Circle of FifthsAn Interactive Map of Every Key and Chord
Click a key and instantly see its key signature, scale notes, all seven chords with Roman numerals and its relative minor – then hear them. Free, right in your browser, no app and no sign-up.
How to use the interactive circle of fifths
The circle of fifths is probably the most useful page in any theory book – and the most intimidating one when it's just a printed diagram. Here it comes alive: every click shows you and plays you what's going on in a key. It's the same approach we take in our piano lessons, where theory is something you hear, not something you memorize:
- Get to know the two rings. The outer ring holds the 12 major keys; the inner ring holds each one's relative minor – Am under C, Em under G, and so on.
- Click a key. You'll see its key signature – how many sharps or flats and exactly which ones – plus the notes of the scale in order.
- Find the chords on the circle. The key's seven chords light up on the circle itself, labeled with Roman numerals: I ii iii IV V vi vii°. Notice they always cluster in the same area.
- Play each chord. Click a chord to hear it, and compare the bright majors, the softer minors and the tense diminished chord.
- Play the scale. The scale button plays it ascending, note by note, so you can sing or play along.
- Play I–V–vi–IV. Pop's most-used progression is ready to play in whatever key you pick. Switch keys and hear the same progression move up or down without changing character.
What every click shows you
- The full key signature. The number and the actual list, in the order they're written on the staff: F♯ C♯ G♯… or B♭ E♭ A♭…
- The relative minor or major. Every key is shown with its partner – exactly the same notes, a different center of gravity.
- Harmony at a glance. The highlighted chords show what takes a textbook a full page to explain: which chords belong to the key and how they sit in relation to each other.
The map behind every jam
Once you get the circle, you instantly see which chords belong to a song and where it can go next, so you can play together without stopping to ask.
How the circle of fifths is built
A perfect fifth is seven semitones – C up to G, G up to D. Start with C at the top and go up a fifth with every clockwise step: C, G, D, A, E, B, F♯, then on through D♭, A♭, E♭, B♭ and F – and you're back at C. Twelve fifths add up to 84 semitones, exactly seven octaves, so in equal temperament (the tuning pianos and guitars use) the circle closes perfectly and passes through all 12 notes.
Counterclockwise, each step is a fifth down – the same as a fourth up (C–F–B♭). And here's what makes the circle a working tool: every clockwise step adds one sharp to the key signature, and every counterclockwise step adds one flat. Neighboring keys differ by a single note, which is why they sound "close".
Key signature chart with relative minors
There are 15 possible key signatures, from 7 sharps to 7 flats. Three pairs are the same key under two names (enharmonic): B and C♭, F♯ and G♭, C♯ and D♭. Here's the whole picture:
| Major | Relative minor | Signature | Which notes |
|---|---|---|---|
| C | Am | 0 | – |
| G | Em | 1♯ | F♯ |
| D | Bm | 2♯ | F♯ C♯ |
| A | F♯m | 3♯ | F♯ C♯ G♯ |
| E | C♯m | 4♯ | F♯ C♯ G♯ D♯ |
| B | G♯m | 5♯ | F♯ C♯ G♯ D♯ A♯ |
| F♯ | D♯m | 6♯ | F♯ C♯ G♯ D♯ A♯ E♯ |
| C♯ | A♯m | 7♯ | F♯ C♯ G♯ D♯ A♯ E♯ B♯ |
| F | Dm | 1♭ | B♭ |
| B♭ | Gm | 2♭ | B♭ E♭ |
| E♭ | Cm | 3♭ | B♭ E♭ A♭ |
| A♭ | Fm | 4♭ | B♭ E♭ A♭ D♭ |
| D♭ | B♭m | 5♭ | B♭ E♭ A♭ D♭ G♭ |
| G♭ | E♭m | 6♭ | B♭ E♭ A♭ D♭ G♭ C♭ |
| C♭ | A♭m | 7♭ | B♭ E♭ A♭ D♭ G♭ C♭ F♭ |
Two shortcuts for reading key signatures
- Sharp keys: a half step above the last sharp. The last sharp is the leading tone, the 7th degree. Four sharps ending on D♯ – you're in E major.
- Flat keys: the second-to-last flat. Three flats (B♭ E♭ A♭) – the second-to-last is E♭, and that's the key. The one exception is F major, with a single flat.
The order of sharps, F C G D A E B, is itself a slice of the circle, rising in fifths. The order of flats is the same sequence backwards: B E A D G C F. If a staff full of accidentals still slows you down, our guide on how to learn to read sheet music breaks it into five steps.
Diatonic chords and Roman numerals
Build a chord on each degree of the scale by stacking thirds using only notes from the key, and you get seven chords with the same pattern in every major key: three major, three minor and one diminished. Roman numerals describe the function instead of the name – uppercase for major, lowercase for minor, ° for diminished:
| Degree | Quality | In C major | In G major |
|---|---|---|---|
| I | Major – tonic | C | G |
| ii | Minor | Dm | Am |
| iii | Minor | Em | Bm |
| IV | Major – subdominant | F | C |
| V | Major – dominant | G | D |
| vi | Minor – relative minor | Am | Em |
| vii° | Diminished | B° | F♯° |
Now the magic: I, IV and V are three adjacent slots on the outer ring (F–C–G), and ii, vi and iii are the three minors right beneath them (Dm–Am–Em). The seventh chord, B°, sits one step further on, next to Em. Seven chords become one "slice" of the circle – rotate the slice and you have any other key. For how to voice these chords on the keys, including inversions that connect them with minimal movement, see piano chords made simple.
What about minor keys?
