Enharmonic notes

Some notes sound the same but are spelled differently. On the piano there is no physical difference between a sharp and a flat — only the tonal context determines the choice of name.

C#sharpDbflat
D#sharpEbflat
F#sharpGbflat
G#sharpAbflat
A#sharpBbflat

C-sharp / D-flat

C# and Db — the same pitch
Db — Used in flat keys: Db major (5 flats), Bb minor.
C# — Used in sharp keys: C# major (7 sharps), A# minor.
C#C# MajorDbDb Major
C#mC# MinorDbmDb Minor
C#dimC# DiminishedDbdimDb Diminished
C#augC# AugmentedDbaugDb Augmented
C#sus4C# Sus4Dbsus4Db Sus4
C#7C# Dominant 7Db7Db Dominant 7
C#maj7C# Major 7Dbmaj7Db Major 7
C#m7C# Minor 7Dbm7Db Minor 7
C#6C# 6thDb6Db 6th
C#m6C# Minor 6Dbm6Db Minor 6

D-sharp / E-flat

D# and Eb — the same pitch
Eb — Used in flat keys: Eb major (3 flats), C minor.
D# — Used in sharp keys: rarely as a tonic, more often as a degree in B major and F# major.
D#D# MajorEbEb Major
D#mD# MinorEbmEb Minor
D#dimD# DiminishedEbdimEb Diminished
D#augD# AugmentedEbaugEb Augmented
D#sus4D# Sus4Ebsus4Eb Sus4
D#7D# Dominant 7Eb7Eb Dominant 7
D#maj7D# Major 7Ebmaj7Eb Major 7
D#m7D# Minor 7Ebm7Eb Minor 7
D#6D# 6thEb6Eb 6th
D#m6D# Minor 6Ebm6Eb Minor 6

F-sharp / G-flat

F# and Gb — the same pitch
Gb — Used in flat keys: Gb major (6 flats), Eb minor.
F# — Used in sharp keys: F# major (6 sharps), D# minor.
F#F# MajorGbGb Major
F#mF# MinorGbmGb Minor
F#dimF# DiminishedGbdimGb Diminished
F#augF# AugmentedGbaugGb Augmented
F#sus4F# Sus4Gbsus4Gb Sus4
F#7F# Dominant 7Gb7Gb Dominant 7
F#maj7F# Major 7Gbmaj7Gb Major 7
F#m7F# Minor 7Gbm7Gb Minor 7
F#6F# 6thGb6Gb 6th
F#m6F# Minor 6Gbm6Gb Minor 6

G-sharp / A-flat

G# and Ab — the same pitch
Ab — Used in flat keys: Ab major (4 flats), F minor.
G# — Used in sharp keys: rarely as a tonic, more often as a degree in E major and B major.
G#G# MajorAbAb Major
G#mG# MinorAbmAb Minor
G#dimG# DiminishedAbdimAb Diminished
G#augG# AugmentedAbaugAb Augmented
G#sus4G# Sus4Absus4Ab Sus4
G#7G# Dominant 7Ab7Ab Dominant 7
G#maj7G# Major 7Abmaj7Ab Major 7
G#m7G# Minor 7Abm7Ab Minor 7
G#6G# 6thAb6Ab 6th
G#m6G# Minor 6Abm6Ab Minor 6

A-sharp / B-flat

A# and Bb — the same pitch
Bb — Used in flat keys: Bb major (2 flats), G minor.
A# — Used in sharp keys: rarely as a tonic, more often as a degree in B major and F# major.
A#A# MajorBbBb Major
A#mA# MinorBbmBb Minor
A#dimA# DiminishedBbdimBb Diminished
A#augA# AugmentedBbaugBb Augmented
A#sus4A# Sus4Bbsus4Bb Sus4
A#7A# Dominant 7Bb7Bb Dominant 7
A#maj7A# Major 7Bbmaj7Bb Major 7
A#m7A# Minor 7Bbm7Bb Minor 7
A#6A# 6thBb6Bb 6th
A#m6A# Minor 6Bbm6Bb Minor 6

What is enharmonic equivalence

In equal temperament, which most modern instruments use, the octave is divided into 12 equal semitones. Each semitone can have two names: one as a sharp (raising the previous note), another as a flat (lowering the next). For example, the pitch between C and D can be called either C-sharp (C#) or D-flat (Db). On the piano, both names refer to the same black key.

The choice between sharp and flat spelling is determined by the key. Sharp keys (G major, D major, A major and beyond) use sharp note names. Flat keys (F major, Bb major, Eb major) use flat names. This rule keeps notation orderly: each staff line represents exactly one note.

For pianists, understanding enharmonics is especially useful when transposing chords, reading sheet music, and communicating with other musicians. For example, if someone says “Db major,” a pianist should understand it is the same chord as C# major. All enharmonic note pairs on this page link to the corresponding chord pages with keyboard highlighting and theory.

Enharmonic equivalence also relates to intervals: an augmented fourth and a diminished fifth are the same sonic distance (the tritone) but different theoretical names. Understanding keys helps you choose the correct chord spelling for a given harmonic context.

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