How do I play an exact frequency?
Enter any value from 20 to 20,000 Hz in the Frequency field. The display also shows the period and nearest equal-tempered note for the current value.
20 to 20,000 Hz
Start at a low volume, especially when using headphones.
Measured before system volume and speaker output. This is not sound pressure (dB SPL). A reading of 0 dBFS corresponds to an RMS of 1.
Generate a continuous or timed test tone from 20 Hz to 20 kHz. Choose a waveform, set a safe volume, or use common frequency presets.
Gain ramps are used when starting and stopping to reduce audible clicks.
Sine waves contain one frequency, while square, triangle, and sawtooth waves include additional harmonics and sound brighter. The nearest musical note is an approximation based on A4 at 440 Hz.
Begin with the volume low and stop immediately if a tone is uncomfortable. Headphones can produce high sound pressure even when the browser volume appears modest. Very low and very high frequencies may be inaudible but can still drive speakers.
Enter any value from 20 to 20,000 Hz in the Frequency field. The display also shows the period and nearest equal-tempered note for the current value.
Use sine for a single clean frequency. Square, triangle, and sawtooth waves contain additional harmonics, so they sound brighter or sharper even at the same frequency.
Hearing sensitivity and speaker or headphone response decrease at frequency extremes. Not hearing a high tone does not prove that the generator or your audio device is faulty.
No. This page is designed for immediate continuous or timed playback and does not export an audio file.
For a steady sine wave, the same volume normally gives approximately the same digital RMS across frequencies, but output near the upper frequency limit can differ. Other waveforms can also differ. Use the live reading to compare levels; it may fluctuate briefly after a setting changes. Equal digital RMS does not guarantee equal sound pressure or perceived loudness.
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