Tuning Fork Generator

Get a pure reference pitch instantly. Tap the A440 button for concert pitch, choose from common tuning presets, or dial in any frequency from C0 to B8. Perfect for choir directors, a cappella singers, and instrument tuners — clean, fast, and processed entirely in your browser.

Ready

440

Hz

A4

Tuning Presets

Custom Frequency (Hz)

Note Selector

Waveform

Volume: 75%

Auto-Stop Timer

Gentle Fade In/Out (0.1s ramp to avoid clicks)

How to Use the Tuning Fork Generator

Tap A440 for Instant Concert Pitch

Click the large A 440 Hz button to immediately hear the standard concert pitch reference tone. The pure sine wave plays through your speakers or headphones — no setup needed. Use the tuning presets (A442, Bb3, C4, E4, G3) for other common reference pitches.
Choose Any Note or Custom Frequency

Select any note from C0 to B8 using the dropdown, or type an exact Hz value in the custom frequency field. The display shows the current frequency, nearest note name, and cents deviation. Click “Play” to hear your selection.
Adjust Volume & Timer

Set a comfortable volume with the slider. Choose an auto-stop timer (5s, 10s, 30s) so the tone stops automatically, or select Continuous to play until you tap Stop. The fade toggle adds a gentle 0.1-second ramp to prevent speaker clicks.

Frequently Asked Questions

What is A440 and why is it the standard tuning reference?

A440 means the note A above middle C vibrates at exactly 440 Hz. It was adopted as the international tuning standard (ISO 16) in 1955. Orchestras, choirs, and instrument manufacturers worldwide tune to this reference so that all instruments sound in tune with each other. Some European orchestras use A442 or A443 for a slightly brighter sound.

Why does this tool only produce sine waves?

A real tuning fork produces a nearly pure sine wave — a single frequency with no harmonics. This tool replicates that behavior exactly. A pure sine wave is ideal for tuning because it gives you a clean, unambiguous pitch reference without overtones that could confuse your ear or a tuner. If you need other waveforms, try our Tone Generator.

Can I use this to tune my instrument?

Yes! Select the reference pitch you need (e.g., A440 for most instruments, or use the note selector for specific strings), play the tone, and tune your instrument to match. For guitar, common references are E2 (82.41 Hz), A2 (110 Hz), D3 (146.83 Hz), G3 (196 Hz), B3 (246.94 Hz), and E4 (329.63 Hz). For a more interactive experience, try our Chromatic Tuner which listens to your instrument via microphone.

What is the difference between A440 and A442?

A440 (440 Hz) is the international standard. A442 (442 Hz) is used by many European orchestras, particularly in Germany, Austria, and some ensembles in France. The 2 Hz difference produces a slightly brighter, more brilliant sound. Both presets are included so you can match whichever standard your ensemble uses.

Is any data uploaded or recorded?

No. All audio generation happens 100% locally in your browser using the Web Audio API. No sound is recorded, no data is sent to any server. The tool works completely offline once loaded.

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