Identify The Interval Calculator

Musical intervals are the distances between two notes. This calculator helps you identify the correct interval between any two notes on the chromatic scale. Whether you're a beginner learning music theory or an experienced musician refining your skills, this tool provides quick and accurate interval identification.

What is an Interval?

In music, an interval is the distance between two pitches. It's measured by counting the number of half steps (semitones) between the two notes. Intervals are fundamental to music theory and are used to create melodies, harmonies, and chords.

Did you know? The smallest interval is a half step (1 semitone), while the largest common interval is an octave (12 semitones).

Interval Quality

Intervals can be classified as perfect, major, minor, augmented, or diminished based on their quality:

Perfect intervals have a pure, consonant sound (e.g., unison, fourth, fifth, octave)
Major intervals are slightly larger than perfect intervals (e.g., major second, major third)
Minor intervals are slightly smaller than perfect intervals (e.g., minor second, minor third)
Augmented intervals are larger than perfect intervals by a half step
Diminished intervals are smaller than perfect intervals by a half step

How to Use the Calculator

Using the Identify the Interval Calculator is simple:

Select the first note from the dropdown menu
Select the second note from the dropdown menu
Click the "Calculate" button
View the interval result and description

The calculator determines the interval by counting the number of half steps between the two selected notes. The formula used is:

Interval = |Note2 - Note1| mod 12

Where Note1 and Note2 are the positions of the notes on the chromatic scale (C=0, C#=1, D=2, etc.).

Assumptions

The calculator makes the following assumptions:

All notes are in the same octave
The chromatic scale is used (12 semitones per octave)
Enharmonic notes (e.g., C# and Db) are considered the same

Types of Musical Intervals

Here's a table of common musical intervals and their properties:

Interval Name	Half Steps	Quality	Example
Unison	0	Perfect	C to C
Minor 2nd	1	Minor	C to C#
Major 2nd	2	Major	C to D
Minor 3rd	3	Minor	C to D#
Major 3rd	4	Major	C to E
Perfect 4th	5	Perfect	C to F
Augmented 4th	6	Augmented	C to F#
Perfect 5th	7	Perfect	C to G
Minor 6th	8	Minor	C to A
Major 6th	9	Major	C to A#
Minor 7th	10	Minor	C to B
Major 7th	11	Major	C to C
Octave	12	Perfect	C to C

Worked Examples

Let's look at a few examples of how to identify intervals:

Example 1: C to E

1. C is the first note (position 0 on the chromatic scale)
2. E is the second note (position 4 on the chromatic scale)
3. The difference is 4 - 0 = 4 half steps
4. Looking at the table, 4 half steps is a Major 3rd

Example 2: F to Bb

1. F is the first note (position 5 on the chromatic scale)
2. Bb is the second note (position 10 on the chromatic scale)
3. The difference is 10 - 5 = 5 half steps
4. Looking at the table, 5 half steps is a Perfect 4th

Example 3: G to D

1. G is the first note (position 7 on the chromatic scale)
2. D is the second note (position 2 on the chromatic scale)
3. The difference is |2 - 7| = 5 half steps (we take the absolute value)
4. Looking at the table, 5 half steps is a Perfect 4th

FAQ

What is the difference between a major and minor interval?: A major interval is slightly larger than a perfect interval by a half step, while a minor interval is slightly smaller than a perfect interval by a half step.
Can I use this calculator for notes in different octaves?: No, this calculator assumes all notes are in the same octave. For notes in different octaves, you would need to consider the octave difference separately.
What is the largest interval I can identify with this calculator?: The largest interval you can identify with this calculator is an octave, which is 12 half steps.
How accurate is this calculator?: This calculator is 100% accurate as it uses a simple mathematical formula to determine the interval between two notes.
Can I use this calculator for microtonal music?: No, this calculator is designed for chromatic music (12 semitones per octave) and does not support microtonal intervals.