How loud is your room? Test it with a microphone

You may hear a constant hum, notice traffic outside, or simply wonder how noisy your room is. A microphone can give you a useful sound level reading, but the result depends on the device and where you place it.

Use the Noise Meter to check the sound around you in decibels. This guide explains how to take a consistent reading, what the number can tell you, and how to track down noise you want to reduce.

Measure the room noise

1. Open the Noise Meter. When your browser asks to use the microphone, allow access so the tool can measure sound.
2. Put the device where you want to know the noise level, such as your desk or the spot where you sleep. Keep the microphone uncovered and point it in the same direction for each test.
3. Stay quiet and let the reading settle. Wait at least 20 to 30 seconds so a single sound, like a cough or a passing car, does not stand in for the whole room.
4. Note the reading, then repeat it in another part of the room if you want to compare locations. Use the same device and setup for each measurement.

For a useful comparison, measure under similar conditions. A room reading with the window open cannot be fairly compared with one taken after you close it, unless you are deliberately checking the difference.

What the result means

The reading stays low and steady

There is little sound reaching the microphone at that spot during the test. This does not mean the entire room is silent. A computer fan, refrigerator, or road noise may be louder near its source than it is beside your microphone.

The reading rises and falls

Changing sounds are reaching the microphone. Common causes include voices, footsteps, traffic, heating or cooling equipment, and a fan cycling on and off. Watch the reading while you listen, then test again near a suspected source to see if the level changes.

The reading is higher than you expected

First check whether the sound is constant or comes in bursts. A steady hum may come from a fan or appliance. A brief increase could be a vehicle outside or someone moving nearby. Try measuring at a different spot before deciding the whole room has the same noise level.

The reading changes when you move the device

That is normal. Sound can be louder close to a source, and walls, furniture, and corners affect how it travels. A phone or laptop microphone may also respond differently depending on its position. For a closer look at device differences, see why phone and laptop noise readings differ.

How to get a steadier reading

1. Allow microphone access. If the meter cannot use the microphone, check the browser permission beside the address bar and allow access for the page. On Windows 11, open Settings › Privacy & security › Microphone. On macOS, open System Settings › Privacy & Security › Microphone and allow your browser. On Android, check Settings › Apps › your browser › Permissions › Microphone. On iPhone, check Settings › Privacy & Security › Microphone.
2. Keep the microphone clear. Do not cover it with your hand, a case, or fabric. If you are measuring with a laptop, avoid placing the microphone right beside its fan or a rattling surface.
3. Stop touching the device. Handling, tapping, or sliding a phone can cause a sharp reading even when the room itself is quiet. Set the device down and wait for the level to settle.
4. Use the same position each time. Keep the microphone at roughly the same height and distance from walls and noise sources. This makes before-and-after comparisons more useful.
5. Check the browser's microphone choice. If your computer has a headset or external microphone connected, the browser may use that instead of the built-in microphone. Disconnect the extra device or select the intended microphone in the browser's site controls, then measure again.

Reduce noise in the room

To find the cause, change one thing at a time. Temporarily move away from a fan, close a window, or pause a nearby appliance if it is safe to do so. Take another reading from the same position. If the level drops, you have a likely source to investigate.

For a steady mechanical hum, check whether a computer, ventilation system, or appliance needs cleaning or maintenance. Do not block ventilation openings to make a device quieter. If outside noise is the problem, closing gaps around doors and windows may help. Rugs, curtains, and other soft furnishings can reduce echoes inside the room, but they do not reliably block traffic or other loud sounds from outdoors.

What a decibel reading can and can't tell you

Decibels use a logarithmic scale. A change of 10 dB represents ten times the sound intensity, but it does not mean the sound will seem ten times louder. As rough context, a quiet library is often around 30 to 40 dB, while ordinary conversation may be around 60 dB. These are broad examples, not exact targets for every room.

The Noise Meter uses your device's microphone, which is designed for calls and recordings, not necessarily precise sound measurement. Microphone sensitivity, device placement, and browser processing can all affect the number. Treat the result as a practical way to compare locations or check whether a change made the room quieter, not as a certified reading for workplace rules, health decisions, or a noise complaint.

The Noise Meter measures sound through your browser while the page is open. It is not a sound recording tool.