The intervals inside piano chords

Updated September 27, 2026

An interval measures the distance between two pitches. Instead of memorizing C major as three unrelated keys, notice the distances inside it: C to E is a major third, E to G is a minor third, and C to G is a perfect fifth. Those relationships explain why the shape works and what changes when you make it minor.

The exercise above first plays pairs, then joins their notes into C major and C minor. Start slowly and listen to each pair before moving on. The keyboard highlights the next pitch and waits until you play it. You are comparing sounds and positions, not racing a timer. Repeating a completed exercise keeps its completion mark in the beginner path.

Count letters for the interval number

From C up to E, count C, D, E: three letter names. This is some kind of third. C up to Eb also spans C, D, E, so it is still a third. The flat changes the interval's quality, not its letter count. From C to G, count C, D, E, F, G: five letters, making a fifth.

This count includes both endpoints. Half-step counting works differently: it counts movements between neighboring keys. If that distinction is confusing, name the letter distance first, then count the actual key movements separately. Neither method by itself gives every part of an interval's name.

Count half steps for the quality

Starting at C, the moves to C#, D, D# and E total four half steps. With the three-letter distance already established, that makes C to E a major third. Stop one step earlier at Eb, the same piano key as D#, and C to Eb is a minor third, three half steps wide.

Use sharps and flats if the different names for one black key are new. The spelling matters: writing Eb tells you that this pitch takes E's place in the chord. In these examples, the intervals are all within an octave; wider intervals can be learned after these shorter ones feel familiar.

Build from the root

The root gives a chord its name. For both C major and C minor it is C. Measure the other two notes from that root:

• C major: C, E four half steps above it, G seven half steps above it.
• C minor: C, Eb three half steps above it, G seven half steps above it.

The fifth stays the same while the third moves. After the guided exercise, use the C major chord page and C minor chord page to hear the tones together. The note exercise checks their sequence; it does not require you to hold a complete chord simultaneously.

Notice the two stacked thirds

You can also measure adjacent chord tones. In root-position C major, C to E is four half steps and E to G is three. In C minor, C to Eb is three and Eb to G is four. Both totals reach the same G, seven half steps above C.

Avoid memorizing only “every other white key.” That happens to produce C major, but D F A is D minor. The spacing of the white keys changes, even when the visual pattern looks similar. The basic chords lesson lets you compare C, F, G and A minor directly.

Recognize, then rearrange

For listening practice, try the interval ear-training game. Hear the pair again when unsure and compare it with the pairs in this exercise. Learning a chord shape and recognizing an interval by ear are related skills, but passing one does not prove the other.

Next, chord inversions rearranges the same C, E and G in different octaves. C remains the root even when it is not the lowest note. The distinction between root and bass will help you understand smoother chord changes.