Select any key to see its key signature, which notes are sharp or flat, its relative minor, and the neighbouring keys a fifth away.
Circle of Fifths Reference
Moving clockwise around the circle adds a sharp (up a fifth); counter-clockwise adds a flat (down a fifth / up a fourth). Neighbouring keys share all but one note, which is why the IV and V chords feel so natural to move to.
How it works
The circle arranges the twelve keys by perfect fifths. Each clockwise step adds a sharp; each counter-clockwise step adds a flat. Keys next to each other differ by just one note, which is why moving to the IV (subdominant) or V (dominant) chord sounds so smooth.
FAQ
What is the circle of fifths used for?
Working out key signatures, finding related keys for modulation, and building chord progressions — it’s one of the most useful maps in music theory.
How do I find the relative minor?
It’s the minor key that shares the same key signature — three semitones below the major root (e.g. A minor for C major). The tool shows it for every key.