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Choose the tonal centerStart with the note that will act as degree one of the selected scale.
This diatonic chord calculator builds the chords that belong to a selected key. Choose a tonic and scale, then see every scale degree as a triad or seventh chord with Roman numerals and individual chord tones. Explore more audio tools for musicians or return to Ronter Sound.
Select a tonic, choose a scale and build its diatonic triads or seventh chords instantly.
| Degree | Chord | Roman numeral | Quality | Chord tones |
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A diatonic chord calculator starts with a scale and builds chords using only notes that belong to that scale. Select the tonic, choose the scale or mode and decide whether you want triads or seventh chords.
The calculator first creates the seven scale degrees. It then stacks alternate scale tones above every degree. For triads, that means selecting the root, third and fifth from the scale. For seventh chords, one more alternating scale tone is added.
The result shows the chord name, Roman numeral, quality and chord tones for every scale degree. That makes it possible to move quickly between note-level information and the harmonic structure of a key.
For broader hands-on listening practice, you can also work with the Mixer Console Simulator.
Start with the note that will act as degree one of the selected scale.
The interval pattern determines which seven pitch classes belong to the collection.
The calculator stacks scale degrees in thirds and identifies each resulting triad or seventh chord.
Chord numbers here refer to positions inside the selected scale. A triad uses the 1st, 3rd and 5th scale tones counted from its own root. A seventh chord continues the same process to the next alternating scale tone.
In this context, a chord is diatonic when all of its notes come from the selected seven-note scale. If the scale is C major, the available notes are C, D, E, F, G, A and B. Building chords without introducing notes outside that collection produces the familiar diatonic chords of C major.
This is useful when you want to understand the basic harmonic resources available inside a key before introducing chromatic notes, altered harmony or other techniques.
When a progression later becomes an arrangement for real instruments, the instrument recording page provides a separate look at capturing those parts.
The calculator does not assign major and minor labels arbitrarily. Each quality comes from the actual intervals created when notes of the scale are stacked.
In C major, C–E–G forms a major triad, while D–F–A forms a minor triad. B–D–F contains a diminished fifth and therefore produces a diminished triad.
The same construction can be applied after transposition. Change the tonic and the note names move, while the interval structure of the selected mode remains consistent.
If you are turning those harmonic ideas into a song arrangement, song demo production covers the transition from an idea toward a recorded version.
The chords are generated from the notes of the selected scale. Change one scale degree and the resulting chord qualities can change as well. That is why major, minor and the church modes produce different harmonic collections.
Triads contain three chord tones and provide a compact view of the basic harmony. Seventh chords add another diatonic third, creating major seventh, minor seventh, dominant seventh, half-diminished and other qualities according to the selected scale.
Switching between the two views is useful because the Roman numeral degree stays connected to the same scale position even though the chord gains an additional tone.
Once several instrumental and vocal layers are present, the mixing and mastering overview explores a later stage of balancing those recorded elements.
A diatonic chord tool is useful when you know a key or mode but do not want to calculate every chord manually. It can quickly show which triads or seventh chords are created by the notes already present in the scale.
This is helpful for songwriting, arranging, theory practice and transposition. Instead of memorizing a separate list for every key, you can compare the same scale structure from different tonics.
C major contains B natural, while C Mixolydian contains B♭. That single scale-degree change affects the chords built on several degrees, including the chord on degree V.
The major scale follows the interval pattern whole–whole–half–whole–whole–whole–half. Building triads from its seven degrees produces a consistent quality pattern: major, minor, minor, major, major, minor and diminished.
In Roman numerals this is commonly written I–ii–iii–IV–V–vi–vii°. Uppercase numerals indicate major triads, lowercase numerals indicate minor triads and the diminished symbol identifies the final diminished triad.
If you want to move from theory into hands-on audio experimentation, try the Interactive Online Audio Mixer.
Natural minor has a different interval pattern, so its chord qualities are different from major. The natural-minor triads follow minor, diminished, major, minor, minor, major and major.
For A natural minor, this produces Am, B°, C, Dm, Em, F and G. These chords use only the notes A, B, C, D, E, F and G.
In tonal minor music, you may also encounter a raised seventh scale degree and a major dominant chord. That introduces a note outside the natural-minor collection, so it is a separate harmonic choice rather than one of the strictly diatonic natural-minor chords displayed here.
Dorian, Phrygian, Lydian, Mixolydian and Locrian use the same basic seven-note diatonic framework but place the half steps in different positions. As a result, each mode creates its own arrangement of major, minor and diminished chords.
For example, Mixolydian differs from the major scale by its lowered seventh degree. Dorian differs from natural minor by its raised sixth. Those changes affect not only the scale melody but also the chords that can be built from the collection.
Different styles make use of these harmonic colors in different ways. The music genre recording overview looks at musical material from a broader stylistic perspective.
Chord names change when music is transposed, but Roman numerals keep the scale-degree relationship visible. C–F–G in C major and G–C–D in G major have different note names, yet both can be described as I–IV–V.
This makes Roman numerals practical for comparing keys and studying recurring chord relationships without tying the analysis to one absolute pitch.
Musicians preparing material for a session can also use the First Time Recording Studio Guide for practical preparation beyond harmony itself.
The chord-tone column is more than an extra label. It lets you verify exactly why a chord received its quality. If the notes above a root form a major third and perfect fifth, the triad is major. A minor third and perfect fifth produce a minor triad.
Looking at the actual notes can make chord construction easier to understand than memorizing chord names alone.
This note-level awareness can also help when arranging individual instrumental lines before recording songs and instruments .
Select Seventh Chords and the calculator continues the same stacking process one scale tone farther. In C major, the result becomes Cmaj7, Dm7, Em7, Fmaj7, G7, Am7 and Bm7♭5.
This view is useful when working with harmony where the seventh is an important part of the chord sound rather than an optional extension.
Suppose you have a progression built from I–vi–IV–V. Instead of manually calculating every new chord name, choose the destination key and read those four degrees from the result.
The progression keeps its scale-degree structure while the absolute notes change.
When transposed material also requires vocal preparation, the vocal recording overview covers the performance and recording side separately.
When writing, the result can act as a map of the basic chords available from the chosen scale. You can test different degrees without losing track of which notes belong to the current collection.
That does not mean a song must remain completely diatonic. Borrowed chords, secondary dominants, chromatic passing harmony and modulation can all introduce notes outside the scale. The calculator simply gives you a clear starting collection before those additional choices are made.
For a broader discussion of creativity and confidence while developing musical ideas, see Musician Psychology and Recording Confidence .
A mode is not only a different ordering of note names. Its characteristic scale degrees alter the intervals inside the chords that can be built from it.
Lydian's raised fourth, Mixolydian's lowered seventh and Dorian's raised sixth all change the available harmonic relationships compared with ordinary major or natural minor.
Blues and related styles can combine tonal, modal and other harmonic behaviors in ways that extend beyond a single scale collection. The blues and country recording page provides additional musical context for those styles.
The seven generated chords are possibilities, not instructions for a finished progression. Rhythm, chord order, inversion, voicing, melody, bass movement and performance all influence the final musical effect.
Use the calculator to understand the raw harmonic material, then make musical decisions with your ears. You can continue experimenting with related learning utilities in the audio tools collection.
Use the harmonic map as a starting point, then continue into arrangement, performance and recorded sound.
Compare scales, switch between triads and seventh chords, and use the generated notes as a practical reference for your next progression. Continue with more interactive music tools.
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