Sound Meter

Measure sound levels in real-time and analyze audio files instantly.

Real-time Levels

RMS and Peak are shown in dBFS (digital scale).

Standby
RMS Level
—dBFS
Smoothed over time
Peak Level
—dBFS
No clipping
Estimated SPL
—dB
Requires calibration offset
Level History (Last ~10s)
RMS (Avg)
Peak

Settings

Auto-start
Resume on visit

Recording

Capture Audio
Record and download sample
Not recording

Quick Tips

• Keep the mic gain stable for consistent readings.
• Disable enhancements (noise suppression / AGC) if you need raw levels.
• Use the Calibration Offset to match a reference meter if available.

Understanding dBFS vs dB SPL

Most browsers expose microphone level as digital amplitude, which maps to dBFS (decibels relative to full scale). dB SPL (sound pressure level) requires calibration and device-specific microphone sensitivity.

Best practices for consistent readings

  • Keep the microphone gain fixed and disable automatic gain control when possible.
  • Measure at a consistent distance from the sound source.
  • Use the same device for comparisons to reduce hardware variance.