1. What is an Augmented Sixth Chord?

An augmented sixth chord is a chromatic chord that contains the interval of an augmented sixth. It typically resolves outward to an octave and is used as a predominant harmony in classical music.

2. How Does the Calculator Work?

The calculator uses the Italian augmented sixth chord formula:

Where:

• Root — The base note of the chord
• +6 semitones — The augmented sixth interval
• +8 semitones — The octave (doubled root in Italian sixth)
• +10 semitones — The major third above the root

Explanation: The Italian augmented sixth chord consists of an augmented sixth between the root and sixth scale degree, plus the octave and major third.

3. Types of Augmented Sixth Chords

Details: There are three main types: Italian (root, augmented 6th, and octave), French (adds a perfect 4th), and German (adds a perfect 5th). This calculator shows the Italian version.

4. Using the Calculator

Tips: Simply select the root note from the dropdown menu and click "Calculate" to see the notes of the Italian augmented sixth chord built on that root.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Italian, French, and German augmented sixth chords?
A: Italian has 3 notes (root, aug6, octave), French adds a perfect 4th (4 notes total), German adds a perfect 5th (4 notes total).

Q2: How do augmented sixth chords resolve?
A: Typically, the augmented sixth interval resolves outward to an octave, often to the dominant chord.

Q3: Are augmented sixth chords major or minor?
A: They're chromatic chords that don't fit neatly into major/minor classification, though they often occur in minor keys.

Q4: Can I build an augmented sixth chord on any note?
A: Yes, but in practice they're most commonly built on the flattened submediant (b6) in minor keys.

Q5: Why are they called "augmented sixth" chords?
A: Because they contain the interval of an augmented sixth between the root and sixth scale degree.