The minor 7th chord formula is 1–♭3–5–♭7. Starting from any root note, combine a minor third, perfect fifth, and minor seventh to create the chord. For example, C minor 7 contains C, E♭, G, and B♭.
Minor seventh chords are often written as Cm7, Cmin7, or C−7. They combine the darker quality of a minor triad with a softer, less final sound than a plain minor chord. If the basic triad is unfamiliar, reviewing the minor chord formula will make the added seventh easier to understand.
What Is the Minor 7th Chord Formula?
The minor 7th chord formula is 1–♭3–5–♭7, measured from the root of a major scale. In semitones, the same formula is 0–3–7–10. These four positions produce the root, minor third, perfect fifth, and minor seventh.
Interval structure
Each chord tone has a specific job:
- 1 is the root and gives the chord its letter name.
- ♭3 is three semitones above the root and creates the minor quality.
- 5 is seven semitones above the root and stabilizes the chord.
- ♭7 is ten semitones above the root and gives the chord its seventh-chord color.
The ♭ symbol in a formula means “one semitone lower than the corresponding major-scale degree.” It doesn’t mean every chord must contain a note written with a flat. In Am7, for example, the seventh is G natural because the seventh degree of A major is G♯, and lowering G♯ by one semitone gives G.
Understanding the minor third interval is especially useful because the ♭3 is what separates a minor 7th chord from a dominant 7th chord.
Semitone pattern
From the root, count 0, 3, 7, and 10 semitones. You can also examine the distances between adjacent chord tones: 3 semitones, 4 semitones, then 3 semitones. This stacked pattern may be written as minor third + major third + minor third.
The formula and semitone pattern describe the same structure from two perspectives. Scale-degree formulas are better for correct note spelling, while semitone counting is convenient on a fretboard or keyboard.
How Do You Build a Minor 7th Chord?
Build a minor 7th chord by forming a minor triad and adding a note a minor seventh above the root. A reliable method is to write the root, third, fifth, and seventh letter names first, then adjust the third and seventh to match 1–♭3–5–♭7.
Step-by-step method
- Choose the root note.
- Write every other letter name to establish the root, third, fifth, and seventh.
- Lower the third by one semitone from the major scale.
- Keep the perfect fifth.
- Lower the seventh by one semitone from the major scale.
- Check the result against the semitone distances 0–3–7–10.
For Cm7, start with the letter sequence C–E–G–B. The C major scale gives C–E–G–B for degrees 1–3–5–7. Lower E to E♭ and B to B♭, producing C–E♭–G–B♭.
This process is simply a minor triad plus a minor seventh above its root.
More worked examples
For Am7, the required letters are A–C–E–G. Relative to A major, C♯ becomes C and G♯ becomes G, so the final chord is A–C–E–G.
For F♯m7, begin with F♯–A♯–C♯–E♯ from the F♯ major scale. Lower the third and seventh to get F♯–A–C♯–E. The result uses no flat symbols even though its formula contains ♭3 and ♭7.
Correct letter spelling matters because a seventh chord should contain four alternating letter names. Writing F♯–A–C♯–F♭ would reproduce the pitch E on an equal-tempered instrument, but it would mislabel the chord’s seventh and obscure its structure.
What Notes Are in Every Minor 7th Chord?
The following table applies 1–♭3–5–♭7 to 12 commonly used root notes. Enharmonic equivalents can create additional spellings, but these forms are practical for most chord charts and theory exercises.
| Chord | Root | ♭3 | 5 | ♭7 | Notes |
|---|---|---|---|---|---|
| Cm7 | C | E♭ | G | B♭ | C–E♭–G–B♭ |
| C♯m7 | C♯ | E | G♯ | B | C♯–E–G♯–B |
| Dm7 | D | F | A | C | D–F–A–C |
| E♭m7 | E♭ | G♭ | B♭ | D♭ | E♭–G♭–B♭–D♭ |
| Em7 | E | G | B | D | E–G–B–D |
| Fm7 | F | A♭ | C | E♭ | F–A♭–C–E♭ |
| F♯m7 | F♯ | A | C♯ | E | F♯–A–C♯–E |
| Gm7 | G | B♭ | D | F | G–B♭–D–F |
| A♭m7 | A♭ | C♭ | E♭ | G♭ | A♭–C♭–E♭–G♭ |
| Am7 | A | C | E | G | A–C–E–G |
| B♭m7 | B♭ | D♭ | F | A♭ | B♭–D♭–F–A♭ |
| Bm7 | B | D | F♯ | A | B–D–F♯–A |
Notice that A♭m7 contains C♭ rather than B. Although those notes sound at the same pitch in equal temperament, C♭ is the correctly named third above A♭. Preserving letter order makes the chord formula visible.
