Disclaimer

Measurement Disclaimer

SoundMeter Online provides approximate sound level readings based on your device's microphone input. These readings are not calibrated, not traceable to any national or international measurement standard, and not suitable for any purpose requiring certified accuracy. The decibel values displayed are computed using standard RMS calculations applied to the raw audio signal captured by the Web Audio API, but without reference-level calibration, these values represent relative levels rather than absolute sound pressure levels.

Not a Medical Device

This tool does not assess hearing capability, diagnose hearing conditions, or measure hearing thresholds. It is not a medical device and has not been evaluated or approved by any health regulatory authority. If you suspect hearing damage or loss, consult a licensed audiologist or ENT specialist. Do not rely on dB readings from this tool to determine whether your hearing has been affected by noise exposure or to make decisions about hearing protection needs in occupational settings.

Not a Compliance Tool

Measurements from this website do not constitute evidence for regulatory compliance with OSHA, EPA, WHO, NIOSH, or any local, state, national, or international noise ordinance or regulation. Workplace noise assessments must be conducted with instruments meeting IEC 61672 Class 1 or Class 2 specifications, operated by qualified personnel, with current calibration certificates traceable to national standards. Environmental noise surveys for planning applications, construction permits, or neighbor disputes require similarly certified equipment and methodology.

Educational Content Disclaimer

The blog posts, guides, and educational articles published on SoundMeter Online are provided for general informational and educational purposes only. They do not constitute professional advice in acoustics, audiology, occupational health, environmental science, or any other professional discipline. While we strive to ensure the accuracy of our content by referencing published standards and peer-reviewed research, information may become outdated as standards are revised. Always verify critical information against current official sources and consult qualified professionals for decisions affecting health, safety, or legal compliance.

Hearing Safety Information

Our website references noise exposure guidelines published by organizations such as OSHA (90 dBA over 8 hours), NIOSH (85 dBA over 8 hours), and WHO (70 dBA over 24 hours for environmental noise). These guidelines are presented for educational context and general awareness. They should not replace a professional occupational health assessment, audiometric testing program, or hearing conservation plan. Individual susceptibility to noise-induced hearing loss varies based on genetics, age, existing hearing health, and other factors that cannot be assessed by a web-based tool.

Device Variability

Different devices produce significantly different readings for the same sound source due to hardware variations. Factors contributing to device variability include:

• Microphone type and quality — MEMS microphones in phones differ substantially from condenser microphones in laptops or USB microphones
• Microphone placement — built-in microphones may be partially occluded by device cases, positioned near fans, or affected by hand placement
• Analog-to-digital converter quality and bit depth
• Manufacturer-applied signal processing (noise gates, automatic gain control) that may persist despite our attempts to disable it via browser APIs
• Operating system audio pipeline processing that occurs before the signal reaches the browser
• Browser-specific Web Audio API implementations that may handle audio constraints differently

As a result, the same sound measured simultaneously on two different devices may show readings that differ by 5–15 dB or more. This is an inherent limitation of uncalibrated consumer hardware, not a defect in our tool.

Environmental Limitations

Browser-based sound measurement is affected by numerous environmental factors that reduce accuracy and reliability:

• Microphone frequency response limitations — most consumer microphones have poor sensitivity below 100 Hz and above 8 kHz, meaning very low-frequency rumble and high-frequency hiss may be underrepresented
• Room acoustics — reflections, standing waves, and reverberation can cause readings to vary based on microphone position within a room
• Wind and air movement across the microphone diaphragm creates turbulence noise that artificially inflates readings
• Mechanical vibrations transmitted through the device (e.g., a phone resting on a vibrating table) register as sound
• Electromagnetic interference from nearby electronics may introduce noise into the audio signal
• Digital clipping at very high sound pressure levels causes readings to plateau rather than accurately represent the true level
• Background noise floor of the microphone itself sets a lower limit below which meaningful measurement is impossible

For best results, use the tool in a controlled environment, keep the microphone unobstructed, and avoid touching or moving the device during measurement.

Factors Affecting Accuracy

In addition to device and environmental factors, the following technical aspects affect measurement accuracy:

• Browser audio processing that may not fully disable despite API constraints requesting echoCancellation=false, noiseSuppression=false, and autoGainControl=false
• Sample rate differences between the hardware microphone and the Web Audio API context
• FFT window size and overlap settings that affect frequency resolution and time resolution tradeoffs
• Lack of calibration against a known reference level (such as a 94 dB or 114 dB calibrator)
• A-weighting approximation applied in software rather than through certified analog filters

Appropriate Uses

This tool is appropriate for:

• General noise awareness and education
• Relative comparison between environments (e.g., "this room is louder than that room")
• Classroom noise monitoring for behavioral management
• Evaluating whether a space is approximately suitable for recording, podcasting, or video calls
• Understanding frequency content of ambient sound
• Tracking noise level trends over time within the same device and environment
• Demonstrating acoustics concepts in educational settings
• Quick informal checks before investing in professional measurement equipment

Third-Party References

Throughout our website, we reference and link to organizations including the World Health Organization (WHO), Occupational Safety and Health Administration (OSHA), National Institute for Occupational Safety and Health (NIOSH), Environmental Protection Agency (EPA), and International Electrotechnical Commission (IEC). These references are provided for educational and informational purposes. SoundMeter Online is not affiliated with, endorsed by, sponsored by, or officially connected to any of these organizations. We cite their published guidelines and standards to provide context for our educational content, but our tool has not been certified, approved, or validated by any of these bodies.

Affiliate Disclosure

In the future, SoundMeter Online may include links to products or services from third-party retailers (such as calibrated sound level meters, acoustic treatment materials, or hearing protection equipment). Some of these links may be affiliate links, meaning we may earn a small commission if you make a purchase through them, at no additional cost to you. Any such affiliate relationships will not influence our editorial content, tool recommendations, or measurement methodology. We will always clearly disclose affiliate links when they are present. Currently, we have no active affiliate partnerships.

Changes to This Disclaimer

We may update this disclaimer from time to time to reflect changes in our tool's capabilities, legal requirements, or industry best practices. When we make material changes, we will update the "Last updated" date at the top of this page. We encourage you to review this disclaimer periodically to stay informed about the limitations and appropriate use of our tool. Continued use of SoundMeter Online after changes to this disclaimer constitutes acceptance of the revised terms.

No Warranty

This tool is provided without warranty of any kind, express or implied, including but not limited to warranties of merchantability, fitness for a particular purpose, accuracy, or non-infringement. We make no claims about the accuracy, reliability, completeness, or timeliness of the measurements displayed. The entire risk arising from the use of this tool remains with you. Use at your own discretion and judgment.