Music Note ↔ Frequency

Equal temperament (12‑TET). Convert note names (e.g. A4, C#3, Db5) ↔ frequency (Hz). Generate common scales from a root note.

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Note → Frequency

Formats: A4, C#3, Db5. Octaves use scientific pitch notation (A4=440).

Frequency → Nearest Note

Scale Generator

Tip: in 12‑TET, one semitone = 100 cents. This tool shows detune in cents relative to the nearest equal‑tempered note when converting from Hz.

Bulk (one per line)

Paste notes (A4) or frequencies (440). We auto-detect per line and output both forms.

Principle: runs entirely in your browser. No uploads. No analytics.