An unsuppressed gunshot measures between 140 and 180 dB, depending on the caliber, host firearm, and conditions, well above the 140 dB peak sound pressure threshold NIOSH and OSHA set as the limit for unprotected exposure. A single shot above that threshold can cause permanent hearing damage. Common centerfire rifles and pistols measure 160-170 dB unsuppressed. A quality suppressor reduces peak sound by roughly 25-40 dB, which is enough to drop many configurations into the hearing-safe range. The full breakdown by caliber, distance effects, and what counts as "safe" is below.
Gunshot Decibels at a Glance
| Hearing-Damage Threshold | 140 dB (NIOSH/OSHA peak SPL) |
| Typical Unsuppressed Centerfire Rifle | 160-170 dB |
| Typical Unsuppressed Pistol | 155-165 dB |
| Typical Unsuppressed Shotgun | 155-165 dB |
| Typical Unsuppressed .22LR | 135-150 dB |
| Quality Suppressor Reduction | 25-40 dB peak SPL |
| Pneumatic Nail Gun (Reference) | 110 dB |
| Police Siren (Reference) | 120 dB |
| Distance Falloff | ~6 dB per doubling of distance (outdoors) |
Table of Contents
How Loud Is A Gunshot?
Loud enough that a single unprotected shot can cause permanent hearing damage. Unsuppressed gunfire registers in the 140-180 dB range at the shooter's position. For reference, a fighter jet at takeoff measures around 130 dB, and fireworks measure 150-170 dB. Most gunshots are louder than both.
Three things drive how loud a specific shot is: the cartridge (powder charge and bullet weight), the firearm (barrel length, action type, muzzle device), and the environment (indoor reflection vs outdoor dissipation). A .22 LR rifle outdoors with subsonic ammo is fairly quiet compared to other gunshots — around 140 dB. A .357 Magnum revolver indoors is the opposite extreme, regularly measuring 170+ dB at the shooter's ear.
Loudest Common Firearms (Unsuppressed)
• .357 Magnum revolver — approximately 169 dB
• .308 Winchester hunting rifle — approximately 167 dB
• 5.56 NATO / .223 Rem AR-15 (16" barrel) — approximately 165 dB
• 9mm full-size pistol — approximately 162 dB
• 12-gauge shotgun — approximately 161 dB
• .22 LR pistol — approximately 157 dB
• .22 LR rifle with subsonic ammunition — approximately 140 dB
These figures are industry-standard averages drawn from NIOSH-funded research, manufacturer testing, and peer-reviewed firearms-acoustics studies. Actual measurements vary by host, barrel length, ammunition, and measurement equipment, but the rank order and rough magnitudes are consistent across sources.
How Many Decibels Is A Gunshot?
Most centerfire gunshots measure 160-168 dB at the shooter's position. Magnum revolvers and large-bore rifles push the upper end of that range to 170+ dB. Rimfire and subsonic loads can drop the unsuppressed measurement under 150 dB. Every one of those numbers exceeds the 140 dB NIOSH threshold for hearing-safe single-exposure peak SPL.
Unsuppressed Gunshot Decibels by Caliber |
|
|
Firearm |
Approximate dB (unsuppressed) |
| .357 Magnum Revolver | ~169 dB |
| .308 Winchester Hunting Rifle | ~167 dB |
| 5.56 NATO / .223 Rem AR-15 (16" barrel) | ~165 dB |
| 9mm Pistol (e.g., Glock 17) | ~162 dB |
| 12-gauge Shotgun | ~161 dB |
| .22LR Pistol | ~157 dB |
| .22LR Rifle with subsonic ammo (e.g., CCI Standard Velocity) | ~140 dB |
Source: Industry-standard figures consistent with NIOSH firearms-acoustics research, OSHA occupational noise references, and peer-reviewed measurement studies. Individual measurements vary based on barrel length, ammunition, environment, and equipment.
What Does a Suppressor Sound Like?
