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440 Hz Tone
Standard concert pitch reference tone at A4 (440 Hz).
Fixed frequency: 440 Hz (A4 concert pitch)
Signal
Download a 440 Hz reference WAV (2 seconds, 44.1 kHz).
What this tool does
This page plays a continuous 440 Hz tone — the international standard for concert pitch A4. Musicians, audio engineers, and students use it to tune instruments, verify speaker response at a known frequency, and compare against alternative tunings like 432 Hz.
How to use it
Tap Play to unlock audio (required on mobile). Adjust volume conservatively, especially with headphones. Switch waveforms to hear how harmonics change the timbre while the fundamental stays at 440 Hz. Download WAV for an offline reference file.
Practical applications
Orchestras tune to A440 before performances. Guitarists can match open strings against this tone. Studio engineers use 440 Hz during setup alongside pink noise for room checks. If you need other reference pitches, try our 432 Hz or 1000 Hz pages.
How to use
Adjust settings
Use sliders and controls to set frequency, volume, and waveform. Changes apply in real time.
Export or share
Download a WAV file or copy a share link. All processing stays on your device.
Frequently asked questions
Why is 440 Hz standard tuning?
Most Western music uses A4 = 440 Hz as ISO 16 concert pitch.
Can I download a 440 Hz WAV?
Yes. Use Download WAV for a 44.1 kHz reference tone.