How loud is 136 decibels?

136 dB (written 136db, 136 dBA or 136 decibels) is in the range of a jet engine at takeoff, twenty-five metres (140 dBA). Because every 10 decibel rise sounds roughly twice as loud, 136 dB sounds about 194 times as loud as normal conversation at 60 dB. Real levels vary with distance: doubling your distance from a source lowers the level by about 6 dB.

Is 136 decibels dangerous?

136 dBA is above the 85 decibel level at which the NIOSH recommended exposure limit begins. At this level NIOSH allows about less than 1 second before the daily exposure is used up, so hearing protection is worth wearing for anything longer than that.

What does 136 dB sound like?

A 136 dB sound is in the range of a jet engine at takeoff, twenty-five metres (140 dBA). It is loud enough that you would need to raise your voice to be heard at arm's length, and it is uncomfortable within seconds without protection. The everyday sounds table above lists sources measured near this level.

How many decibels is safe?

For hearing conservation, 85 dBA averaged over an eight hour day is the NIOSH recommended exposure limit, and every 3 decibel increase above it halves the time allowed. The US EPA identified 70 dB averaged over 24 hours as the level that protects against measurable hearing effects over a lifetime. Below about 70 dB the number matters for comfort and speech, not for hearing damage.

Why do NIOSH and OSHA give different answers?

They use different reference levels and different exchange rates. NIOSH recommends 85 dBA over eight hours with a 3 decibel exchange rate, which halves the time for every 3 decibel rise. OSHA enforces 90 dBA with a 5 decibel exchange rate. The OSHA limit is the legally enforceable one in United States workplaces; the NIOSH figure is the more protective recommendation.

What is an exchange rate?

It is the increase in level that halves the permissible exposure time. With the NIOSH 3 decibel exchange rate, 85 dBA allows 8 hours, 88 allows 4, 91 allows 2 and 94 allows 1. With the OSHA 5 decibel rate the same progression takes 5 decibels per halving, which is why OSHA permits considerably longer at any level above its reference.

Does hearing protection subtract its rating from the noise?

Not in practice. A noise reduction rating comes from a laboratory fit, and real world reduction is reliably lower, sometimes by half. Fit is what determines actual protection: a muff worn over glasses arms or long hair loses several decibels, and an earplug that is not sealed provides very little. Consistent wearing matters more than the number on the box.

How do I measure the level where I am?

A handheld sound level meter costs very little and gives a figure with a stated range and accuracy. A phone app is useful for deciding whether a space is obviously loud, but phone microphones are not calibrated and the reading should not be treated as a measurement. For workplace assessment the figure that matters is a time weighted average across the shift rather than a peak.

136 decibels: how loud it is and how long is safe

Quick answer

136 dB is in the range of a jet engine at takeoff, twenty-five metres (140 dBA), roughly 194 times as loud as normal conversation. At 136 dBA the NIOSH recommended exposure limit allows less than 1 second a day, while the separate OSHA enforceable limit allows 49 seconds.

How long is 136 decibels safe for?

Two different limits are quoted in the United States and they give very different answers. NIOSH recommends 85 dBA as an eight hour time weighted average with a 3 decibel exchange rate, meaning every 3 decibel increase halves the permissible time. OSHA enforces 90 dBA over eight hours with a 5 decibel exchange rate, which permits substantially longer at any given level.

NIOSH is a recommendation based on hearing conservation research. OSHA is the enforceable workplace rule. Quoting one as though it were the other is a common and consequential error.

Published figure From a named standards body, regulator or professional classification. Reproduced here, not derived by us.

NIOSH allows less than 1 second at 136 dBA; OSHA allows 49 seconds.

Permissible exposure at 136 dBA
Standard	Status	Reference	Exchange rate	Time at 136 dBA
NIOSH recommended exposure limit	Recommendation	85 dBA / 8 h	3 dB	less than 1 second
OSHA permissible exposure limit	Enforceable	90 dBA / 8 h	5 dB	49 seconds

Both figures are time weighted averages across a working day rather than limits on a single moment. Exposure at several levels through a day combines, so a short burst at a high level uses up a large share of the daily allowance.

Where this level shows up

Around 136 decibels is about the level of a jet engine at takeoff, twenty-five metres. Levels near this one are listed below, which is usually more useful than the number on its own.

Published figure From a named standards body, regulator or professional classification. Reproduced here, not derived by us.

Sounds within a few decibels of 136 dBA.

