance position, and not evidence of whether a venue complies with anything.