🎹 Chord & Scale Finder
Pick a root and a chord or scale to see its notes on a keyboard — or tap the notes you're playing and let the tool name the chord.
C
Chords and scales are built from fixed semitone formulas (e.g. major = root, +4, +7). "Identify" matches your exact set of notes to a chord regardless of octave or inversion — symmetric shapes like the diminished 7th return several enharmonic names. Equal-tempered, spelled with sharps or flats. 🔒 In your browser.
How the chord & scale finder works
Every chord and scale is a fixed pattern of semitone steps from a root: a major triad is the root plus 4 and 7 semitones, a major scale is 0-2-4-5-7-9-11. In "Build" mode you choose a root and a chord or scale and the tool lays out the notes (spelled with sharps or flats) and lights them on a one-octave keyboard. In "Identify" mode you tap the notes you have and it matches your exact set — regardless of octave or inversion — to every named chord that fits.
Because a set of pitch classes can belong to more than one chord, symmetric shapes return several names: a diminished 7th (every note three semitones apart) is spelled four ways, one from each of its notes. The spellings are equal-tempered and enharmonic (A♯ = B♭) — the tool doesn't pick a key-correct spelling, just the pitches.
Frequently asked questions
What notes are in a C major chord?
C, E and G — the root plus the notes 4 and 7 semitones above it. A major triad is always root, major third and perfect fifth; the tool builds it for any root you pick.
How do I find the notes of a scale?
Apply the scale's semitone formula to the root. A major scale is 0-2-4-5-7-9-11 semitones, so C major is C D E F G A B; G major (same pattern from G) is G A B C D E F♯. Choose the root and scale and the tool spells it out.
How do I identify a chord from its notes?
Switch to "Identify", tap the notes you're playing, and the tool matches that exact set of pitch classes to every named chord that fits — ignoring octave and inversion. Tap C, E and G and it returns C major.
Why does one set of notes match several chords?
Some chords are symmetric, so the same pitches spell more than one chord. The diminished 7th stacks minor thirds evenly, so C-E♭-G♭-A is also E♭, G♭ and A diminished 7th — the tool lists all the valid names.
What is the difference between a chord and a scale here?
A chord is a small set of notes played together (usually 3–5); a scale is the ordered set of 5–12 notes a melody or key draws from. Both are built from semitone formulas — the tool covers common chords and scales/modes.
Does it spell chords in the correct key?
No — it gives the correct pitches but a single enharmonic spelling (choosing sharps or flats by your toggle), not a key-signature-aware spelling. So it may show A♯ where a score in the key would write B♭; the sounding notes are identical.