How to use this calculator
Find the shortest semitone movement from one key to another and transpose individual notes.
How the calculation works
- Choose an original key and target key.
- Review the semitone difference.
- Optionally transpose a single note by that same distance.
Formula
Semitone difference is the signed pitch-class distance between keys.
Example
C to D is +2 semitones; C to G is -5 using the shortest signed distance.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- This V1 uses pitch classes, not full chord spelling.
- Enharmonic names are normalized to sharps.
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.