Decibel Equivalent Tables
 Normal Range (40 to 85 dB)
 Dangerous Range (85 to 115 dB)
 Serious Injury Range (115 dB to 140 dB)
 Deadly Range (140 dB to 200 dB)
 Extreme Range (more than 200 dB)
Noise Source  Decibel Level 

Conversation in restaurant, office, background music, Air conditioning unit at 100 ft  60 
Quiet suburb, conversation at home. Large electrical transformers at 100 ft  50 
Library, bird calls (44 dB); lowest limit of urban ambient sound  40 
Quiet rural area  30 
What is the acceptable level of Decibel?
Normal conversation: 60 dB; Traffic: 80 dB; Industrial noise: 100 dB; Nearby thunder: 120 dB; Jet engine: 140 dB; Sounds louder than 130 dB can cause acute hearing loss. The list below outlines different decibel levels… A hearing loss of up to 20 decibels under the hearing threshold is still considered a normal hearing.
What dB level is considered safe?
 10dB: Normal breathing
 20dB: Leaves rustling in a tree
 30dB: Whispering nearby
 40dB: A babbling brook, birds chirping
 50dB: Refrigerator humming, office environment
 60dB: Normal conversation noise
 6070dB: Hairdryer
 70dB: Washing machine, TV, driving in traffic
 75dB: Flushing toilet
 7080dB: Coffee grinder
How many decibels is dangerous?
Dangerous decibel levels. 85dB is the threshold level at which your hearing can become damaged over time. Sounds under 85dB are safe to listen to – you don’t need to use any hearing protection. But if you work in a noisy environment and the sound levels reach 80dB, your employer should assess the risk to your hearing and give you …
What is dangerous decibel level?
Dangerous and Safe Noise Levels. The noise chart below lists average decibel levels for everyday sounds around you. Painful impulse noise—Not safe for any period of time. 150 dBP = fireworks at 3 feet, firecracker, shotgun. 140 dBP = firearms. Painful steady noise—Not safe for any period of time. 130 dBA = jackhammer
What does 70 decibels sound like?
70 decibels is as loud as a washing machine or a dishwasher. It is a moderate noise level. 70 dB noise is not considered harmful to human hearing. However, extended exposure to levels above 5560 dB can be considered disturbing or become annoying.
What is the equivalent of 30 dB?
Whispering30 dB: Whispering nearby. 40 dB: Quiet library sounds. 50 dB: Refrigerator. 60 dB: Electric toothbrush.
What is the equivalent of 40 dB?
Decibels ExplainedDecibel LevelSource10 dBNormal breathing20 dBRustling leaves, mosquito30 dBWhisper40 dBStream, refrigerator humming7 more rows
How loud is 60 to 70 decibels?
Common Sources of Noise and Decibel Levels Sound is measured in decibels (dB). A whisper is about 30 dB, normal conversation is about 60 dB, and a motorcycle engine running is about 95 dB. Noise above 70 dB over a prolonged period of time may start to damage your hearing.
How loud is a gunshot in dB?
Almost all firearms create noise that is over the 140dB level. A small . 22caliber rifle can produce noise around 140 dB, while bigbore rifles and pistols can produce sound over 175 dB.
How loud is a nuclear bomb?
A nuclear bomb. Decibel meters set 250 feet away from test sites peaked at 210 decibels. The sound alone is enough to kill a human being, so if the bomb doesn’t kill you, the noise will. Fun fact!
How loud is 55 decibels example?
Sound Clip Decibel LevelsSoundTypeDecibels (dBA)Electric toothbrushSpecific55Coffee percolatorSpecific55Normal conversationSpecific60Sewing machineSpecific6080 more rows•Nov 1, 2017
How many dB is a train horn?
The maximum volume level for the train horn is 110 decibels which is a new requirement. The minimum sound level remains 96 decibels.
What does 50 dB sound like?
50 dB is as loud as a quiet conversation, a quiet suburb, a quiet office, or a quiet refrigerator. Notice the use of the word ‘quiet’ when describing this noise level? That’s because all sounds between 3160 decibels are considered quiet.
Is 80 dB twice as loud as 70 dB?
Loudness is measured in decibels (dB). As decibels rise, loudness quickly increases. A 10dB rise is a 10time leap in loudness. That means an 80dB sound (a vacuum cleaner) is 10 times louder than a 70dB sound (a telephone ringing) and 100 times louder than a 60dB sound (normal conversation).
