Key Details
Selected Key
CMajor
Key signature
No sharps or flats
relative minor
C major scale
CDEFGAB
Diatonic chords
Click for diagramThe IV and V chords sit on either side of C on the wheel — the neighbouring keys are the most closely related, sharing all but one note.
How to Use
- 1Click any wedge on the wheel. The outer ring holds the 12 major keys; the inner ring holds their relative minors.
- 2The panel shows the key signature (how many sharps or flats), the notes of the scale, and the relative key that shares those notes.
- 3Use the Major / Minor toggle to switch the panel between the major key and its relative minor — the seven diatonic chords update to match.
- 4Click any diatonic chord to open its finger-position diagram. The keys touching your selection on the wheel (the IV and V) are its closest neighbours.
About this tool
About the Interactive Circle of Fifths
The circle of fifths arranges all 12 keys in a ring, each a perfect fifth apart. Moving clockwise adds a sharp; moving counter-clockwise adds a flat. It's the fastest way to see a key's signature, find its relative minor, and know which chords belong together. This interactive version lets you click any key to reveal its scale notes and diatonic chords — with a clickable diagram for each chord.
- 01All 12 major keys and their relative minors on one wheel
- 02Key signature (sharps or flats) for every key
- 03The seven notes of each major and natural minor scale
- 04Diatonic chords with Roman numerals (I ii iii IV V vi vii°)
- 05Clickable chord diagrams for every diatonic chord
- 06Neighbouring keys (IV and V) highlighted as you select
- 07Sharps / flats toggle to respell the enharmonic keys
- 08Key Finder — detect the key of a progression
- 09Chord Progression Generator — build in any key
Questions
Frequently Asked Questions
Related Tools
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