Note Frequency Calculator
Find the exact frequency in Hz for any note at any octave. Uses standard concert pitch A4=440 Hz.
100% client-side · no upload
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
常見問題
- 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.