Chord Progression Builder

Build a Roman-numeral chord progression from a key and see the diatonic chords.

KeyModePreset

Progression (Roman numerals)

Output

I → C maj (C - E - G)
V → G maj (G - B - D)
vi → A min (A - C - E)
IV → F maj (F - A - C)

About this tool

Pick a key and a sequence of Roman numerals (I, ii, V, vi, etc.) to get the actual chord names, scale degrees, and a quick 'common progression' preset. Built around the r/musictheory 'what chords work in G minor' question.

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