Chord & Interval Calculator
Build a chord from any root note, and see the full interval breakdown.
Last updated
| Semitones | Interval name | Note |
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How to find the notes in a chord
- Choose the root note, such as C or F♯.
- Choose the chord type: major, minor, seventh, suspended and more.
- Read the notes in the chord and the interval table.
About this tool
Every chord here is built by stacking a fixed set of semitone offsets on top of the root — a major chord is root, +4 semitones, +7 semitones, for example — using standard 12-tone equal temperament, so the same shape works starting from any root. Notes are spelled the way they're written in music: a third is always two letter names above the root and a seventh six, so B♭7 is B♭ – D – F – A♭ (not A# – D – F – G#), and a black-key root takes whichever name gives the simpler chord, so C#/D♭ major is shown as D♭ – F – A♭. The interval table below shows all twelve semitone steps from the root and highlights the ones your selected chord actually uses, which is a quick way to see how a chord relates to the full scale around it.
Nothing entered here is sent to a server — the entire calculation runs as JavaScript in your browser tab.
Questions about chords
What notes are in a C major chord?
C, E and G: the root, a major third (4 semitones) and a perfect fifth (7 semitones).
What is the difference between major and minor chords?
The middle note. A minor chord’s third is one semitone lower: C minor is C, E♭, G.
What is a dominant 7th chord?
A major chord plus a minor seventh: G7 is G, B, D, F. It sounds unresolved and pulls towards the next chord.
Why is it written B♭ and not A♯?
Chord notes are spelled by letter: a third is always two letter names above the root, so B♭7 is B♭, D, F, A♭.