This tool is absolutely free.

Decibel Meter turns your iPhone, iPad and iPod touch into a professional accurate sound meter, precisely measures the sound pressure level all around you. This extremely useful tool. Have you wondered how quiet is your room or how loud is a rock concert or sport event? Decibel Meter will help you answer all those right now.

A decibel meter is a device which measures sound pressure to determine how intense sounds are, measuring in decibels. Decibels are a logarithmic scale based on the sensitivity of the human ear. Prolonged exposure to sounds over 85 decibels can lead to hearing loss, making measurement of decibel levels important for people who work in noisy environments so that they know when they need to protect their ears.

For a frame of reference, normal conversation occurs between around 40 and 60 decibels, depending on who is talking. A firecracker is about 140 decibels, and a jackhammer runs at around 100 decibels. Musicians, mechanics, construction workers, and other people who work in loud environments can endanger their hearing, especially if they work in environments with explosives, which can generate sound waves intense enough to cause pain and immediate hearing damage. A decibel meter can indicate when sound has reached the danger zone.

The decibel meter measures the sound pressure and provides a reading in decibels for the convenience of the user. Some may also provide readings in other units of measurement, depending on the uses they are intended for. Decibel meters are often designed to be portable so that people can move them around as needed, and are often hand held, although sometimes they can be part of a permanent instrument array which is designed to take continuous measurements in a given area.

One application in which a decibel meter can be used is in the reinforcement of municipal codes. Many municipalities bar sounds above a certain decibel level for safety and comfort, and may have restrictions on noise during certain hours. Police officers can carry decibel meters to determine whether or not a sound is violating the noise ordinance. These devices are also used in noise pollution studies which are used to determine the impact of passing vehicles, aircraft, and other sound-generating objects on a community.

The decibel meter is also used in the music industry, during recording and setting up for concerns as well as monitoring of conditions in a concert. Similarly, meters may be installed in noisy workplaces to monitor conditions, and may be designed to send out alerts when people need to wear ear protection or take other precautions to protect their hearing. These devices are also utilized in testing of hearing protection such as ear plugs and headphones, with such products coming with a decibel ratings to provide an indicator as to which settings they can and should be used in.

What’s New

Version 6.0

Updated for XR XS Max

Ratings and Reviews

3.6 out of 5
271 Ratings

271 Ratings

9tailfae ,

Consistent but over-sensitive

The calibration is off on the over-sensitive side. My talking quietly...just loud enough to activate Siri with a (sturdy install, not wobbly) ceiling fan in the background and the iPhone about 12-14 inches away from my face...registered at 75-80 dB. The good news is it's consistent, just need to be able to calibrate. My 2-star rating would easily be 4-5 stars if there was a way to calibrate or establish a relative baseline.

ThisIsNotBackwards ,

Not good

This app is extremely microphone sensitive. When I opened it the decibel meter was reaching a yellow color near the top, and keep in mind I was laying in bed a 2:12 AM because I couldn’t sleep so it was completely silent in the room. I set my phone down on my bedside table and now the decibel meter was jumping between the 30-40 range. I wasn’t moving at all and couldn’t even hear myself breath. The only noise in the room was my little brother sleeping and breathing kinda loud, but I knew it wasn’t loud enough or close enough to set the meter off as he was like nearly 10 feet away. I don’t like talking bad about things because it usually means less sales for the creator if people decide to listen to this but I mean this app kinda has it coming from how sensitive it was.

Nickname choices ,

Not scientific but this app is not accurate.

Sitting in a quiet room, this app shows 70db. Maybe it hears my tinitus; this, it adds 20+ db to reality.

I asked my 8-year old son and my Lady to engage in basic conversation with me to develop a baseline. The app recorded 85-95db while my phone was in its Lifeproof case, which degrades sound transference more than the people I talk to on the other end would prefer.

I then walked outside to record the db of my 10kw generator. The app showed the exhaust was around 105. The generator has been shown in previous tests with several other apps (and the digital microphone our industrial hygienist uses at my place of work) as around 85. I will keep looking.


Xiangyi Liu
24.1 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese, Portuguese, Russian, Simplified Chinese, Traditional Chinese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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