What key is my chord progression in?

Often more than one. Paste the chords and the tool lists every plausible reading, best first, with the Roman numerals for each. Am – F – C – G reads as A minor or C major, and both are correct answers to different questions.

Why does it show several keys instead of one?

Because relative keys share the same chords. Anything claiming a single definite key from a chord list alone is overstating what the chords can tell you. The tonic you hear as home decides it.

What are borrowed chords?

Chords that are not diatonic to the key being considered — listed per reading. A single borrowed chord usually means the key is right and the chord is a colour; several borrowed chords usually means the reading is wrong.

Which chord symbols are supported?

Triads, sixths, sevenths, sus2, sus4, add9, ninths, diminished, half-diminished, augmented and slash bass notes. Unrecognised entries are listed rather than guessed at.

Free tool

Chord Progression Analyzer

Paste chords and see every plausible key reading with Roman numerals — including the ties, because relative keys share the same chords.

Analysis happens in your browser. Nothing is uploaded or stored.

Chords

Paste your progression

Spaces, commas, pipes and dashes all work as separators.

Possible keys

A minor8A

4 of 4 chords diatonic

i – VI – III – VII

Every chord belongs to this key.

C major8B

4 of 4 chords diatonic

vi – IV – I – V

Every chord belongs to this key.

G major9B

3 of 4 chords diatonic

ii – bVII – IV – I

Borrowed from outside the key: F

D minor7A

3 of 4 chords diatonic

v – III – VII – IV

Borrowed from outside the key: G

Ranking is not proof. Where two readings score the same, both are musically valid — play the tonic of each and keep the one that sounds like home.

Summary

Chords parsed

4 / 4

Most likely key

A minor

4 of 4 diatonic

Readings shown

Chord tones

Notes in each chord
Chord	Notes
Am	A · C · E
F	F · A · C
C	C · E · G
G	G · B · D

Want progressions instead of analysis? The Chord Progression Generator works in the opposite direction.

Detail

How this works

The analyser scores all 24 keys by how many of your chords are diatonic to each, with a small preference for keys matching the first and last chord — the two positions that most often establish a tonal centre. Readings with at least one diatonic chord are ranked and the top few shown.

Multiple answers are the honest result. A minor and C major contain the same seven chords, so a chord list alone cannot separate them; what separates them is which chord feels like resolution when you play it.

FAQ

Frequently asked questions

Toolbox

See all free ANYANO tools

Train your sound. Generate your song.

ANYANO is the bigger version of this: prepare music you own, train a Sound that stays private to your account, then generate from it.