Relative Key Calculator

Find the relative major or minor key, shared scale notes, key signature, pivot chord, transposed target, and practical modulation relationship for common tonal music.

🎼 Relative Key Presets

Preset use: Load a common major or minor key pair, then adjust spelling preference, pivot degree, seventh-chord color, and modulation shift.

🎹 Key Relationship Inputs

Starting key tonic Choose the written tonic for the source key.

Starting key mode Major points to vi; minor points to III.

Minor color preview Relative keys share the natural minor collection.

Accidental spelling preference Affects extra transposition notes and enharmonic display.

Optional modulation shift (semitones) Shows where the source and relative key move if transposed.

Pivot chord degree in source key Calculates the same chord function in both keys.

Chord detail level Changes pivot chord suffix and comparison labels.

Transition emphasis Summarizes the most useful modulation route.

Relative Key

A minor

vi of C major

Shared Scale Notes

C D E F G A B

7 common pitch classes

Pivot Chord

vi in C, i in A minor

Key Signature

same signature in both keys

Calculation Breakdown

📊 Selected Key Spec Grid

Source tonic

down m3

Relative interval

Key signature accidentals

Pivot

Best transition route

📐 Major To Relative Minor Reference

Major Key	Relative Minor	Key Signature	Relative Degree
C major	A minor	0 sharps or flats	vi
G major	E minor	1 sharp	vi
D major	B minor	2 sharps	vi
A major	F# minor	3 sharps	vi
F major	D minor	1 flat	vi
Bb major	G minor	2 flats	vi
Eb major	C minor	3 flats	vi

🎵 Minor To Relative Major Reference

Minor Key	Relative Major	Key Signature	Relative Degree
A minor	C major	0 sharps or flats	III
E minor	G major	1 sharp	III
B minor	D major	2 sharps	III
F# minor	A major	3 sharps	III
D minor	F major	1 flat	III
G minor	Bb major	2 flats	III
C minor	Eb major	3 flats	III

🔀 Pivot Chord Comparison Grid

Shared Chord	In Major Key	In Relative Minor	Typical Use
C	I in C major	III in A minor	Bright arrival before minor color
Dm	ii in C major	iv in A minor	Predominant link into a minor cadence
Em	iii in C major	v in A minor	Soft dominant-area connection
F	IV in C major	VI in A minor	Common pop and modal mixture bridge
G	V in C major	VII in A minor	Dominant in major, modal lift in minor
Am	vi in C major	i in A minor	Direct relative-minor arrival chord
Bdim	viio in C major	iio in A minor	Tense passing sonority

🔑 Key Signature Comparison

Signature	Major Key	Relative Minor	Useful Check
0	C	A minor	No printed accidentals in the signature
1 sharp	G	E minor	F# appears in both key signatures
2 sharps	D	B minor	F# and C# are shared
1 flat	F	D minor	Bb appears in both key signatures
2 flats	Bb	G minor	Bb and Eb are shared
4 sharps	E	C# minor	G# minor leading tone is extra only in harmonic minor

Pivot tip: A relative key shares the same written key signature, so the cleanest modulation often uses a chord that already belongs to both collections.

Minor tip: Natural minor shares all seven notes with its relative major. Harmonic and melodic minor add color tones that should be treated as accidentals.

A composer often want to move from one key to another. However, a composer dont want teh music to sounding like it belongs to a different piece of music. One of the method composers use to move to a different key while maintaining the same sound is by using relative keys.

A relative key share the same key signature and use the same notes as the original piece of music. Additionally, when a composer use relative keys, it creates a shift in gravity in the music for the listener while the music maintains the same tonal material. A relative key calculator can help composers find these keys quick so they can test the musical transition in mere second.

How to Change Key Using Relative Keys

The relative keys shares a