Your ChordsExample
Your ChordsExample
Detected KeyClick any chord for diagram
Detected Key
C
Major
100%
Perfect match
4/4 chords diatonic
Chord Analysis — click for diagram
C Major and A Minor are relative keys — they share the same chords. The chord the song resolves to is the true tonic.
Other Possible Keys
A Minor100%
CIIIAmiFVIGVII
G Major75%
CIVAmiiFGI
F Major75%
CVAmiiiFIG
D Minor75%
CVIIAmvFIIIG
E Minor75%
CVIAmivFGIII
How to Use
- 1Click "Load example" to try a sample progression, or type your own chords into the input area.
- 2The key is detected instantly as you type. The top result shows the most likely key with a confidence percentage.
- 3The chord analysis shows the roman numeral role of each chord (I, IV, V, vi, etc.) in the detected key. Chords outside the key are shown in red.
- 4Click any chord in the analysis to see its finger position diagram. If two keys tie, they are relative keys — use the chord the song resolves to as the true tonic.
About this tool
About the Guitar Key Finder
Guitar Tool Hub's free key finder analyzes your chord progression and instantly identifies the musical key. Paste any combination of chords — including complex shapes like Dm7, Gsus4, and Cadd9 — and the tool scores all 24 possible keys (12 major + 12 minor) based on how many chords are diatonic. The chord analysis displays the roman numeral role of each chord, and every chord is clickable to open a finger diagram.
- 01Detects major and minor keys from any chord progression
- 02Scores all 24 keys and ranks by confidence percentage
- 03Roman numeral analysis for every chord (I, IV, V, vi, ii°, etc.)
- 04Highlights chords that fall outside the detected key
- 05Explains relative key ties (e.g. C Major and A Minor)
- 06Clickable chord diagrams — free, no account needed