Free Circle of Fifths
This is an interactive circle of fifths from The Ultimate Piano, a browser-based piano practice tool. The wheel maps all 12 keys, their key signatures, and their diatonic chords. Click any major or minor key to see its seven diatonic chords, read its key signature, and hear the chord played. Use it right here — no download, no signup needed.
Click a Key
Pick any segment on the wheel. Minor keys sit on the inner ring, each major key directly outside its relative minor. The outer ring shows every key signature on a small staff — the sharps or flats as they appear in sheet music.
Read the Diatonic Chords
The moment you select a key, the chord bar below shows all seven diatonic chords — with their correct chord names, for G major G, Am, Bm, C, D, Em, F♯dim. A ring around the wheel adds each chord’s Roman numeral and function, such as I · tonic or V · dominant. These are the chords that naturally sound good together in that key.
Hear It
After selecting a key, press the ▶ button in the center of the wheel to hear the key's triad played with piano sound — a major triad for major keys, a minor triad for minor keys.
Spin a Random Key
Press the 🎲 button to spin to a random key. It's a simple way to rotate through all 12 keys when you're practicing scales, chords, or sight-reading in every key.
View the full Circle of Fifths documentation →
An Interactive Circle of Fifths Chart
Most circle of fifths charts are just a picture. This one is clickable — select a key and the whole wheel responds, highlighting the key, its relative major or minor, and its diatonic chords. You learn by exploring, not by squinting at a diagram.
Circle of Fifths Chords, Instantly
Click any key and its seven chords appear immediately — with Roman numerals (I–vii°), the correct enharmonic spelling, and a color that matches the key system. The fastest way to answer “what chords are in the key of…?”
Hear Every Key
A play button in the center of the wheel plays the triad of the selected key with real piano sound. Seeing the theory is one thing — hearing how a key sounds connects it to your ear.
A Circle of Fifths With Key Signatures
The outer ring shows the key signature of every key — the sharps or flats on a small staff, exactly as written in sheet music. Read how many accidentals a key uses without having to memorize it.
Major & Relative Minor
Every major key sits directly outside its relative minor on the inner ring — C major above A minor, both sharing the same key signature. The relationship between major and minor keys becomes visual and obvious.
Enharmonic Spellings
Keys with two valid names (F♯/G♭, D♭/C♯, B/C♭) show both spellings inside the segment. Click the one you want — the key signature updates to match (e.g. 6 sharps vs. 6 flats).
Random Key Practice
The dice button spins to a random key — a quick, gamified way to drill scales, chords, or reading across all 12 keys instead of always defaulting to C.
A Free Circle of Fifths, on Any Device
Phone, tablet, laptop, desktop — no app download, no installation. The interactive circle of fifths runs in any modern browser. No ads, no pop-ups, no account walls.
The Map of Western Harmony
The circle of fifths arranges all 12 keys so each neighbor is a perfect fifth apart and shares six of seven scale notes. The circle of fifths is the single most practical reference for understanding how keys relate.
Find Chords That Work Together
Writing a song or a progression? Click your key and you instantly have its seven diatonic chords. Any combination of them sounds coherent — a ready-made palette for chord progressions.
Learn Key Signatures Faster
Adjacent keys differ by exactly one sharp or flat. Following the wheel clockwise adds sharps, counter-clockwise adds flats — seeing that pattern makes key signatures click far faster than rote memorization.
Interactive Circle of Fifths — FAQ
Is the Free Circle of Fifths really free?
How do I find the chords in a key with the circle of fifths?
Does it show minor keys and key signatures?
Can I hear what a key sounds like?
What's the difference between the major and minor rings?
Does it work on my phone?
The same wheel powers the full app
This circle of fifths is one of the tools in The Ultimate Piano — your piano practice partner, in the browser: chord progressions, a chord explorer, ear training, a diagram generator, and more.
Open the full app →