Online Decibel Meter

What is Online Decibel Meter?

A simple browser tool that uses your device microphone to estimate sound levels in real time. It shows dB SPL, peak and average levels, plus a live graph and basic settings like calibration, weighting filters, peak hold, and smoothing. Readings are approximate because consumer microphones vary; this is not for legal or professional use. The site includes safety notes and reference sound levels to help you monitor and protect your hearing.

Key features

• Measures approximate sound levels in real time using your microphone.
• Displays peak, average, and dB SPL readouts with live graph.
• Offers calibration, weighting filters, peak hold, and smoothing options.
• Uses the Web Audio API to compute RMS-based decibel estimates.
• Provides safety notes and reference levels to protect your hearing.