Piano Chords in Major Keys

Chord Formula for All Major Keys
Major - minor - minor - Major - Major - minor - diminished

Major chord keys are based on the order of the major scale.

Each chord within a key is identified by an assigned roman numeral to identify the chord's position within the key. A major chord in a key is assigned an uppercase roman numeral, and a minor chord with a lowercase roman numeral.

I - ii - iii - IV - V - vi - vii