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Free Decibel Meter

90 Decibels — How Loud Is It?

Very loud

90 dB is about as loud as handheld power drill. 90 dB is OSHA's legal Permissible Exposure Limit (PEL) for an 8-hour workday — the US regulatory line, five decibels above NIOSH's stricter recommended limit. A handheld power drill or a motorcycle passing at 8 meters both reach roughly this level.

What does 90 dB sound like?

  • 90 dB — Handheld power drill
  • 88 dB — Motorcycle passing, 8 m away
  • 87 dB — Gas-powered lawn mower

Safe exposure time at 90 dB

Under NIOSH's Recommended Exposure Limit (85 dB, 3 dB exchange rate), safe unprotected exposure at 90 dB is about 2.5 hours per day. Under OSHA's legal Permissible Exposure Limit (90 dB, 5 dB exchange rate), it is about 8.0 hours per day.

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    Frequently asked questions

    What is the OSHA limit for 90 dB?
    OSHA's Permissible Exposure Limit (PEL) allows 8 hours of exposure at 90 dB(A), using a 5 dB exchange rate rather than NIOSH's stricter 3 dB rate.
    Is 90 dB louder than 85 dB?
    Yes — each 3 dB increase roughly doubles sound energy, so 90 dB carries roughly twice the acoustic energy of 87 dB, even though it sounds only modestly louder to the ear.

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