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Chord Progression Roman Numeral Visualizer

· Last updated：2026-07-18

Analyze a chord progression by key, Roman numerals, harmonic function, transposition, and cadence clues.

Details

What this tool helps you do

Uses an explicit twelve-note, major/natural-minor theory model to label diatonic roots and common seventh-chord qualities. It shows a transposed progression and a browser-side Web Audio audition button. Borrowed chords and ambiguous spellings are shown as chromatic rather than guessed; this is a theory aid, not audio chord recognition.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Media
Input types
textarea, select, number
Output type
html
Sample coverage
4
API ready
Yes

Overview

The Chord Progression Roman Numeral Visualizer helps you analyze chord sequences by mapping them to their corresponding Roman numerals, harmonic functions, and cadences. Using a twelve-note major and natural-minor theory model, it transposes progressions to your target key and provides a browser-side Web Audio audition to hear the chords played back at your chosen tempo.

When to use

  • When analyzing the harmonic structure and Roman numeral degrees of a written chord progression.
  • When transposing a chord sequence from one key to another while maintaining correct theoretical relationships.
  • When teaching or studying music theory concepts like diatonic functions, cadences, and chord qualities.

How it works

  1. 1Enter your chord progression as text, separating the chords with hyphens or spaces.
  2. 2Select the analysis key or let the tool auto-detect it, then choose a target key for transposition.
  3. 3Adjust the playback tempo in BPM and click analyze to view the Roman numerals, harmonic functions, and play the progression via Web Audio.

Use cases

  • Analyzing a jazz turnaround to identify the Roman numeral degrees and harmonic functions.
  • Transposing a pop chord progression to fit a vocalist's range while checking the new chord names.
  • Demonstrating cadence types and chord relationships in a music theory classroom setting.

Examples

1. Analyzing and Transposing a Jazz Turnaround

Songwriter

Background

A songwriter wants to analyze a standard jazz turnaround in C major and transpose it to D major for a new arrangement.

Problem

They need to verify the Roman numeral analysis and see the transposed chord names instantly.

How to use

Input 'Cmaj7 - Am7 - Dm7 - G7' into the Chord Progression field, set the Analysis Key to 'C major', and select 'D major' as the Transpose To option.

{
  "progression": "Cmaj7 - Am7 - Dm7 - G7",
  "key": "C major",
  "transposeTo": "D major",
  "playbackTempo": 96
}

Outcome

The tool displays the Roman numerals 'I - vi - ii - V7', identifies the tonic-to-dominant-preparation movement, and outputs the transposed progression in D major.

2. Analyzing a Minor Key Progression

Music Student

Background

A student is studying natural minor harmony and wants to visualize a common minor progression.

Problem

They need to confirm the Roman numerals for a progression in A minor and hear it played back at a slow tempo.

How to use

FAQ

Can this tool recognize chords from an uploaded audio file?

No, this is a text-based theory tool. It analyzes written chord progressions, not audio recordings.

How does the tool handle borrowed or out-of-key chords?

Chords outside the diatonic key are labeled as chromatic rather than guessed, keeping the analysis theoretically precise.

What chord qualities does the visualizer support?

It supports standard triads and common seventh-chord qualities within a twelve-note major and natural-minor framework.

Does the Web Audio playback require external plugins?

No, the audition feature plays directly in your web browser using built-in Web Audio capabilities.

Can I transpose a progression to a minor key?

Yes, you can select any major or natural-minor key from the transposition options.

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Enter 'Am - Dm - F - E' in the progression input, select 'A minor' as the analysis key, and set the playback tempo to 80 BPM.

{
  "progression": "Am - Dm - F - E",
  "key": "A minor",
  "playbackTempo": 80
}

Outcome

The tool identifies the progression's degrees in A minor, highlights the chromatic dominant chord, and allows browser-based audio playback at 80 BPM.