An augmented triad is a three-note chord created by raising the fifth note of a major triad by one semitone. It has a bright but unstable sound because the distance between its notes creates tension that often feels like it wants to resolve to another chord.
For example:
C major triad:
C – E – G
Raise the fifth note (G) by one semitone:
C – E – G♯
The result is:
C augmented (C+)
Augmented triads are less common than major and minor chords, but they are valuable tools for creating tension, movement, and unique harmonic colors in music.
What Is an Augmented Triad?
A triad is a three-note chord built from:
- Root
- Third
- Fifth
An augmented triad follows the formula:
1 – 3 – ♯5
This means:
- 1 = root note
- 3 = major third
- ♯5 = raised fifth
For example, a C augmented triad contains:
- C = root
- E = major third
- G♯ = augmented fifth
The difference between a major triad and an augmented triad is only one note:
C major:
C – E – G
C augmented:
C – E – G♯
The fifth has been raised by one semitone, changing the entire character of the chord.
Understanding how these note relationships work is the foundation of chord construction. You can learn more about chord formation in this guide on how chords are built.
How Augmented Triads Are Built
Start With a Major Triad
Every augmented triad begins as a major triad.
A major triad formula is:
1 – 3 – 5
Example:
C major:
- C = root
- E = major third
- G = perfect fifth
Result:
C – E – G
Raise the Fifth Note
The next step is to raise the fifth by one semitone.
G becomes:
G♯
Now the notes are:
C – E – G♯
This creates the augmented triad.
Apply the Formula
The universal augmented triad formula is:
1 – 3 – ♯5
This formula works in every key.
Examples:
- C augmented = C – E – G♯
- D augmented = D – F♯ – A♯
- F augmented = F – A – C♯
The root changes, but the interval pattern remains the same.
Augmented Triad Examples
| Chord | Major Triad | Augmented Triad |
|---|---|---|
| C | C – E – G | C – E – G♯ |
| F | F – A – C | F – A – C♯ |
| G | G – B – D | G – B – D♯ |
| A | A – C♯ – E | A – C♯ – E♯ |
In every case, only the fifth note is raised.
Augmented vs Major vs Diminished Triads
Augmented triads are easier to understand when compared with other basic triad types.
| Triad Type | Formula | Example (C Root) | Sound Character |
|---|---|---|---|
| Major | 1 – 3 – 5 | C – E – G | Stable and bright |
| Augmented | 1 – 3 – ♯5 | C – E – G♯ | Tense and unresolved |
| Diminished | 1 – ♭3 – ♭5 | C – E♭ – G♭ | Dark and unstable |
A major chord and augmented chord are very similar because they share the same root and third. The main difference is the fifth.
A diminished chord changes both the third and fifth, creating a different type of tension.
You can explore other triad structures in this guide about types of triads.
How Augmented Triads Sound and Function
Creating Tension
Augmented triads often create a feeling of uncertainty because the raised fifth makes the chord less stable.
Unlike a major chord, which often feels complete, an augmented chord frequently sounds like it is moving toward another harmony.
Creating Smooth Resolution
Because augmented chords contain tension, composers often use them before a chord that provides resolution.
For example:
C augmented:
C – E – G♯
may resolve to:
A minor:
A – C – E
The movement from G♯ to A creates a strong sense of direction.
Adding Color to Music
Augmented triads appear in many musical styles, including:
- Classical music
- Jazz
- Film music
- Songwriting
- Experimental harmony
They are often used when composers want a sound that feels unusual or emotionally uncertain.
How to Identify an Augmented Triad
You can identify an augmented triad by following these steps:
1. Count the Notes
An augmented triad contains three notes.
Example:
C – E – G♯
2. Find the Root
The root is the note that gives the chord its name.
Example:
C augmented:
Root = C
3. Check the Intervals
An augmented triad must contain:
- Major third above the root
- Augmented fifth above the root
For C:
- C → E = major third
- C → G♯ = augmented fifth
Therefore:
C – E – G♯ is a C augmented triad.
Common Mistakes When Learning Augmented Triads
Confusing Augmented With Major
A common mistake is forgetting that augmented chords are almost the same as major chords.
The difference:
Major:
C – E – G
Augmented:
C – E – G♯
Only the fifth changes.
Forgetting the Raised Fifth
The defining feature of an augmented triad is the raised fifth.
If the fifth is not raised, the chord is not augmented.
Thinking Augmented Means “Larger”
The word “augmented” does not mean the chord simply contains more notes.
It refers specifically to the increased size of the fifth interval.
Augmented Triads and Chord Symbols
Augmented triads are commonly written using symbols such as:
- C+
- Caug
- C augmented
All of these indicate the same basic chord structure.
Understanding chord symbols helps musicians quickly recognize chord types when reading music. You can learn more about this topic in the guide to chord symbols.
Exploring Augmented Triads With Chord Tools
Augmented triads can be easier to understand when you compare different chord structures visually.
A chord calculator can help you explore:
- Different augmented chords
- Note combinations
- Chord relationships
- Alternative keys
Comparing augmented chords with major and diminished chords helps develop a stronger understanding of harmony.
Frequently Asked Questions
What notes are in an augmented triad?
An augmented triad contains a root, major third, and raised fifth. The formula is 1–3–♯5.
How do you make an augmented triad?
Start with a major triad and raise the fifth note by one semitone.
What is the difference between major and augmented chords?
A major chord uses a perfect fifth, while an augmented chord raises the fifth by one semitone.
Why do augmented chords sound unusual?
The raised fifth creates extra tension, making augmented chords sound less stable and more likely to resolve.
Are augmented triads common in songs?
They are less common than major and minor chords, but musicians use them for tension, color, and harmonic movement.
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.