How many decibels is a refrigerator?
32 – 47 decibelsMost fridges have a range of 32 – 47 decibels.
How loud is a car horn?
Sound levels of typical car horns are approximately 107–109 decibels, and they typically draw 5–6 amperes of current.
How do you convert dB to normal value?
0:443:53conversion from db scale to normal scale/conversion from … – YouTubeYouTubeStart of suggested clipEnd of suggested clipSo i will just write 10 log 10 equal to 3 and after that i need to write. This 10 i have to take toMoreSo i will just write 10 log 10 equal to 3 and after that i need to write. This 10 i have to take to the right hand side here. And this 10 will be going as a denominator. Here.
How many dB is a watt?
A watt of electrical power is the use of one joule of energy per second….WattsdB (rel to 1 watt)1023.0102999656.9897101011 more rows•Aug 30, 2004
Is 50 dB loud for a fan?
50 dBA is LOUD. 40 dBA is a normal office noise level. 50 dBA of constant noise will induce fatigue. You will be quick to notice that using more than one fan, each smaller but each running at slower speeds results in a much quieter, lessmaddening experience.
How many decibels is a vacuum cleaner?
The sound pressure level of working vacuum cleaners varies from 65 dB (A) to 90 dB (A).
How Decibel Levels Are Measured
To measure the noise level of different sounds, we use a measurement unit called the decibel (dB). It represents a sound’s intensity. To measure a sound’s frequency, we use the hertz (Hz).
Decibel Level Chart of Common Sounds
The intensity of common sounds ranges from 0 dB to 140 dB. Looking at a decibel chart such as the one below, we can determine if those sounds are safe, potentially harmful, or outright dangerous for our ears.
Noise Level Chart and Maximum Exposure Time
The amount of time you are exposed to a certain decibel level will determine the potential of hearing damage or loss. While you can safely be exposed to some levels for a few hours, other levels can cause pain or even hearing loss if you are exposed to them for even one minute.
Tips to Prevent Damage to Your Hearing
Here are a few simple tips to prevent damage to your hearing you can apply if you find yourself in a situation where you are exposed to loud noises:
Measure the Sound Level Around You With Decibel Pro App
The easiest way to check the decibel readings of common sounds is to use a professional app like Decibel Pro. Using it, you can measure the sound levels around you and take measures to protect your hearing if necessary.
How many times is a decibel?
The number of decibels is ten times the number of bels (equivalently, a decibel is onetenth of a bel). P and P0 must measure the same type of quantity, and have the same units before calculating the ratio. If P = P0 in the above equation, then LP = 0.
What is the decibel of a signal?
It expresses the ratio of two values of a power or rootpower quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 10 1/10 (approximately 1.26) or rootpower ratio of 10 1⁄20 (approximately 1.12 ).
Why is decibel important?
The decibel is useful for representing large ratios and for simplifying representation of multiplied effects such as attenuation from multiple sources along a signal chain. Its application in systems with additive effects is less intuitive.
How do decibels work?
The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. The unit for loss was originally Miles of Standard Cable (MSC). 1 MSC corresponded to the loss of power over a 1 mile (approximately 1.6 km) length of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to the average listener. The standard telephone cable implied was “a cable having uniformly distributed resistance of 88 Ohms per loopmile and uniformly distributed shunt capacitance of 0.054 microfarads per mile” (approximately corresponding to 19 gauge wire).
How to calculate gain of a multicomponent amplifier?
Level values in decibels can be added instead of multiplying the underlying power values, which means that the overall gain of a multicomponent system, such as a series of amplifier stages, can be calculated by summing the gains in decibels of the individual components , rather than multiply the amplification factors; that is, log (A × B × C) = log ( A) + log ( B) + log ( C ). Practically, this means that, armed only with the knowledge that 1 dB is a power gain of approximately 26%, 3 dB is approximately 2× power gain, and 10 dB is 10× power gain, it is possible to determine the power ratio of a system from the gain in dB with only simple addition and multiplication. For example:
How to scale decibels?
That is, a change in power by a factor of 10 corresponds to a 10 dB change in level . When expressing rootpower quantities, a change in amplitude by a factor of 10 corresponds to a 20 dB change in level. The decibel scales differ by a factor of two, so that the related power and rootpower levels change by the same value in linear systems, where power is proportional to the square of amplitude.
Why do we use suffixes in dB units?
