Decibel Shield
Decibel chart › MRI scanner
How loud is a mri scanner?
A mri scanner measures about 120 dB, roughly as loud as a thunderclap. At 120 dB it is at or above the 85 dB line where hearing damage starts: NIOSH puts the safe limit at about 9 seconds a day. Normal conversation runs about 60 dB for comparison.
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| Decibel level | 120 dB |
|---|---|
| Hearing risk | Extreme risk — NIH notes sound intensity up to 120 dB in certain MR scanners, which is why ear protection is offered |
| Safe exposure (NIOSH) | About 9 seconds a day |
| Typical setting | work |
Figures sourced to NIH. See the full decibel levels chart for every source.
How a mri scanner compares
On the decibel scale, 120 dB sits above the 85 dB line where sustained exposure damages hearing. Sounds at a similar level:
- Thunderclap 120 dB
- Military jet at 100 m 120 dB
- Emergency siren 110–129 dB
- Pneumatic rock drill 115 dB
Everything at this level, with safe exposure times: how loud is 120 dB? →
How loud is a mri scanner?
A mri scanner measures about 120 dB, roughly as loud as a thunderclap. At 120 dB it is at or above the 85 dB line where hearing damage starts: NIOSH puts the safe limit at about 9 seconds a day. Normal conversation runs about 60 dB for comparison.
Is a mri scanner dangerous to hearing?
Yes — at 120 dB, a mri scanner is loud enough to damage hearing over time. NIOSH limits safe exposure to about 9 seconds a day; use hearing protection beyond that.
Measure it yourself
Decibel levels vary with distance and surroundings. Check the real level where you are with the free online decibel meter — no install, nothing recorded — or see the full decibel levels chart.