Everyday sounds near 136 dBA
Sound	Typical level (dBA)
A jet engine at takeoff, twenty-five metres	140

Typical A-weighted levels at a usual listening distance. Real levels vary with distance, enclosure and the specific equipment.

The NIOSH ladder in full

Published figure From a named standards body, regulator or professional classification. Reproduced here, not derived by us.

Every 3 decibel increase halves the NIOSH permissible time, from 8 hours at 85 dBA down to about 1 second at 130 dBA.

Permissible exposure time at every level
Level (dBA)	NIOSH allows	OSHA allows
85	8 hours	16 hours
88	4 hours	10.6 hours
91	2 hours	7 hours
94	1 hour	4.6 hours
97	30 minutes	3 hours
100	15 minutes	2 hours
103	7.5 minutes	1.3 hours
106	3.8 minutes	52.2 minutes
109	1.9 minutes	34.5 minutes
112	56 seconds	22.7 minutes
115	28 seconds	15 minutes
118	14 seconds	9.9 minutes
121	7 seconds	6.5 minutes
124	4 seconds	4.3 minutes
127	2 seconds	2.8 minutes
130	1 second	1.9 minutes

Above roughly 140 decibels the relevant guidance concerns impulse noise and immediate damage rather than a duration, so no time is given there.

Sources

NIOSH, Criteria for a Recommended Standard: Occupational Noise Exposure, Revised Criteria 1998 (DHHS NIOSH Publication No. 98-126): 85 dBA over 8 hours, 3 dB exchange rate.
OSHA, 29 CFR 1910.95 Occupational Noise Exposure, Table G-16: 90 dBA over 8 hours, 5 dB exchange rate.
Typical sound levels are representative figures from hearing conservation references at a usual listening distance, not measurements of a specific device.

Researched reference information, not medical or professional advice.

Common questions

How loud is 136 decibels?: 136 dB (written 136db, 136 dBA or 136 decibels) is in the range of a jet engine at takeoff, twenty-five metres (140 dBA). Because every 10 decibel rise sounds roughly twice as loud, 136 dB sounds about 194 times as loud as normal conversation at 60 dB. Real levels vary with distance: doubling your distance from a source lowers the level by about 6 dB.
Is 136 decibels dangerous?: 136 dBA is above the 85 decibel level at which the NIOSH recommended exposure limit begins. At this level NIOSH allows about less than 1 second before the daily exposure is used up, so hearing protection is worth wearing for anything longer than that.
What does 136 dB sound like?: A 136 dB sound is in the range of a jet engine at takeoff, twenty-five metres (140 dBA). It is loud enough that you would need to raise your voice to be heard at arm's length, and it is uncomfortable within seconds without protection. The everyday sounds table above lists sources measured near this level.
How many decibels is safe?: For hearing conservation, 85 dBA averaged over an eight hour day is the NIOSH recommended exposure limit, and every 3 decibel increase above it halves the time allowed. The US EPA identified 70 dB averaged over 24 hours as the level that protects against measurable hearing effects over a lifetime. Below about 70 dB the number matters for comfort and speech, not for hearing damage.
Why do NIOSH and OSHA give different answers?: They use different reference levels and different exchange rates. NIOSH recommends 85 dBA over eight hours with a 3 decibel exchange rate, which halves the time for every 3 decibel rise. OSHA enforces 90 dBA with a 5 decibel exchange rate. The OSHA limit is the legally enforceable one in United States workplaces; the NIOSH figure is the more protective recommendation.
What is an exchange rate?: It is the increase in level that halves the permissible exposure time. With the NIOSH 3 decibel exchange rate, 85 dBA allows 8 hours, 88 allows 4, 91 allows 2 and 94 allows 1. With the OSHA 5 decibel rate the same progression takes 5 decibels per halving, which is why OSHA permits considerably longer at any level above its reference.
Does hearing protection subtract its rating from the noise?: Not in practice. A noise reduction rating comes from a laboratory fit, and real world reduction is reliably lower, sometimes by half. Fit is what determines actual protection: a muff worn over glasses arms or long hair loses several decibels, and an earplug that is not sealed provides very little. Consistent wearing matters more than the number on the box.
How do I measure the level where I am?: A handheld sound level meter costs very little and gives a figure with a stated range and accuracy. A phone app is useful for deciding whether a space is obviously loud, but phone microphones are not calibrated and the reading should not be treated as a measurement. For workplace assessment the figure that matters is a time weighted average across the shift rather than a peak.

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Last updated 2026-10-07.