Windows and Mac both have built-in tools to measure decibel levels, but they work differently and have real limits
Your PC can measure sound volume in decibels, but not the way a professional sound meter does. Windows includes a volume meter in the Sound settings that shows relative loudness in real time. Mac has a similar tool in System Preferences under Sound. Neither one gives you the actual decibel reading in dB SPL (the standard unit for sound pressure)—they show you a percentage or a visual bar that tells you whether sound is getting louder or quieter, which is useful for balancing audio levels but not for measuring absolute noise in a room.
If you need to know the actual decibel level of noise around you—say, to check if a fan is too loud or if your workspace is quiet enough—you will need a third-party app or a dedicated sound meter. Your phone's microphone can do this with the right app, and some PC software can too, though the accuracy depends on your equipment's microphone quality.
Key Takeaways
- Windows Sound settings show a real-time volume meter that displays relative loudness as a percentage, not actual decibels.
- Mac's Sound preferences include a similar input level meter that visually shows whether sound is getting louder or quieter.
- Built-in PC tools cannot measure the decibel level of sound in your room—they only show audio file or input volume.
- To measure actual room noise in decibels, use a smartphone app with a sound meter or a dedicated hardware sound meter.
- PC microphone quality affects accuracy, so readings from a laptop mic are less reliable than readings from a dedicated meter.
How to view the volume meter in Windows Sound settings
Open the Windows Start menu and type "Sound settings" into the search box. Click the Sound settings result to open the Sound panel. Scroll down to the "Input" section and look for "Input volume"—you will see a horizontal bar with a moving indicator that responds to sound picked up by your microphone in real time.
Speak into your microphone or play audio near it, and watch the bar move. The further right the indicator goes, the louder the sound. This meter shows you relative volume—it tells you whether one sound is louder than another—but it does not tell you the decibel level. If you need to record audio and want to avoid distortion, this meter helps you set a safe input level before you start recording. Keep the indicator in the middle to upper-middle range to avoid clipping (the harsh sound that happens when audio is too loud).
How to view the input level meter on Mac
Click the Apple menu in the top-left corner and select System Preferences (or System Settings on newer macOS versions). Click Sound, then click the Input tab. You will see a list of input devices (microphone, line in, etc.) and below that an "Input level" meter that shows a horizontal bar with a moving indicator.
Make a sound near your microphone and watch the bar respond. Like the Windows meter, this shows relative volume, not actual decibels. The meter helps you check that your microphone is picking up sound and that the level is not too high (which causes distortion). Aim to keep the indicator in the middle range during normal speaking or recording.
Why PC meters do not show actual decibel readings
A decibel is a unit that measures sound pressure relative to a reference point. When someone says a sound is "80 decibels," they mean it is 80 dB SPL (sound pressure level), which is a specific measurement of how much pressure the sound wave creates. Your PC's volume meter does not measure this. Instead, it shows the amplitude of the audio signal going into or coming out of your computer—a different thing entirely.
The difference matters. A song file can have a high amplitude (show a high reading on the meter) but be played at a low volume through your speakers. The same song played at maximum speaker volume will be much louder in the room, but the file's amplitude reading stays the same. To know the actual decibel level of sound in your space, you need to measure the sound waves in the air, not the digital signal inside your computer.
Using your smartphone to measure room noise in decibels
Your phone's microphone can measure sound levels with the right app. Search your phone's app store for "sound meter" or "decibel meter." Popular options include Decibel X (iOS and Android), NIOSH Sound Level Meter (Android), and Noise Meter (Android). read one and open it in the room where you want to measure noise.
Hold the phone at ear level and keep it still. The app will show a decibel reading that updates in real time. Keep in mind that phone microphones vary in quality, so readings from different phones may not match exactly. A dedicated sound meter (a handheld device that costs $30 to $100) is more accurate, but a phone app gives you a rough measurement that is useful for comparing noise levels or checking whether a space is quieter than another.
PC software that measures sound in decibels
Some audio software for Windows and Mac can measure sound levels in decibels, but most require you to record audio first or use a microphone input. Audacity (free, Windows and Mac) is a popular audio editor that shows a waveform and can display decibel levels of recorded audio. Open Audacity, click the microphone icon to set up recording, then record a few seconds of the sound you want to measure. The waveform display shows the amplitude, and you can hover over the waveform to see decibel values.
This method works better than the built-in meters for comparing audio files, but it still depends on your microphone's quality. For measuring actual room noise (not audio files), a smartphone app or hardware meter remains more practical. If you are working with audio production and need to see levels while recording, Audacity or professional audio software like Adobe Audition or Reaper will give you more detail than Windows or Mac's basic meters.
Common mistakes when trying to measure sound on your PC
The biggest mistake is assuming the Windows or Mac volume meter shows decibels. It does not. If someone tells you "the meter shows 75 decibels," they are misreading what the meter displays. The percentage or bar position is not a decibel measurement.
Another common error is placing your microphone too close to the sound source. If you are trying to measure room noise and you hold the microphone right next to a speaker or fan, the reading will be much higher than the actual noise level in the room. Keep the microphone at ear level and at least a foot away from the source you are measuring.
A third mistake is not accounting for background noise. If you are measuring a specific sound (like a computer fan), do it in the quietest part of your space and at a time when other noise is minimal. Background noise will add to your reading and make the measurement less useful.
Frequently Asked Questions
Can I measure decibels with my PC microphone?
Your PC microphone can pick up sound and send it to software that displays decibel readings, but the accuracy depends on the microphone quality. Built-in laptop microphones are less accurate than external USB microphones. A smartphone app or dedicated sound meter will give you more reliable readings for measuring actual room noise.
What is the difference between the volume meter and decibel measurement?
The volume meter shows the strength of an audio signal (how loud the file or input is), while decibels measure the actual sound pressure in the air. A file can have high volume in the meter but play quietly through your speakers, or play very loudly at the same meter reading. Decibels measure what you actually hear in the room.
Why does my PC meter show different readings when I measure the same sound twice?
Microphone sensitivity, background noise, and the exact distance and angle of the microphone all affect the reading. If you are using a phone app or PC software, small changes in microphone position or room conditions will shift the number. For consistent measurements, keep the microphone in the same spot and measure at the same time of day when background noise is similar.
Is a phone sound meter app accurate enough for checking if my workspace is too loud?
Phone apps give you a rough measurement that is useful for comparing one space to another or checking whether noise has gotten louder. They are not precise enough for professional sound engineering or safety compliance testing, but they work well for everyday decisions like whether a fan is too noisy or if your office is quieter than a coffee shop.
What decibel level is considered too loud for an office?
Most offices aim for 50 to 60 decibels, which feels quiet and allows normal conversation. Above 70 decibels becomes distracting, and above 85 decibels can cause hearing damage with long-term exposure. If you measure your workspace and want to know whether the level is safe, compare your reading to these ranges.