dBmeter
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Sound tools

Decibel meter

Estimate current, average, and peak sound level from your microphone with an adjustable calibration offset.

  • Free to use
  • Runs on this device
  • No account
Idle

Microphone audio is analyzed on this device and is never uploaded.

Current level-- dB
Frequency20 Hz–20 kHz
This browser does not support the required Web Audio features.
Average-- dB
Peak-- dB
Calibration offset
+85 dB

Accuracy limits: Browser microphones are not calibrated sound-level meters. Use the readings for comparison and training only. Do not use them for legal, medical, or compliance decisions.

Procedure

Procedure

  1. Allow microphone access. Keep the device still. Prevent handling noise.
  2. Keep the same device position, browser, and input settings for each comparison.
  3. Set the calibration offset against a trusted reference meter. Then read the current, average, and peak values.

Function

What the reading means

An uncalibrated microphone gives a relative digital level. The displayed estimate includes your saved offset. It is not an IEC 61672 measurement or a verified dBA value.

Browser support

Use a current version of Safari, Chrome, Edge, or Firefox. Microphone tools require HTTPS and microphone permission.

Technical sources

How the browser decibel estimate is calculated

Where supported, the site disables echo cancellation, noise suppression, and automatic gain control. It removes the sample mean, calculates RMS amplitude, converts the value with 20 × log10(RMS), and adds the saved calibration offset.

Current is the latest estimate. Average is a five-second energy average. Peak is the highest estimate since Start. No A- or C-weighting is applied. An uncalibrated result is not a physical SPL measurement.

Calibrate for this device

  1. Put this device next to a trusted reference meter. Point both at the same steady source.
  2. Prevent wind, handling noise, clipping, and microphone movement.
  3. Adjust the offset until the readings agree. Keep the same device, browser, and input configuration.

Technical sources

MDN getUserMedia()NIOSH Sound Level Meter AppW3C Web Audio APIIEC 61672-1

Sound tools

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