Interactive Tool

Interactive Circle of Fifths

Click any key to explore its diatonic chords, key signature, relative minor, and scale notes. The universal map of musical relationships — interactive and free.

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Understanding the Circle of Fifths

The circle of fifths is the single most useful diagram in Western music theory. It organizes all 12 major keys (and their relative minor keys) into a circular pattern where adjacent keys share six out of seven notes in common. This close relationship explains why modulating between neighboring keys sounds smooth and natural, while jumping across the circle creates dramatic harmonic contrast.

Moving clockwise from C major: each new key adds one sharp (G→1♯, D→2♯, A→3♯, E→4♯, B→5♯, F♯→6♯, C♯→7♯). Moving counterclockwise: each key adds one flat (F→1♭, B♭→2♭, E♭→3♭, A♭→4♭, D♭→5♭, G♭→6♭, C♭→7♭). The inside ring shows the relative minor for each major key — the minor key that shares the same key signature.

Click any key on the circle above to see its key signature, relative minor, parallel minor, the seven diatonic chords (with Roman numeral analysis), and the complete set of notes in that key. Use the Play Scale button to hear the scale played back on a piano sound.

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Circle of Fifths — Frequently Asked Questions

Find answers to common questions about our virtual instruments, practice tools, and music theory workspace.

What is the circle of fifths used for?

The circle of fifths is a fundamental music theory diagram that shows the relationship between all 12 major and minor keys.

Musicians use it to understand key signatures, find related keys for modulation, figure out which chords naturally belong to a key, and understand why certain chord progressions sound harmonically pleasing.

How many sharps or flats does each key have?

Keys are arranged in the circle so that each step clockwise adds one sharp, and each step counterclockwise adds one flat.

C major has no sharps or flats, G major has 1 sharp, D major has 2 sharps, while F major has 1 flat, Bb major has 2 flats, and so on up to 7 sharps (C# major) or 7 flats (Cb major).

What is a relative minor key?

Every major key has a relative minor key that shares the same key signature (same notes and sharps/flats).

The relative minor starts 3 semitones below the major key. For example, A minor is the relative minor of C major — both use no sharps or flats.

What are the diatonic chords of a key?

Diatonic chords are the 7 chords that naturally occur within a key using only that key's notes.

In C major, they are C, Dm, Em, F, G, Am, and Bdim. These chords all sound naturally harmonious when played together.

What does a key signature tell you?

A key signature tells you which notes are consistently sharp or flat throughout a piece.

It appears at the beginning of sheet music after the clef, saving you from writing a sharp or flat before every affected note.

How is the circle of fifths arranged?

Starting at the top with C major (no sharps or flats), each step clockwise adds one sharp (G→D→A→E→B→F#→C#), while each step counterclockwise adds one flat (F→Bb→Eb→Ab→Db→Gb→Cb).

Related minor keys appear inside the circle.

What is a parallel minor?

A parallel minor shares the same root note as its major counterpart but has a different key signature.

For example, C major and C minor are parallel keys — C major has no sharps/flats, while C minor has three flats (Bb, Eb, Ab).

How do I use the circle of fifths for songwriting?

The circle helps you find chords that naturally work together.

Adjacent keys share most of their notes, so modulating between them sounds smooth. The circle also shows common chord progressions — for example, moving clockwise around the circle gives you the classic I-IV-V-I progression.

What is the difference between the circle of fifths and the chromatic circle?

The circle of fifths organizes keys by perfect fifth intervals (7 semitones), showing harmonic relationships.

The chromatic circle organizes all 12 notes by semitones. The circle of fifths is far more useful for understanding key signatures and chord relationships.

Can I click the keys on this circle of fifths?

Yes! Click any key on the interactive circle above to see its key signature, relative minor, parallel minor, diatonic chords with Roman numerals, and scale notes.

Click the Play Scale button to hear the notes played back.