What Is an Online Decibel Meter?
A browser-based decibel meter uses your device microphone to estimate ambient sound levels in real time, displaying readings in dB. This upgraded meter adds a live level graph, min/avg/max/peak session stats, a spectrum view, microphone selection, and a calibration offset. It is useful for checking noise in offices, gaming setups, restaurants, and music studios. Note: browser readings are relative, not certified SPL - real SPL needs hardware-calibrated meters because every microphone has different sensitivity and processing.
What the Advanced Meter Shows
The large number is the smoothed current reading. The stat cards track minimum, average/Leq, maximum, short rolling average, and peak for the current session. The 60-second graph helps you see whether a room is consistently noisy or only spiking, and the spectrum bars show whether the energy is mostly low rumble, midrange speech, or higher-frequency sound. If you own a reference sound level meter, use the calibration panel to save an offset for this browser and device.
How Loud Is My Room, and Can I Trust This Reading?
If you are using this meter to answer “how loud is my room, office, or PC fan?”, our guide How Loud Is My Room? Free Online Decibel Meter (and How Accurate a Browser Reading Really Is) shows how to measure correctly, gives a normal-dB reference chart, explains why a browser or phone reading is relative (realistically several dB off a calibrated meter), and tells you when you genuinely need a Class 1 or 2 sound level meter instead.
