| Main Interval Name: | Augmented third |
| Inverse: | diminished sixth |
| Complement: | diminished sixth |
| Other Names: | - |
| Abbreviation: | A3 |
| Semitones: | 5 |
| Interval Class: | 5 |
| Just Interval: | 125:96,[1] 21:16, 64:49 |
| Cents Equal Temperament: | 500 |
| Cents 24T Equal Temperament: | 500 |
| Cents Just Intonation: | 457 |
In classical music from Western culture, an augmented third is an interval of five semitones. It may be produced by widening a major third by a chromatic semitone.[2] [3] For instance, the interval from C to E is a major third, four semitones wide, and both the intervals from C to E, and from C to E are augmented thirds, spanning five semitones. Being augmented, it is considered a dissonant interval.[4]
Its inversion is the diminished sixth, and its enharmonic equivalent is the perfect fourth.
The just augmented third, E, is 456.99 cents or 125:96. The Pythagorean augmented third, E, is 521.51 cents or 177147:131072, eleven just perfect fifths.