Interactive Circle of Fifths — Music Theory Tool

The Circle of Fifths is the ultimate map of musical harmony. Click any key on the diagram below to explore its diatonic chords, key signature, common progressions, and a direct link to the scale harmonizer.

What Is the Circle of Fifths?

The Circle of Fifths is a diagram that arranges all 12 keys of Western music in a circular pattern. Moving clockwise, each key is a perfect fifth above the previous one: C, G, D, A, E, B, F#/Gb, Db, Ab, Eb, Bb, F, and back to C. This pattern reflects the most fundamental harmonic relationships in music.

It was first described by the German composer and theorist Johann David Heinichen in 1728, though the concept of fifth-based relationships goes back much further. Today it is one of the most widely taught tools in music theory, used daily by songwriters, arrangers, and musicians across every genre.

How to Read the Circle of Fifths

The outer ring shows all 12 major keys. Going clockwise, each key adds one sharp to its key signature. Going counterclockwise from C, each key adds one flat. The inner ring shows relative minor keys — each one shares the same key signature and the same notes as its corresponding major key on the outer ring.

For example, G Major has one sharp (F#) and its relative minor is E minor — both use exactly the same notes. Click any key on the interactive diagram above to see this relationship in action.

Using the Circle for Songwriting

The Circle of Fifths is a powerful songwriting tool because it reveals which chords naturally sound good together. The diatonic chords — the seven chords built from a scale — form the foundation of most songs. When you click a key above, you will see all seven diatonic chords with their Roman numerals (I, ii, iii, IV, V, vi, vii°).

Adjacent keys on the circle share most of their chords. For example, C Major and G Major share 6 out of 7 chords. This makes modulating between neighboring keys smooth and natural — a technique used in countless hits. Explore the most common chord progressions to see these patterns in action.

Key Signatures: Sharps and Flats

At the top of the circle sits C Major, which has no sharps or flats. Moving clockwise: G has 1 sharp, D has 2, A has 3, E has 4, B has 5, and F#/Gb has 6. Moving counterclockwise: F has 1 flat, Bb has 2, Eb has 3, Ab has 4, Db has 5, and Gb/F# has 6. The order of sharps is always F#, C#, G#, D#, A#, E#, B#. The order of flats is Bb, Eb, Ab, Db, Gb, Cb, Fb.

Relative Major and Minor

Every major key has a relative minor that shares exactly the same notes and key signature. The relative minor sits 3 semitones below the major root. On the circle, relative minors are shown on the inner ring, directly aligned with their corresponding major. This relationship is fundamental to composition: you can shift between the major and its relative minor without changing any notes — only the tonal center shifts.

For example, a song in C Major can shift to A minor for the bridge to create a darker, more emotional feel, using exactly the same chords. Use the scale harmonizer to explore how the same chords function in both keys.

Modulation and Key Changes

The Circle of Fifths is especially useful for planning modulations — key changes within a song. Keys that are one position apart on the circle (like C to G, or G to D) differ by only one note, making the transition nearly seamless. The farther apart two keys are on the circle, the more dramatic the change. A half-step-up modulation (like E to F) — the classic final chorus lift — spans five positions around the circle.

Pivot chords — chords that exist in both keys — are the key to smooth modulations. Because adjacent keys share many chords, they provide multiple pivot options. Check our chord progressions guide for detailed examples of modulation in famous songs.

Chord Progressions and the Circle

The most-used chord progressions in music follow the patterns of the Circle of Fifths. The V-to-I (dominant-to-tonic) movement is the strongest resolution in harmony, and it directly follows the counterclockwise direction of the circle. The I-IV-V-I progression uses three adjacent keys on the circle. The popular I-V-vi-IV combines circle movement with the relative minor relationship.

Click any key on the interactive diagram above to see its most common progressions, then click the individual chords to see how to play them on guitar. For a full library of 324 progressions in every key, visit our chord progressions tool.