⭕ Circle of Fifths Calculator
Explore key relationships, chord progressions, and key signatures
Select a key to explore
🎼 Key Signature
🎵 Scale Notes
🔗 Related Keys
Relative
Parallel
Dominant
Subdominant
🎸 Common Chord Progressions
Diatonic Chords
Popular Progressions
⭕ Circle of Fifths Position
• Moving clockwise adds sharps (or removes flats)
• Moving counter-clockwise adds flats (or removes sharps)
• Adjacent keys differ by one accidental
• Opposite keys are tritones apart (6 semitones)
The Circle of Fifths Calculator is an interactive music theory tool that explores key relationships by displaying comprehensive information about any major or minor key, including key signatures, scale notes, and accidentals with visual representations. Users can select any key to instantly see related keys (relative, parallel, dominant, and subdominant), diatonic chord progressions with Roman numeral analysis, and popular chord sequences commonly used in that key. The tool also shows the selected key’s position within the circle of fifths, indicating its direction from C major, adjacent keys, and tritone relationships, making it perfect for composers understanding key modulation, students learning music theory, or musicians exploring harmonic relationships.