How Loud Is Too Loud? Decibel Safety Calculator

Multi-row daily noise dose

Add the main noise exposures in one day. The combined dose uses the selected exposure standard above. Weekly dose is a planning estimate: daily dose multiplied by noisy days per week.

Common sounds and recommended time

Ranges vary by source, distance, room, measurement method, and device. The recommended time column updates for the selected standard where a steady dBA estimate is useful; impulse noise needs extra caution.

Hearing exposure formulas

For safety screening, the calculator compares your exposure time with a reference duration for the selected standard. With a 3 dB exchange rate, every 3 dB increase roughly doubles sound energy and halves the recommended time.

NIOSH recommended time:
T = 8 hours * 2^((85 - L) / 3)

OSHA Appendix A reference duration:
T = 8 hours * 2^((90 - L) / 5)

Single exposure dose:
dose percent = 100 * C / T

Combined daily dose:
total dose percent = sum(100 * Cn / Tn)

Advanced acoustic conversions are still available above. Decibels are logarithmic: I = I0 * 10^(L/10) and p = p0 * 10^(L/20), using I0 = 1e-12 W/m² and p0 = 20 microPa.

Hearing safety

• Loudness and time both matter. Repeated exposures add up across a day.
• Quick check: if you have to raise your voice to talk to someone 1 m away, it’s probably too loud for long stays.
• Increase distance. In open air, doubling distance often lowers level by roughly 6 dB.
• Protect your ears. Use earplugs or earmuffs at loud events or around power tools; take listening breaks.
• Do not wait for pain. Ringing, muffled hearing, or discomfort are warning signs, but damaging exposure can happen before pain.

This tool is educational and not a calibrated sound-level meter, medical advice, or legal compliance advice. Follow your local rules and a qualified professional for workplace or medical decisions.

Sources and assumptions

Last reviewed: June 29, 2026. This page assumes steady A-weighted levels, approximate duration, and good-faith input values. Real risk varies with individual susceptibility, impulse noise, fit of protection, measurement accuracy, and local regulation.

Decibel safety FAQ

What dB level is too loud?

About 70 dBA or below is generally unlikely to cause hearing loss after long exposure. Long or repeated exposure at or above 85 dBA can be harmful, and louder sounds need shorter exposure times.

How long is 85 dB safe?

NIOSH uses 85 dBA for 8 hours as a recommended exposure limit. OSHA workplace rules use a less protective 5 dB exchange table, so choose the mode that fits your purpose.

How long can you listen at 90, 95, 100, and 110 dB?

Using NIOSH: about 2.5 hours at 90 dBA, 48 minutes at 95 dBA, 15 minutes at 100 dBA, and under 2 minutes at 110 dBA.

Is 70 dB safe all day?

For hearing loss risk, 70 dBA or below is generally treated as unlikely to cause hearing loss even after long exposure. Other effects such as sleep or annoyance can still matter.

What is the difference between dB, dBA, and dB SPL?

dB is a logarithmic ratio. dB SPL is sound pressure level relative to 20 microPa. dBA is A-weighted sound level, which is the usual unit for hearing-exposure guidance.

Can a phone measure decibels accurately?

A phone app can be useful for screening, but accuracy depends on hardware, calibration, wind, the phone case, and the app. Use a calibrated sound level meter for compliance or high-stakes decisions.

Do earplugs reduce the dose?

Yes, if they fit well and are worn consistently. The calculator estimates protected level conservatively, but real-world protection can be much lower than the label rating.

Is pain a reliable warning sign?

No. Noise can damage hearing before it hurts. Ringing, muffled hearing, or needing to raise your voice are warning signs, but absence of pain does not prove safety.

Why do distance and time matter?

Time determines dose. Distance often lowers level; in open air, doubling distance can reduce sound by roughly 6 dB, though rooms and reflections change the result.