Noise Exposure Calculator
Estimate how much of a daily noise dose an exposure may use. Enter the sound level in decibels and the time exposed, then compare against NIOSH-style 85 dB / 3 dB exchange guidance or OSHA-style 90 dB / 5 dB guidance.
How the exposure estimate works
NIOSH-style guidance starts at 85 dB for 8 hours and halves time for every 3 dB increase. OSHA-style guidance starts at 90 dB for 8 hours and halves time for every 5 dB increase. This is educational guidance, not a certified workplace compliance measurement.
Frequently asked questions
How do you calculate noise exposure?
A common approach compares the time exposed to the recommended exposure limit at that decibel level. Higher decibels reduce recommended exposure time quickly.
What is the NIOSH 3 dB exchange rate?
NIOSH-style guidance starts at 85 dB for 8 hours and halves recommended exposure time for every 3 dB increase.
What is the OSHA 5 dB exchange rate?
OSHA-style guidance starts at 90 dB for 8 hours and halves permitted exposure time for every 5 dB increase.
Is this a medical or workplace compliance tool?
No. It is an educational calculator. For workplace compliance, use certified instruments and follow the rules that apply to your jurisdiction.
How do I measure the decibel level?
Use a sound level meter or the Measure Decibels iPhone app to estimate the dB level, then enter that value here.