A relative minor uses the same seven chords, just from a different starting point. In A natural minor they're i ii° III iv v VI VII: Am, B°, C, Dm, Em, F, G. In practice, most music in minor raises the 7th degree (G♯ – the harmonic minor) to get a major dominant, E or E7, which pulls back to Am much more strongly.
Using the circle: songwriting, key changes and improvising
Songwriting: one slice of the circle
When you're writing and hunting for the next chord, the answer is almost always inside the key's slice. These are the progressions worth knowing by heart, shown here in C:
- I–V–vi–IV (C–G–Am–F). The progression behind The Beatles' "Let It Be", Adele's "Someone Like You" and Journey's "Don't Stop Believin'" – each in a different key, same numerals.
- vi–IV–I–V (Am–F–C–G). The same four chords starting on the minor, so it sounds darker and more dramatic. The Cranberries' "Zombie" runs on it, in G.
- ii–V–I (Dm–G–C). Two counterclockwise steps home to the tonic – the engine of most jazz, and as Dm7–G7–Cmaj7 the backbone of a lot of neo-soul and R&B.
- I–♭VII–IV (C–B♭–F). B♭ is borrowed from outside the key – one step past IV, counterclockwise – and that's the sound of classic rock: the "Hey Jude" outro, the verse of "Sweet Child O' Mine".
Writing your first song? Start from one of these and build a melody and structure on top – exactly what we walk through in how to write your first song. Want more ideas? Our chord progression generator lays out dozens of progressions by style, in any key.
Key changes: where it's easiest to go
A key's closely related keys are its neighbors on the circle, plus their relative minors. For C major that's G, F, Am, Em and Dm. Moving there feels smooth because most of the chords are shared. The classic method is a pivot chord – one that belongs to both keys: Am is vi in C and also ii in G. Play C–Am, continue to D7 (the dominant of G) and land on G, and the modulation happens without anyone feeling a bump.
The opposite is the "truck driver's modulation": shifting the whole song up a half step for the last chorus, as in Michael Jackson's "Man in the Mirror" (G to A♭). G and A♭ are five steps apart on the circle with almost no notes in common – which is why it lands as a jolt of energy rather than a smooth move. Both are legitimate; the circle tells you in advance which one you're choosing.
Improvising: which notes work
- Seven adjacent slots = a major scale. F C G D A E B are exactly the notes of C major. Any seven neighboring slots on the circle form a major scale.
- Five adjacent slots = a pentatonic. C G D A E are C D E G A – the C major pentatonic, which is also A minor pentatonic. That's why this scale "can't miss" over a progression in the key.
- Relative major and minor share notes. Over a progression in C you can solo with A minor pentatonic. What changes is where you land: C feels like home, A adds a minor color.
Common mistakes
- Knowing "how many" but not "which". It isn't enough to know A major has three sharps – you need to know they're F♯, C♯ and G♯. The order of sharps solves this every time.
- Naming the key from the signature alone. One sharp could be G major or E minor. Check which chord the song resolves to and where the melody feels at home.
- Forgetting the diminished chord. vii° is a real chord in the key. It shows up less in pop, but when it does it almost always leads to I.
- Thinking guitarists don't need this. They need it most: the keys that suit open chords – C, G, D, A and E – sit in a row on the circle, which explains why so many songs are written in them. Students in our guitar lessons who understand the circle find capo positions, chord changes and solos much faster, and our guitar chord chart shows how to play every chord the circle highlights.
Circle of fifths FAQ
What is the circle of fifths, and why is it called that?
It's an arrangement of the 12 keys in which each key is a perfect fifth (seven semitones) above the one before it, going clockwise: C, G, D, A and so on. After 12 fifths you're back at C, hence the circle. Each clockwise step adds a sharp to the key signature, and each counterclockwise step adds a flat.
How do I remember the order of sharps and flats?
Sharps go F C G D A E B, and flats are the same sequence reversed: B E A D G C F. A common mnemonic is "Father Charles Goes Down And Ends Battle". In a sharp key, the key is a half step above the last sharp; in a flat key, the key is the second-to-last flat (except F major, which has one flat).
How do I find the relative minor of a key?
Go down three semitones from the major key's tonic, or count to the 6th degree of the scale: the relative minor of C is A minor, and of E♭ it's C minor. On the circle it sits on the inner ring, right under the major key. Both share the same notes and the same key signature.
Why are F♯ major and G♭ major the same key?
They sound exactly the same – the same pitches under different names (enharmonic). F♯ major is written with six sharps and G♭ major with six flats. In the same way, B major (5 sharps) equals C♭ major (7 flats), and C♯ major (7 sharps) equals D♭ major (5 flats). Musicians usually pick the spelling with fewer accidentals.
How does the circle of fifths help with songwriting?
It shows at a glance which chords belong to a key: three adjacent majors (IV, I, V), the three minors beneath them (ii, vi, iii) and one diminished chord. Most pop and rock songs are built from that group. It also shows which keys you can move to smoothly mid-song – the close neighbors – and which key changes will sound dramatic.
Where can I learn piano and music theory in North Tel Aviv?
Rockstar music school is in Ramat Aviv Gimel, a short drive from Neve Avivim, Afeka, Tel Baruch, Ramat HaHayal and Shikun Dan. We offer piano lessons in North Tel Aviv that weave theory, harmony and songwriting into the songs themselves – at the school, or at your place with Rockstar Home, subject to teacher availability.
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The circle gives you the map. A teacher helps you travel it: recognizing keys by ear, building progressions for your own songs and improvising with confidence. Come for a free, no-commitment intro lesson at our music school in Ramat Aviv Gimel, North Tel Aviv.
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