Guitar chords and their construction
Guitar chords as well as piano chords can be easily figured out by using this handy chart that shows the scale step numbers measured from the Root. For example if I’m in the key of C Major then all the component part of a chord are measured from the C Major Scale. Here is a handy chord chart to help determine the chord tones within the five families of chords. The five families of chords are: Major, minor, dominant, Augmented, diminished.
| CHORD | Scale Step numbers measured from root |
| C major | 1,3,5 |
| C6 | 1,3,5,6 |
| C6/9 | 1,3,5,6,9 |
| C Major7 6/9 | 1,3,5,6,7,9 |
| C Major 7 | 1,3,5,7 |
| C Major 9 | 1,3,5,7,9 |
| C minor | 1,b3,5 |
| Cm6 | 1,b3,5,6 |
| C m 6/9 | 1,b35,6,9 |
| C m7 | 1,b3,5,b7 |
| Cm7 sus4 | 1,b3,4,b7 |
| C m9 | 1,b3,5,b7,9 |
| Cm11 | 1,b3,5,b7,9,11 |
| Cm13 | 1,b3,5,b7,9,11,13 |
| C7 | 1,3,5,b7 |
| C7 sus4 | 1,4,5,b7 |
| C9 | 1,3,5,b7,9 |
| C11 | 1,3,5,b7,9,11 |
| C13 | 1,3,5,b7,9,11,13 |
| C Aug. | 1,3,#5 |
| C diminished | C,b3,b5,bb7 or (6) |
All of the notes do not have to be included in the chords the most important chord tones are the 3 and 7 (in whatever family). Note: the 9th is the 2nd step of a scale, the 11th is the 4th step of a scale and the 13th is the 6th step of a scale. If you are playing the chord extensions you can add just the one extension you need for each family. Remember this is good for piano chords as well as guitar chords.


