Decibel meter
Measured in this tab. Nothing is recorded or uploaded.
— dB(A)
- Min
- —
- Max
- —
- Average (Leq)
- —
- Measured for
- —
Typical levels
- Breathing
- 10 dB
- Whisper
- 30 dB
- Library
- 40 dB
- Quiet office
- 50 dB
- Conversation
- 60 dB
- Vacuum cleaner
- 70 dB
- Heavy traffic
- 85 dB
- Motorcycle
- 95 dB
- Rock concert
- 110 dB
- Siren up close
- 120 dB
An estimate from your device's microphone, not a certified meter. Readings above about 100 dB may be capped by the microphone.
How to use this tool
Measure how loud a room or machine is in dB(A) with your microphone. Nothing is recorded.
Open Decibel meter
Press Start and allow the microphone. Keep the device still and pointed at the sound.
Read the level
The big number is the current level. Min, Max and Average (Leq) build up while it measures.
Calibrate if you can
Next to a real sound level meter, change Calibration until both match. The offset is remembered.
FAQ
How accurate is an online decibel meter?
It gives a useful estimate, often within a few dB after calibration, but it is not a certified sound level meter. Phone and laptop microphones differ and are less sensitive at very low and very high levels.
What is dB(A)?
Decibels with A-weighting, which turns down low and very high frequencies the way human hearing does. Noise limits and hearing safety guidelines are usually given in dB(A). Choose Z (unweighted) to see the flat level.
How do I calibrate it?
Put a real sound level meter next to your device, play a steady sound, and change Calibration until both read the same. The offset is saved in this browser. Without a meter, compare with a known source such as a quiet room (about 30–40 dB).
What level is harmful?
Long exposure above 85 dB(A) can damage hearing. NIOSH recommends at most 8 hours at 85 dB(A), halving the time for every 3 dB more: 4 hours at 88, 1 hour at 94, 15 minutes at 100.
Is the sound recorded or uploaded?
No. The microphone signal is analysed in this tab and thrown away. Nothing is recorded, stored or uploaded.