| Source | Number | How it is measured |
|---|---|---|
| Life.Church (one large US church) | About 93-94 dBA average over 18 minutes of worship; quick peaks under 99-100 dBA. The same page also mentions a desired average of 91-92 dBA. | A-weighted, slow response (dBA-slow), monitored with Smaart |
| Behind The Mixer (a church sound engineer) | About 86 dBA at one church and 91 dBA at another. He also knows teams running around 104 dBA. | dBA, slow response |
| NIOSH (US workplace guidance) | 85 dBA averaged over an eight-hour workday; halve the time for every 3 dBA increase. | A workplace limit, not a church rule |
Behind The Mixer puts it plainly: "I won't recommend a specific volume level because it all depends on your room and the congregation." Life.Church says its numbers "fall within OSHA standards."
Using the NIOSH rule, the time at a level shrinks quickly as the level rises:
| Average level | Time at that level (NIOSH, 3 dBA rule) |
|---|---|
| 85 dBA | 8 hours |
| 88 dBA | 4 hours |
| 91 dBA | 2 hours |
| 94 dBA | 1 hour |
| 97 dBA | 30 minutes |
| 100 dBA | 15 minutes |
Calculated by us from the NIOSH recommended exposure limit of 85 dBA and the 3 dBA exchange rate. A worship set is shorter than a workday; this table only shows why teams watch the average of a whole set.
Life.Church is direct about this:
"There are several applications available on mobile devices to help visualize this average. These apps are typically not very accurate. If an attendee is attempting to monitor SPL using their phone, remember it is not a valid measurement tool."
Behind The Mixer adds that smartphone meters "are also often limited to 100 dB and rely on the phone's microphone."
Our own view, as the maker of a phone app: a phone should not replace a sound level meter. What a phone at the mixer can do is give you the same measurement every week after you calibrate it once against a real meter.
When someone says it was too loud, or too quiet, the strongest thing a team can show is what was measured each week, measured the same way. A weekly log of the level, the 15-minute average and the time over your church's limit gives that conversation a starting point.
Worship SPL: Church Volume is an iPhone app for this weekly log. Keep an iPhone at the mixer during the service: it logs one level per minute, the highest 15-minute average and the time over your church's limit, and shares a one-page PDF report with your pastor and sound team. Calibrate it once with a sound level meter to see dB(A). Free to download; logging and reports need a subscription with a 14-day free trial. Note that Worship SPL uses an energy average over 15 minutes, so the dBA-slow figures above are not limits you can copy directly.
