Sound Level Meter Online

No. This is a browser-based estimation tool, not a calibrated SPL meter. Professional sound level meters use a Class 1 or Class 2 calibrated microphone and conform to IEC 61672. The readings here depend entirely on your device's built-in microphone, which varies significantly between phones, laptops, and headsets. Use this tool for rough checks, practice room assessments, and educational purposes rather than regulatory or engineering measurements.

Start with a known reference: generate a tone at a comfortable listening volume with a speaker and move the device to a distance where you expect roughly 70–75 dB (normal conversation level). Adjust the sensitivity slider until the reading matches. Once set for your specific microphone and environment, the relative readings become useful for comparing loud vs. quiet sounds even if the absolute dB value is an estimate.

Sound levels above 85 dB sustained for more than an hour can cause gradual hearing damage over time. A live rock concert typically measures 100–115 dB, which is unsafe without hearing protection for extended exposure. For practice with amplified instruments, aim to keep sustained levels below 85 dB. Use the meter's average reading — not the peak — as your guide for sustained exposure.

Sound level varies naturally with every note, word, or noise in the room. The live bar reflects the instantaneous signal, which will always jump around. The average display smooths this over a short window and is more useful for judging overall loudness. The peak marker shows the loudest moment detected, which is useful for checking whether transient peaks are clipping your microphone input.

Yes, this is a practical use case. Place your device in the center of the room, stop speaking, and watch the floor level — this is your ambient noise floor. A quiet room suitable for home recording typically has a noise floor below 40 dB. If the meter shows 50–60 dB with no one speaking, you may have HVAC, street noise, or computer fan noise that could affect recordings.

Normal face-to-face conversation at about one metre distance registers approximately 60–65 dB. A quiet library is around 30–40 dB; a busy restaurant around 70–75 dB; a vacuum cleaner at one metre is around 70 dB. These values give you a real-world reference when interpreting readings from the online meter. Keep in mind that the meter reads relative levels based on your microphone — the absolute values are estimates, not precision measurements.

A typical live rock or pop concert measures 100–115 dB at audience distance from the speakers. Sustained exposure above 85 dB for more than one hour can begin to cause hearing damage over time; at 100 dB damage can occur after about 15 minutes of continuous exposure. The WHO recommends no more than 40 hours per week above 80 dB. If you attend concerts regularly, foam earplugs (which reduce level by 25–33 dB) are a practical and inexpensive form of protection.

The peak reading captures the loudest single moment detected by the microphone — a hand clap, a plucked string, or a door slamming. The average reading smooths the level over a short window and reflects the typical sustained loudness of the environment. For hearing safety, average dB is the relevant measure, because hearing damage is caused by sustained exposure rather than brief transients. For recording, peak levels matter more because they indicate whether the microphone input is clipping.

Start by identifying the main noise sources: HVAC systems, street traffic, and computer fans are the most common. Soft furnishings — carpets, curtains, bookshelves, sofas — absorb mid and high frequency reflections and reduce overall room noise. For electric instruments, use headphone amps or practise at low volume rather than an open speaker cab. The online meter can help you verify whether your improvements are working by comparing floor noise levels before and after changes.

It is an estimate based on the microphone signal, not professionally calibrated, but useful for comparisons and monitoring.

Yes, browser microphone access is required, just like the instrument tuners.