On guitar, the same four chord tones can appear more than once or in a different order. A voicing remains a minor 7th chord as long as its pitch content and harmonic context support the same root and quality. The guitar chord construction guide explains how formulas translate into playable shapes.
How Does a Minor 7th Chord Compare With Other Seventh Chords?
A minor 7th chord has both a lowered third and lowered seventh. Changing either note creates a different seventh-chord quality, even when the root and fifth remain unchanged.
| Chord quality | Formula | C-root example | Defining difference |
| Major 7th | 1–3–5–7 | C–E–G–B | Major third and major seventh |
| Dominant 7th | 1–3–5–♭7 | C–E–G–B♭ | Major third and minor seventh |
| Minor 7th | 1–♭3–5–♭7 | C–E♭–G–B♭ | Minor third and minor seventh |
| Minor-major 7th | 1–♭3–5–7 | C–E♭–G–B | Minor third and major seventh |
| Half-diminished 7th | 1–♭3–♭5–♭7 | C–E♭–G♭–B♭ | Lowered third, fifth, and seventh |
Cm7 and C7 differ by only one pitch: Cm7 has E♭, while C7 has E. That one-semitone change alters both the chord symbol and its usual harmonic function. Compare the structure with the dominant seventh formula and the major seventh formula to avoid treating every “7” chord as the same quality.
Where Are Minor 7th Chords Used?
Minor 7th chords occur naturally on the ii, iii, and vi degrees of a major key. In C major, those chords are Dm7, Em7, and Am7. Their scale-degree functions are ii7, iii7, and vi7.
The ii–V–I progression
One of the clearest uses is the ii–V–I progression. In C major, Dm7 moves to G7 and then Cmaj7:
Dm7: D–F–A–C
G7: G–B–D–F
Cmaj7: C–E–G–B
The notes C and F in Dm7 move smoothly into notes of G7, and the dominant chord then resolves toward Cmaj7. This voice leading helps explain why the minor 7th chord is so common as a predominant chord before V.
Other harmonic roles
A minor 7th chord can also act as iii7 or vi7, extend a minor tonic, or appear through modal interchange and chromatic harmony. Its function depends on the key and surrounding chords rather than its symbol alone.
For a broader view of where each seventh chord arises, see the explanation of chords in a major key. On an instrument, you can rearrange the four notes into inversions without changing the underlying chord quality, though the bass note and voice leading will change.
Frequently Asked Questions
What notes are in a minor 7th chord?
A minor 7th chord contains a root, minor third, perfect fifth, and minor seventh. Apply 1–♭3–5–♭7 to the chosen root; for example, Dm7 contains D–F–A–C.
Why does a minor 7th chord have both a ♭3 and ♭7?
The ♭3 creates the minor triad, while the ♭7 adds a minor seventh above the root. “Minor” in the chord name describes the triad quality, and “7” conventionally indicates a minor seventh unless the symbol specifies a major seventh.
What is the difference between Cm7 and C7?
Cm7 is C–E♭–G–B♭ and follows 1–♭3–5–♭7. C7 is C–E–G–B♭ and follows 1–3–5–♭7, so the third is the only different chord tone.
Is a minor 7th chord the same as a minor-major 7th chord?
No. A minor 7th chord uses 1–♭3–5–♭7, while a minor-major 7th chord uses 1–♭3–5–7. In C, that difference is B♭ in Cm7 versus B natural in Cm(maj7).
Which scale degrees produce minor 7th chords in a major key?
The ii, iii, and vi scale degrees produce minor 7th chords when seventh chords are built only from notes of a major scale. In C major, the results are Dm7, Em7, and Am7.
Liam Turner is a guitar theory writer and chord analysis specialist at Chord Calculator. He focuses on chord construction, music theory, scale relationships, harmony tools, and guitar learning resources for musicians, producers, songwriters, and beginners. Liam creates practical, easy-to-follow content around chord progressions, interval formulas, key analysis, and interactive music tools to help users better understand harmony, songwriting, and instrument practice.