🎹 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.