Suffixes are commonly attached to the basic dB unit in order to indicate the reference value by which the ratio is calculated. For example, dBm indicates power measurement relative to 1 milliwatt.
What is the highest frequency of a piccolo?
Highfrequency sounds of 2 – 4,000 Hz are the most damaging. The uppermost octave of the piccolo is 2,048 – 4,096 Hz.
How much hearing loss is there in classical music?
The incidence of hearing loss in classical musicians has been estimated at 4 – 43%, in rock musicians 13 – 30%.
Can noise cause hypertension?
Hypertension and various psychological difficulties can be related to noise exposure.
What is 70 decibels?
Seventyfive decibels is about the loudness of chamber music in a small auditorium. It is just above a normal speaking voice, which is about 65 to 70 decibels. It is just below a telephone dial tone, which registers at 80 decibels. A decibel is a unit of sound level measurement.
Why are decibels measured on a logarithmic scale?
Decibels are measured on a logarithmic scale of loudness because human ears detect changes in volume in a nonlinear fashion. A difference of 1 decibel is the minimum change in volume. Three decibels difference is a moderate change in volume.
What is the loudest sound possible?
Death of the hearing tissue in the ear occurs at 180 decibels. The loudest sound possible on the decibel scale is 194 decibels. ADVERTISEMENT.
How loud is a whisper?
The threshold of hearing is zero decibels. A whisper is about 15 to 25 decibels. Background noise is generally about 35 decibels. The level at which sustained exposure might result in hearing loss is 90 to 95 decibels. Ear pain begins when the sound level gets up to 125 decibels. At 140 decibels, even short term exposure can result in permanent damage. This is also the loudest recommended exposure, even with hearing protection. Death of the hearing tissue in the ear occurs at 180 decibels. The loudest sound possible on the decibel scale is 194 decibels.
What Is A Decibel?
Decibel Equivalent Tables

Inaudible Range (Less than 10 dB) Since it’s logarithmic and relative, the decibel scale is also limitless in both directions and doesn’t stop at 0. Zero dB is theoretically the lowest limit of human perception, but in practice, a human will rarely be able to hear a sound below 10 dB. Barely Audible Range (10 to 40 dB) You’ll be able to hear these, but it will take a lot of effort, and there can’t be …
Volume Effects on The Human Body

Above 140 dB, sounds can cause humans physical distress: shortness of breath, nausea, nosebleeds, and other severe discomforts. Below that level, they are still able to cause permanent problems, including hearing loss and persistent tinnitus. Make sure you always have hearing protection, no matter how badass your car’s rig might be.
Overview
The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or rootpower quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 10 (approximately 1.26) or rootpower ratio of 10 (approximately 1.12).
The unit expresses a relative change or an absolute value. In the latter case, the numeric value e…
History
The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid1920s, the unit for loss was Miles of Standard Cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a listener. A standard telephone cable was “a cable having uniformly di…
Definition
ISO 800003 describes definitions for quantities and units of space and time.
The IEC Standard 600273:2002 defines the following quantities. The decibel (dB) is onetenth of a bel: 1 dB = 0.1 B. The bel (B) is 1⁄2 ln(10) nepers: 1 B = 1⁄2 ln(10) Np. The neper is the change in the level of a rootpower quantity when the rootpower quantity changes by a factor of e, that is 1 Np = ln(e) = 1, thereby relating all of the units as nondimensional natural log of rootpowerquant…
Properties
The decibel is useful for representing large ratios and for simplifying representation of multiplicative effects, such as attenuation from multiple sources along a signal chain. Its application in systems with additive effects is less intuitive, such as in the combined sound pressure level of two machines operating together. Care is also necessary with decibels directly in fractions and with the units of multiplicative operations.
Uses
The human perception of the intensity of sound and light more nearly approximates the logarithm of intensity rather than a linear relationship (see Weber–Fechner law), making the dB scale a useful measure.
The decibel is commonly used in acoustics as a unit of sound pressure level. The reference pressure for sound in air is set at the typical threshold of perception of an average human and th…
Suffixes and reference values
Related units
mBm mB(mW) – power relative to 1 milliwatt, in millibels (one hundredth of a decibel). 100 mBm = 1 dBm. This unit is in the WiFi drivers of the Linux kernel and the regulatory domain sections.
See also
• Apparent magnitude
• Cent (music)
• dB drag racing
• Decade (log scale)
• Loudness