How to use this calculator
Translate MIDI note numbers into note names, octaves, and equal-tempered frequencies.
How the calculation works
- Enter a MIDI note from 0 to 127.
- Adjust A4 reference tuning if needed.
- Read the note name and frequency.
Formula
Frequency = tuning x 2 ^ ((MIDI note - 69) / 12).
Example
MIDI note 69 is A4 at 440 Hz.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- MIDI note numbers outside 0-127 are rejected.
- This does not send MIDI messages to hardware.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.