The Order of Sharps and Flats
Sharps always appear in the same order: F, C, G, D, A, E, B. Flats appear in exactly the reverse: B, E, A, D, G, C, F. The order never changes, in any key, in any piece — which is what makes a key signature readable at a glance instead of something you decode note by note.
Practice it: Key Signature Trainer — name the key from its signature, against the clock.
The order of sharps: F C G D A E B
A key signature with one sharp has F♯. Two sharps means F♯ and C♯. Three means F♯, C♯, G♯ — and so on down the list. You never get C♯ without F♯, and the sharps are always printed in this order, at these staff positions:
The order of flats: B E A D G C F
Flats run the same list backwards. One flat is B♭, two is B♭ and E♭, three adds A♭. Helpfully, the first four spell a word:
Why the order never changes
It isn't a convention someone picked — it falls out of how keys are built. Each new key a fifth up needs exactly one more sharp, and that sharp is always a fifth above the last one: F→C→G→D→A→E→B is a chain of ascending fifths. Flats work the same way going down a fifth at a time, which is why their order is the exact mirror.
So the order of sharps and flats is the circle of fifths, read off in a line. Learn one and you've learned the other.
Both are the same seven letters at a different spacing — see the musical alphabet and the four ways to read it, where reading in thirds gives you every chord in the key.
Naming the key from the signature
Two rules cover every case:
- Sharps: take the last sharp and go up one step. Last sharp F♯ → the key is G major. Last sharp C♯ → D major.
- Flats: the second-to-last flat names the key. Signature of B♭ and E♭ → B♭ major. The single exception is one flat, which is F major — worth just memorising.
| Sharps | Major key | Flats | Major key |
|---|---|---|---|
| 0 | C | 0 | C |
| 1 — F♯ | G | 1 — B♭ | F |
| 2 — F♯ C♯ | D | 2 — B♭ E♭ | B♭ |
| 3 — +G♯ | A | 3 — +A♭ | E♭ |
| 4 — +D♯ | E | 4 — +D♭ | A♭ |
| 5 — +A♯ | B | 5 — +G♭ | D♭ |
| 6 — +E♯ | F♯ | 6 — +C♭ | G♭ |
| 7 — +B♯ | C♯ | 7 — +F♭ | C♭ |
Every major key shares its signature with a minor key — the relative minor, a third below. One sharp is G major or E minor; the signature alone can't tell you which, only the music can.
Reading it, rather than counting it
Counting sharps mid-piece is too slow to play from, and it's the wrong habit anyway. What actually matters while sight-reading isn't the key's name — it's which notes are altered. Four sharps is more usefully held as "F, C, G and D are all sharp" than as "this is E major."
- Read the shape. Key signatures form the same visual patterns every time, so after enough exposure you recognise "three sharps" without counting to three.
- Convert to affected letters immediately. Before playing a note, know which letters are altered — that's the information your hands need.
- Watch for accidentals. A sharp, flat or natural next to a note overrides the key signature, but only for the rest of that measure.
Practise it free
Real Sight Reader drills real repertoire in real keys, so signatures stop being a quiz and start being something you read. Free, in your browser, no account.