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Free Decibel Meter

140 Decibels — How Loud Is It?

Dangerous

140 dB is about as loud as firecracker. An unsuppressed firearm or a firecracker at close range both reach roughly 140 dB. At this level, hearing damage is caused by peak sound pressure, not duration — a single exposure lasting a fraction of a second can cause permanent damage.

What does 140 dB sound like?

  • 140 dB — Firecracker
  • 140 dB — Small firearm, unsuppressed, at the ear
  • 150 dB — Rock concert, peak level near the stage

Safe exposure time at 140 dB

Under NIOSH's Recommended Exposure Limit (85 dB, 3 dB exchange rate), safe unprotected exposure at 140 dB is about 1 second per day. Under OSHA's legal Permissible Exposure Limit (90 dB, 5 dB exchange rate), it is about 28 seconds per day.

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    Frequently asked questions

    Is 140 dB dangerous?
    Extremely. 140 dB is commonly associated with unsuppressed gunfire and firecrackers, and can cause instant, permanent hearing damage from a single exposure, per CDC noise data.
    Why are gunshots measured in dB if they're so brief?
    Peak sound pressure, not duration, is what causes acoustic trauma at these levels — even a fraction of a second at 140 dB or above can permanently damage the inner ear.

    Sources