How Loud Is a Gunshot? — Decibel Levels by Firearm Type

At 140–175 dB, gunshot falls within a well-studied range of the decibel scale. Acoustic engineers, occupational health researchers, and environmental scientists have extensively characterized sounds in this range, providing robust data on health effects, safe exposure durations, and effective mitigation strategies.

Noise at 140–175 dB from gunshot exceeds the maximum level that any regulatory body considers safe for unlimited exposure. At this intensity, sound energy is sufficient to physically damage the stereocilia (hair-like structures) on inner ear sensory cells. These structures do not regenerate in mammals — every exposure above safe limits contributes to permanent, cumulative hearing loss.

Room acoustics have a major impact on how loud gunshot actually sounds. Hard, reflective surfaces (tile, glass, concrete) create reverberation that can increase the effective level by 5–10 dB. Soft materials like curtains, carpet, and upholstered furniture absorb sound waves and make the same source noticeably quieter.

The decibel scale is logarithmic — each 10 dB increase represents a tenfold jump in sound energy and roughly a doubling of perceived loudness. At 140–175 dB, gunshot carries 6,309,573,444,801,943× more acoustic energy than the threshold of hearing (0 dB), placing it in a well-characterized region of the audible spectrum.

According to NIOSH guidelines, the maximum safe exposure time at 175 dB is Immediate risk. This level can cause instant pain and hearing damage.

Because gunshot reaches 175 dB, hearing protection during exposure is not optional — it's a medical necessity. The type and level of protection depends on your exposure pattern: occasional home users can rely on disposable foam earplugs (NRR 29–33), while daily professional users should invest in custom-molded earplugs or electronic earmuffs.

The most effective noise reduction combines source treatment, path interruption, and receiver protection — the "source-path-receiver" model used by acoustic engineers. For gunshot at 175 dB, start at the source (can you reduce the noise output?), then address the path (can you add distance, barriers, or absorption?), and finally protect yourself (hearing protection, time limits).

To measure gunshot noise accurately, use a calibrated smartphone app (NIOSH SLM, Decibel X, or our own Snap Decibel Meter) or a dedicated Type 2 sound level meter. Position the device at 1 meter from the source, at the height where you'd normally hear it. Take readings over 30–60 seconds and note both average (Leq) and peak (Lmax) values.

Measuring loud sounds like gunshot at 158 dB requires caution — the measurement process itself exposes you to potentially damaging noise. Wear hearing protection during measurement sessions, use a remote microphone or tripod placement when possible, and limit measurement duration to the minimum needed for representative data.

The progression of hearing damage from gunshot exposure follows a predictable pattern: first, temporary threshold shift (sounds seem muffled after exposure), then persistent tinnitus (ringing or buzzing that doesn't resolve), then permanent threshold shift (measurable hearing loss on audiometric testing). Early-stage damage is often unnoticed because the brain compensates by "filling in" missing signals from context.

Warning signs of overexposure to gunshot noise include: ringing, buzzing, or hissing in the ears after exposure; speech sounding muffled or distant; difficulty following conversations in restaurants or social settings; and needing to gradually increase TV or headphone volume. If you experience any of these after exposure to gunshot, reduce future exposure immediately and consult an audiologist.