| Ascending Semitones ↑ | Descending Semitones ↓ | Traditional Interval | Interval Class (IC) |
|---|---|---|---|
| 0 | 0 | Unison / Perfect Octave | IC0 |
| 1 | 11 | Minor Second / Major Seventh | IC1 |
| 2 | 10 | Major Second / Minor Seventh | IC2 |
| 3 | 9 | Minor Third / Major Sixth | IC3 |
| 4 | 8 | Major Third / Minor Sixth | IC4 |
| 5 | 7 | Perfect Fourth / Perfect Fifth | IC5 |
| 6 | 6 | Tritone (Augmented Fourth / Diminished Fifth) | IC6 |
| 7 | 5 | Perfect Fifth / Perfect Fourth | IC5 |
| 8 | 4 | Minor Sixth / Major Third | IC4 |
| 9 | 3 | Major Sixth / Minor Third | IC3 |
| 10 | 2 | Minor Seventh / Major Second | IC2 |
| 11 | 1 | Major Seventh / Minor Second | IC1 |
| 12 | 0 | Perfect Octave | IC0 |
| Interval Class | Equivalent Semitones | Traditional Intervals |
|---|---|---|
| IC0 | 0 | Unison / Octave |
| IC1 | 1 / 11 | Minor Second / Major Seventh |
| IC2 | 2 / 10 | Major Second / Minor Seventh |
| IC3 | 3 / 9 | Minor Third / Major Sixth |
| IC4 | 4 / 8 | Major Third / Minor Sixth |
| IC5 | 5 / 7 | Perfect Fourth / Perfect Fifth |
| IC6 | 6 | Tritone |