Chord Builder Calculator

Build chords from root note and chord type. See note composition and inversions.

Root Note (0=C, 1=C#, ... 11=B)

Chord Type

Inversion

Tab to move between fields

Note 1 (semitone)

Note 2 (semitone)4

Note 3 (semitone)7

Note 4 (semitone, -1 if N/A)-1

Interval Pattern Code407

Voicing Code10

How to Use This Calculator

Enter Root Note (0=C, 1=C#, ... 11=B), Chord Type, and Inversion.
Review the Note 1 (semitone) result.
Use Note 2 (semitone) and Note 3 (semitone) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

What each input means

Root Note (0=C, 1=C#, ... 11=B): The root note of the chord using semitone index.
Chord Type: 1=Major, 2=Minor, 3=Dim, 4=Aug, 5=Dom7, 6=Maj7, 7=Min7.
Inversion: 0=Root position, 1=1st inversion, 2=2nd inversion, 3=3rd inversion (7th chords only).

Identify Input Parameters
Root Note (0=C, 1=C#, ... 11=B) = 0, Chord Type = 1, Inversion = 0 = 3 input(s) provided
Calculate Note 1
Note 1
0 = 0
Calculate Note 2
Note 2
4 = 4
Calculate Note 3
Note 3
7 = 7

Engine last updated July 26, 2026. Checked against 4 independently-derived tests — how we verify calculators.

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