Decibel Meter – Free Online Noise Measurement
Measure ambient noise levels in real-time dB using your microphone. Displays current, peak, and average readings with a noise level guide.
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dB
측정 대기 중
020406080100+
최대
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평균
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최소
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소음 레벨 기준표
~ 30 dB
조용한 도서관, 속삭임
30 ~ 50 dB
조용한 사무실, 가정 실내
50 ~ 70 dB
일반 대화, 사무실 소음
70 ~ 90 dB
교통 소음, 진공청소기
90 dB ~
공사장, 콘서트 (청력 주의)
Frequently Asked Questions
Q. Are the measurements accurate?
Accuracy depends on microphone sensitivity, which varies by device. Use readings for relative comparison rather than absolute measurements. For precision, use a dedicated sound level meter.
Q. Do I need to grant microphone permission?
Yes. Click "Start Measuring" and allow microphone access when prompted. Audio data is never sent to a server.
Q. What are typical noise level guidelines?
Below 30 dB is very quiet (library). 30–50 dB is a quiet office. 50–70 dB is normal conversation. 70–90 dB is traffic noise. Above 90 dB can cause hearing damage.