Microphone Sensitivity Tester - Online Input Level Meter

A microphone sensitivity test measures how well your microphone picks up sound by analyzing the input signal level in decibels (dB). This online tool uses your browser's Web Audio API to capture real-time audio from your mic and displays the level on a visual meter, helping you determine if your microphone is too quiet, too loud, or just right for clear audio recording or communication.

Click the "Start Mic Test" button and grant microphone permission when prompted by your browser. Once active, speak or make sound near your microphone. The level meter will display real-time input levels in dBFS (decibels relative to full scale). The meter colors indicate signal strength: green for healthy levels (-40 to -20 dB), yellow for moderately loud (-20 to -10 dB), and red for near-clipping levels (above -10 dB). Peak and average readings help you assess overall sensitivity.

For most speech and vocal recording, a healthy average input level falls between -25 dB and -10 dBFS, with peaks reaching up to -6 dBFS. Levels consistently below -40 dBFS indicate a weak signal that may require gain adjustment. Levels frequently hitting 0 dBFS will cause digital clipping and distortion. The green zone on our meter represents the ideal recording range.

Low microphone levels can result from several factors: the microphone may be too far from the sound source, the mic's physical gain knob or software volume may be set too low, your operating system's input volume may need adjustment, the microphone itself may have low sensitivity specifications, or drivers may need updating. Try moving closer to the mic, checking system sound settings, and ensuring no physical mute switch is engaged. Some condenser microphones also require phantom power to function properly.

Yes! After starting the test, a device selector dropdown will appear listing all available audio input devices detected by your browser. You can switch between built-in microphones, USB mics, headset mics, or any other connected audio input device to compare their sensitivity and input levels in real time.

Peak level is the highest instantaneous signal level detected, useful for identifying potential clipping. Average (RMS) level represents the overall loudness over time and better correlates with perceived volume. Our tool displays both: the peak hold indicator on the meter shows recent maximums, while the average reading helps you understand your microphone's typical sensitivity during use.

Yes, this tool works on modern mobile browsers including Safari on iOS and Chrome on Android. On mobile devices, you'll be prompted to allow microphone access. Note that some mobile browsers require a secure HTTPS connection for microphone access to function. The responsive design ensures the level meter and controls are usable on smaller screens.

This tool provides a reliable relative measurement of your microphone's input level using the browser's Web Audio API. While not a substitute for professional calibrated SPL meters, it accurately reflects the digital signal level your system receives. The dBFS readings are precise for comparative testing and troubleshooting. For professional calibration, dedicated hardware audio meters are recommended.

Microphone sensitivity is a fixed physical characteristic of the microphone capsule, typically measured in mV/Pa or dBV/Pa, indicating how much electrical output it produces for a given sound pressure level. Gain is the amplification applied to the signal after the microphone, adjustable through software or hardware. This tool measures the combined result—your effective input level after both sensitivity and gain are applied—which is what matters for practical recording quality.