Chords in G Major — Key Chord Builder
Build the diatonic chords of a selected key and label every degree with its harmonic role.
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The result appears on this page after you run the tool. Nothing you enter is uploaded.
Result
About this tool
This page opens the chord builder with G major already selected and runs it for you — the seven diatonic chords of the key are listed above the moment the page loads.
G major has one sharp, F♯, and is built on the notes G, A, B, C, D, E, F♯. Its chords are G, Am, Bm, C, D, Em and F♯ diminished — a guitar-friendly key where the I, IV and V chords all sit comfortably in open position.
The full tool builds the diatonic chord map for any of the twelve roots in major or minor, labels every degree with its Roman numeral and harmonic role, and runs entirely in your browser.
Example. Selecting C major lists I tonic C major, ii supertonic Dm minor, iii mediant Em minor, IV subdominant F major, V dominant G major, vi submediant Am minor, and vii° leading/subtonic Bdim diminished.
Limit. Only the seven diatonic triads of major or natural minor are built, so seventh chords and modes other than those two never appear.