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MIDI Note Lookup
MusicLook up any MIDI note number to get the note name, octave, and frequency in Hz.
ttb run midi-note-lookup
MIDI
69
Note
A4
Frequency
440.00 Hz
Quick Reference
| Octave | C | D | E | F | G | A | B |
|---|---|---|---|---|---|---|---|
| 3 | 48 | 50 | 52 | 53 | 55 | 57 | 59 |
| 4 | 60 | 62 | 64 | 65 | 67 | 69 | 71 |
| 5 | 72 | 74 | 76 | 77 | 79 | 81 | 83 |
Formula: Hz = 440 × 2^((MIDI−69)/12)
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如何使用 MIDI Note Lookup
Enter a MIDI note number (0–127) or a note name like C4 or A#3. Instantly see the MIDI number, note name, and frequency in Hz.
1
Type a MIDI number or note
Enter 69 to get A4 (440 Hz), or type "C4" to get MIDI 60.
2
Read the results
See all three values: MIDI number, note name with octave, and exact Hz frequency.
3
Use the quick table
Click any value in the reference table to look it up instantly.
常见问题
What is MIDI 60?+
MIDI 60 is Middle C (C4), the C note in the 4th octave, at approximately 261.63 Hz.
What is the frequency formula?+
Hz = 440 × 2^((MIDI − 69) / 12). MIDI 69 is A4 = 440 Hz, which is the standard tuning reference.