音符周波数計算機
A4=440 Hzを基準に、全オクターブの任意の音符の周波数（Hz）を計算します。
Frequency
440.00 Hz
All octaves for selected note
| Note | MIDI | Hz |
|---|
How to use
- Select the note name and octave number from the dropdowns.
- The frequency in Hz and MIDI note number appear instantly.
- The table below shows that note's frequency across all octaves.
Related music tools
- Online Tuner (A=440 Hz) — play reference pitches to tune your instrument
- Interval Trainer — learn intervals between notes
- Chord Finder — find notes in any chord
More ways to use this tool
- A440 Reference Pitch Calculator — verify the A4=440 Hz concert pitch standard
- MIDI Note Frequency Chart — look up Hz for any MIDI note number
よくある質問
- Is this note frequency calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.
Last updated: By jarvisbox