MIDI note to frequency converter
Enter a MIDI note number to find its name and frequency in Hz. This calculator uses twelve-tone equal temperament with A4 at 440 Hz.
Uses twelve-tone equal temperament. This tool names MIDI note 60 as C4; octave labels vary between manufacturers and apps.
Common MIDI note numbers
| MIDI number | Note | Frequency (Hz) |
|---|---|---|
| 36 | C2 | 65.41 |
| 48 | C3 | 130.81 |
| 60 | C4 | 261.63 |
| 69 | A4 | 440.00 |
| 72 | C5 | 523.25 |
| 84 | C6 | 1046.50 |
About octave labels
MIDI carries a note number, not an octave name. Some manufacturers label middle C differently. Check the number when comparing devices; this tool uses C4 for note 60.
How frequency is calculated
Frequency in Hz = 440 × 2 raised to the power of ((MIDI note number − 69) ÷ 12). This gives note 69 a frequency of 440 Hz; twelve note numbers higher doubles the frequency.
A pitch calculation does not check MIDI reception. If your synth is silent, use the missing MIDI notes guides for your model. For delay timing, use the BPM to milliseconds calculator.