A quality suppressor reduces peak sound by roughly 25-40 dB. That's similar to the noise reduction rating (NRR) of the best over-ear hearing protection (NRR 25-33 dB). Many suppressed configurations drop below the 140 dB hearing-damage threshold, particularly on pistol calibers, rimfire, and suppressed subsonic rifle loads.
Suppressed shots also change character, not just volume. The sharp "crack" of an unsuppressed shot becomes a duller "thud." Indoor shooting feels less concussive because the muzzle blast is captured before it can reflect off walls. Outdoor shooting becomes pleasant enough that you can have a conversation between shots.
Typical Suppressed Gunshot Decibels by Caliber |
|
|
Firearm |
Approximate dB (suppressed with quality silencer) |
| .308 Winchester Hunting Rifle | ~130-138 dB |
| 5.56 NATO / .223 Rem AR-15 (16" barrel) | ~131-140 dB |
| 9mm Pistol | ~120-128 dB |
| .22LR Pistol | ~115-125 dB |
| .22LR Rifle (subsonic) | ~108-118 dB |
These are industry-typical ranges for suppressed shooting. Specific suppressor models, host configurations, and ammunition choices change the result. The exact decibel level your specific setup produces depends on the suppressor design, the host firearm, the ammunition you use, and the environment you're shooting in. Suppressed subsonic shooting on a quality rimfire or pistol platform is the quietest realistic combination — closer to a pneumatic nail gun than a traditional gunshot.
What Gunshots Sound Like Compared to Everyday Noise
Putting gunshot dB on the same chart as everyday noise sources shows just how far outside ordinary acoustic range firearms operate:
| Sound Source | Approximate dB |
| Unsuppressed centerfire gunshot | ~160-170 dB |
| Thunder (very close) | ~165-180 dB |
| Fireworks (close) | ~150-170 dB |
| Jet Engine (100 ft away) | ~160 dB |
| Suppressed Gunshot (typical) | ~125-140 dB |
| Police Siren (close) | ~120 dB |
| Pneumatic Nail Gun | ~110 dB |
| Lawn Mower / Motorcycle | ~100 dB |
| Heavy Traffic / Vacuum Cleaner | ~70-80 dB |
| Normal Conversation | ~60 dB |
Every 10 dB increase represents roughly double the perceived loudness. A 160 dB gunshot is perceived as more than 1,000 times louder than normal conversation — and the OSHA-permitted exposure time at 115 dB (an extremely loud rock concert) is just 15 minutes. There is no safe exposure time at 160 dB without hearing protection.
How Distance Affects Gunshot Volume
Sound pressure follows the inverse square law: roughly a 6 dB drop for every doubling of distance from the muzzle (outdoors, with no significant reflection). That means:
• 10 feet from the shooter: peak SPL is roughly the same as at the muzzle.
• 20 feet: down about 6 dB.
• 40 feet: down about 12 dB.
• 80 feet: down about 18 dB.
• 160 feet: down about 24 dB — but still potentially above the 140 dB threshold for the loudest cartridges.
Indoor shooting reads significantly louder than outdoor shooting at the same distance because indoor surfaces reflect the sound rather than letting it dissipate. A shot fired indoors can measure 5-10 dB higher at the ear than the same shot fired outdoors.
Indoor vs Outdoor Gunshot Acoustics
The same shot measures differently depending on where you fire it. Indoor ranges trap and reflect sound off walls, ceilings, and floors. The result is amplified peak SPL at the shooter's ear — typically 5-10 dB louder than the same shot outdoors. This is why suppressors matter even more indoors: the suppressor reduces both the muzzle blast and the energy that would otherwise bounce around the structure.
Outdoor shooting on an open range or in the field gives sound room to dissipate. Outdoors, distance falloff is roughly 6 dB per doubling. Indoors, reflection can mean the sound stays near the source intensity throughout the structure, regardless of where you stand. For indoor training environments, hearing protection plus a suppressor is the only acoustically responsible configuration.
Frequently Asked Questions
How many decibels is a gunshot?
