3 Sharps Key Signature: Which Keys Have Three Sharps?
A 3 sharps key signature means A major or its relative minor, F sharp minor. The three sharps are F sharp, C sharp and G sharp, always in that order. The two keys share the identical three signs, so the ending note decides which you are in. Below: the three sharps drawn and labelled, the scale notes for both keys, and the pitches you can check.
What 3 sharps key means
A major and its relative F sharp minor are written with three sharps: F sharp, C sharp, G sharp. These three sharps are printed once after the clef and hold for the whole line unless an accidental cancels one of them.
| Question | Major key | Relative minor |
|---|---|---|
| Key name | A major | F sharp minor |
| Sharps or flats | three sharps: F sharp, C sharp, G sharp | three sharps: F sharp, C sharp, G sharp |
| Tonic pitch | A major: 440.00 Hz | F sharp minor: 369.99 Hz |
| How they are written | Sharps are added in the fixed order F, C, G, D, A, E, B, so a three-sharp signature stops after the third step, G sharp, and never reaches D sharp. | Sharps are added in the fixed order F, C, G, D, A, E, B, so a three-sharp signature stops after the third step, G sharp, and never reaches D sharp. |
| A major | F sharp minor |
|---|---|
| A, B, C sharp, D, E, F sharp, G sharp | F sharp, G sharp, A, B, C sharp, D, E |
How to read this signature
The sharps of every key signature follow a single path: F, C, G, D, A, E, B. Three sharps is just the first three steps of that path, and then it stops, at G sharp.
Sharps are added in the fixed order F, C, G, D, A, E, B, so a three-sharp signature stops after the third step, G sharp, and never reaches D sharp.
A major and F sharp minor share the same three sharps, so the printed signs alone never reveal which of the two a piece is in.
Numbers you can check
The three sharps sit at three measurable pitches: the tonic of A major, A 4 = 440.00 Hz (the standard tuning reference), and of F sharp minor, F sharp 4 = 369.99 Hz (equal temperament). Counting the accidentals on this signature gives three — F sharp, C sharp, G sharp.
Equal temperament from A4 = 440 Hz sets any note n semitones above A4 at 440 × 2n/12 Hz; rerun that to verify the two tonic figures above.
Those frequencies are arithmetic. A separate reading of one recording is in the example: on 16 October 2026 the key finder called the opening of Bach’s A major prelude A major at 47% confidence.
A recorded example you can check
Wikipedia’s The Well-Tempered Clavier article, read on 16 October 2026, heads Book 1 No. 19 as “Prelude and Fugue in A major, BWV 864”. The Open Well-Tempered Clavier score, MuseScore edition version 1.0 dated 19 March 2015 and marked CC0, prints three sharps — F sharp, C sharp, G sharp — between the clefs and the time signature on the first page of Praeludium 19. That is the same signature as F sharp minor. The recording below is the opening of that prelude. The key name comes from the article; the three sharps are what that page of the score prints.
On 16 October 2026 this site’s key finder read this 20-second clip as A major, Camelot 11B, at 47% confidence, and labelled the reading low confidence. It listed B minor (11%) and E major (11%) as the next two candidates, and the on-screen note says B minor also fits. That percentage is the finder’s estimate for this file, not a measured accuracy rate. The article names the prelude A major, and that is the key the finder returned. F sharp minor shares these three sharps and was not one of the two alternatives on screen.
What our key tools tell you
Feed a recording to the key finder to hear which of the two keys it suggests, or list the chords and let key from chords decide. The signature itself is read from the score.
3 sharps key signature: quick answers
What key has 3 sharps?
A major and its relative minor, F sharp minor. Both are written with the same three sharps: F sharp, C sharp and G sharp.
Is 3 sharps A major or F sharp minor?
Both. Three sharps is the shared signature of A major and F sharp minor. The note the music settles on tells you which one.
What are the 3 sharps in order?
F sharp, C sharp and G sharp. Sharps always arrive in the order F, C, G, D, A, E, B, so three sharps is just the first three.
What is the relative minor of A major?
F sharp minor. Relative keys share a key signature, so F sharp minor uses the same F sharp, C sharp and G sharp as A major.
Is 3 sharps the same as a 3 sharp key signature?
Yes — a signature with three sharps in it, which names A major and F sharp minor.
What this page leaves open
- This page covers the printed three-sharp signature; modulating out of it with accidentals is a separate topic.
- The tonic frequencies are computed in equal temperament, not measured from a performance.
- The enharmonic spelling of the same pitches (G flat rather than F sharp) is not treated here.