How to create diatonic chords in E minor scale?
E Minor Scale
E – F♯ – G – A – B – C – D – E are the notes of the E minor scale.

Diatonic chords are formed by stacking two generic third notes above each scale note.

E Minor Diatonic Chords
These are the seven minor scale diatonic chords that come from the E minor scale.

Each diatonic chord is labelled with a roman numeral number.

All natural minor scales follow the same chord quality pattern:
i, iiº, III, iv, v, VI, VII
We use uppercase roman numeral numbers to represent major chords, lowercase to represent minor chords, uppercase with a small plus sign to represent augmented chords, and lowercase with a small circle to represent diminished chords.
1, 4 and 5 chords in natural minor will always be minor chords. 3, 6 and 7 chords in natural minor scale will always be major chords. 2 chord in natural minor scale will always be diminished chord. A different pattern applies to harmonic minor: i iiº III+ iv V VI viiº and melodic minor: i ii III+ IV V viº viiº
There are a total of 13 minor scale diatonic chords that harmonize the E minor scale. (7 in natural minor, 3 in harmonic minor and 3 more in melodic minor)
The seven diatonic chords in the E natural minor key are:
i — E minor chord ( E – G – B )
iiº — F Sharp diminished chord ( F♯ – A – C )
III — G major chord ( G – B – D )
iv — A minor chord ( A – C – E )
v — B minor chord ( B – D – F♯ )
VI — C major chord ( C – E – G )
VII — D major chord ( D – F♯ – A )
The three diatonic chords in the E harmonic minor are:
III+ — G augmented chord ( G – B – D♯ )
V — B major chord ( B – D♯ – F♯ )
viiº — D sharp diminished chord ( D♯ – F♯ – A )
The three diatonic chords in the E melodic minor are:
ii — F Sharp minor chord ( F♯ – A – C♯ )
IV — A major chord ( A – C♯ – E )
viº — C sharp diminished chord ( C♯ – E – G )
Minor Scale Diatonic Chords in Other Keys
Diatonic Chords in C minor key
Diatonic Chords in C sharp minor key
Diatonic Chords in D minor key
Diatonic Chords in D sharp minor key / E flat minor key
Diatonic Chords in E minor key
Diatonic Chords in F minor key
Diatonic Chords in F sharp minor key
Diatonic Chords in G minor key
Diatonic Chords in G sharp minor key / A flat minor key
Diatonic Chords in A minor key
Diatonic Chords in A sharp minor key / B flat minor key
Diatonic Chords in B minor key
Piano Chord Progression Poster
This practical piano chord progression poster from Amazon is a perfect reference chart to all 24 major and minor chord sets — The Really Useful Piano Chord Progression Poster – A1 Size – Folded Version