Typical unsuppressed gunfire measures 140-180 dB at the shooter's position. Most centerfire rifles and pistols fall in the 160-170 dB range. The exact figure depends on the caliber, barrel length, ammunition, and environment. With a quality suppressor, peak SPL drops 25-40 dB, and many configurations fall under the 140 dB NIOSH threshold for hearing-safe single-exposure.
How loud is a 9mm gunshot?
A 9mm pistol fired unsuppressed measures approximately 160-165 dB at the shooter's position. With a quality 9mm suppressor, the same shot typically drops to 120-128 dB — quieter than a police siren and below the 140 dB hearing-damage threshold.
What are the loudest guns?
Magnum revolvers and centerfire rifles top the list. .357 Magnum revolvers measure approximately 169 dB, .308 hunting rifles approximately 167 dB, and 5.56/.223 AR-15 carbines approximately 165 dB unsuppressed. The very loudest commonly available firearm is the .50 BMG, which can reach 180 dB. Suppressors reduce all of these significantly, but the loudest cartridges generally remain audible even when suppressed.
What does a suppressor actually sound like?
A duller, less concussive report than the original shot. The sharp "crack" is gone, replaced by a "thud." Subsonic ammunition on rimfire or pistol hosts produces something genuinely close to a pneumatic nail gun. Centerfire rifle hosts with supersonic loads remain audible due to the sonic crack downrange, but the muzzle blast is dramatically reduced.
Is the 140 dB threshold a hard line?
Yes — NIOSH and OSHA both treat 140 dB peak SPL as the maximum unprotected exposure limit, and research shows audiological damage can occur from a single exposure above that threshold. The threshold isn't a gradual zone; below 140 dB, peak SPL is considered hearing-safe for intermittent exposure, and above it, damage risk is real and immediate.
Do gunshot decibels change indoors vs outdoors?
Yes. Indoor environments reflect sound off walls, floors, and ceilings, increasing perceived loudness by 5-10 dB at the shooter's ear compared to the same shot fired outdoors. Outdoor shooting allows sound to dissipate roughly 6 dB per doubling of distance — indoor shooting doesn't get that benefit until you exit the structure.
Does a suppressor make shooting hearing-safe?
In many configurations, yes. A quality suppressor reduces peak SPL by 25-40 dB, which can drop many suppressed setups below the 140 dB threshold — particularly rimfire, pistol calibers, and subsonic rifle loads. Supersonic centerfire rifle loads remain above 140 dB at the muzzle even with a suppressor, because the sonic crack downrange contributes peak energy the suppressor doesn't address. For the quietest possible setup, pair a quality suppressor with subsonic ammo.
Is “movie-quiet” realistic?
Not with most centerfire ammunition. The sonic crack from supersonic bullets remains even when the muzzle blast is suppressed, which is why subsonic loads are required for the quietest setups. The only configurations that approach "movie-quiet" are suppressed subsonic rimfire (closest to a pneumatic nail gun) and suppressed .45 ACP (naturally subsonic by design).
Does distance reduce the decibels of a gunshot?
Yes — approximately 6 dB per doubling of outdoor distance from the muzzle. That means at 80 feet, a shot is roughly 18 dB quieter than at the muzzle. Indoor environments alter this significantly because reflection slows the dissipation. Terrain features (trees, hills) also absorb and scatter sound.
What hearing protection ratings match a suppressor?
The best commercially available over-ear hearing protection has a Noise Reduction Rating (NRR) of 25-33 dB. A quality suppressor provides 25-40 dB of reduction at the muzzle. Doubled-up hearing protection (foam plugs + over-ear muffs) provides about 8 dB additional reduction beyond either alone. The best peak-SPL configuration for hearing safety is suppressor + double ear protection.
Bottom Line
Gunshots are loud — loud enough that a single unprotected shot can cause permanent hearing damage. NIOSH and OSHA both set 140 dB as the maximum peak SPL for unprotected exposure, and almost every common firearm exceeds that threshold unsuppressed. A quality suppressor reduces peak SPL by 25-40 dB, which is enough to bring many setups into the hearing-safe range. Combined with hearing protection, a suppressor is the most effective acoustic upgrade available to shooters. Protect your hearing — it doesn't come back.
