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Sound Level Meter (dB)

Measure environmental ambient noise levels in decibels (dB SPL). Features real-time digital readouts, Min/Max/Average tracking, noise exposure hazard alerts, and continuous timeline logging.

Current Sound Level
0.0 dB
Waiting to start...
Decibel Timeline Log
Minimum 0.0 dB Lowest ambient floor
Average (Leq) 0.0 dB Equivalent continuous level
Peak Maximum 0.0 dB Highest transient burst
Noise Level Comparison Scale
20 - 30 dB: Very Quiet
Whisper, rustling leaves, quiet bedroom at night.
40 - 55 dB: Moderate
Quiet office, rainfall, refrigerator hum.
60 - 75 dB: Normal to Loud
Normal conversation, dishwasher, vacuum cleaner.
85+ dB: Hearing Hazard!
Heavy traffic, lawnmower, construction machinery. Prolonged exposure can damage hearing.
Sound Meter & Decibel Measurement Guide

How to Use This Tool

  1. Click "Start Decibel Meter" and grant microphone permission.
  2. Place your device on a stable surface in the room or environment you want to monitor.
  3. Observe the real-time decibel gauge and the historical trend graph to track ambient noise spikes.
  4. Check the Average dB and Peak dB readings over a few minutes to evaluate average noise exposure.
  5. Click "Reset Stats" whenever you want to begin measuring a new space.

How Decibels (dB) Work

Sound levels are measured logarithmically. Every 10 dB increase represents a ten-fold increase in sound energy and sounds roughly twice as loud to human ears. That means 60 dB (a busy restaurant) is ten times more intense than 50 dB (a quiet office), and 100 times more intense than 40 dB.

Safe Noise Levels & Hearing Protection

Environmental health standards (WHO & OSHA) recommend keeping prolonged daily sound exposure below 85 dB. Exposure to loud environments (over 85 dB for multiple hours, or brief spikes above 100 dB) can cause fatigue and long-term hearing degradation.

Microphone Calibration Notice

Different laptops and mobile phones have varying microphone sensitivities and automated gain control (AGC). This tool provides an excellent relative measure of noise levels and spikes in your room, though it is not a calibrated industrial sound meter.