How to use this calculator
Compare two notes and find the interval name plus upward and downward semitone distances.
How the calculation works
- Choose a starting note.
- Choose a target note.
- The tool calculates pitch-class interval values.
Formula
Semitones up = (target index - start index + 12) mod 12.
Example
C to E is a major third, four semitones up.
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 octave-specific compound intervals.
- Enharmonic spellings 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.