Identify The Intervals Calculator

Music theory involves understanding the relationships between notes, and one fundamental concept is the musical interval. An interval is the distance between two pitches, measured in semitones. This calculator helps you identify the type of interval between any two notes on the chromatic scale.

How to Use This Calculator

Using the Identify the Intervals Calculator is simple:

Select the first note from the dropdown menu.
Select the second note from the dropdown menu.
Click the "Calculate" button to determine the interval.
Review the result, which includes the interval name, quality, and number of semitones.

The calculator will show you the exact interval between the two notes you've selected, along with additional information about the interval's properties.

How Intervals Are Calculated

Musical intervals are calculated based on the number of semitones between two notes. The chromatic scale consists of 12 semitones, and intervals are named based on their position in this scale.

Interval = |Note 2 - Note 1| mod 12

Where:

Note 1 is the first note selected
Note 2 is the second note selected
mod 12 ensures the result is within the 12-note chromatic scale

The calculator then maps this semitone difference to the standard interval names (e.g., minor 2nd, major 3rd, perfect 5th).

Types of Musical Intervals

Musical intervals can be categorized into several types based on their quality and size:

Perfect Intervals: 1st, 4th, 5th, and 8th (unison, perfect 4th, perfect 5th, octave)
Major Intervals: 2nd, 3rd, 6th, and 7th (major 2nd, major 3rd, major 6th, major 7th)
Minor Intervals: 2nd, 3rd, 6th, and 7th (minor 2nd, minor 3rd, minor 6th, minor 7th)
Diminished Intervals: 1st, 2nd, 3rd, 4th, 5th, 6th, and 7th (diminished 2nd through diminished 7th)
Augmented Intervals: 1st, 2nd, 3rd, 4th, 5th, 6th, and 7th (augmented 2nd through augmented 7th)

Each interval type has specific harmonic properties that contribute to the overall sound of a piece of music.

Worked Examples

Example 1: C to E

If you select C as the first note and E as the second note:

C is the 1st note in the chromatic scale (0 semitones)
E is the 5th note in the chromatic scale (4 semitones)
The interval is 4 semitones, which is a major 3rd

The calculator will display: "The interval between C and E is a major 3rd (4 semitones)."

Example 2: F to Bb

If you select F as the first note and Bb as the second note:

F is the 6th note in the chromatic scale (5 semitones)
Bb is the 11th note in the chromatic scale (10 semitones)
The interval is 5 semitones, which is a perfect 4th

The calculator will display: "The interval between F and Bb is a perfect 4th (5 semitones)."

Frequently Asked Questions

What is the difference between a major and minor interval?: A major interval has a larger distance between the two notes than a minor interval of the same number. For example, a major 3rd is 4 semitones, while a minor 3rd is 3 semitones.
How do I identify an interval if I don't know the note names?: You can use the calculator by selecting the notes from the dropdown menus. The calculator will determine the interval based on the selected notes.
What is the largest interval on the chromatic scale?: The largest interval on the chromatic scale is the octave, which spans 12 semitones.
Can this calculator identify intervals in different keys?: Yes, the calculator works with any combination of notes from the chromatic scale, regardless of the key.
What is the difference between a perfect and imperfect interval?: Perfect intervals (1st, 4th, 5th, 8th) have a specific, exact distance between the two notes. Imperfect intervals (2nd, 3rd, 6th, 7th) can be either major or minor.