Song Key Finder
Enter your chords and instantly discover what key your song is in. See scale notes, diatonic chords, and common progressions.
Tips for Finding Your Song's Key
- •Enter at least 3–4 chords for the most accurate results
- •Use standard chord symbols: uppercase for major (C, G), lowercase "m" for minor (Am, Dm)
- •Extended chords like 7ths (Cmaj7, Dm7, G7) work too — the tool focuses on root and quality
- •If multiple keys match, the first and last chords of your progression often hint at the true key
- •A relative major and minor share the same notes — the "feel" of your song determines which one it is
How the Song Key Finder Works
Every song is built around a musical key — a set of notes and chords that create its harmonic foundation. The key determines which chords sound natural together and which notes you can use for melodies, basslines, and solos. Knowing your key is essential for writing, arranging, and collaborating.
This tool works by comparing your chords against all 24 major and minor keys. For each key, it checks how many of your chords are "diatonic" — meaning they naturally belong to that key. The key with the highest match percentage is your most likely key.
- •Major keys have 7 diatonic chords following the pattern: I (major), ii (minor), iii (minor), IV (major), V (major), vi (minor), vii° (diminished).
- •Minor keys have 7 diatonic chords following the pattern: i (minor), ii° (diminished), III (major), iv (minor), v (minor), VI (major), VII (major).
- •Extended chords (7ths, 9ths, sus) are reduced to their root quality for matching, so Cmaj7 is treated as C major and Dm7 as D minor.
For best results, enter all the chords in your verse and chorus. The more chords you provide, the more confident the detection becomes.
Understanding Keys in Songwriting
Choosing the right key affects every aspect of your song — from the emotional impact to the vocal range to which instruments sound best. Here is how major and minor keys differ and when to use each.
Major Keys
Character: Bright, happy, uplifting, triumphant
Chord pattern: I - ii - iii - IV - V - vi - vii°
Popular keys: C, G, D, A, E, F
Common in: Pop, country, folk, gospel, classic rock
Famous examples: "Happy" (Pharrell) in F major, "Hey Jude" (The Beatles) in F major, "Shake It Off" (Taylor Swift) in G major
Minor Keys
Character: Dark, emotional, introspective, intense
Chord pattern: i - ii° - III - iv - v - VI - VII
Popular keys: Am, Em, Dm, Bm, F#m, Cm
Common in: Hip hop, R&B, rock, metal, EDM
Famous examples: "Lose Yourself" (Eminem) in D minor, "Rolling in the Deep" (Adele) in C minor, "Stairway to Heaven" (Led Zeppelin) in A minor
Pro Tip: If your chords match both a major and minor key equally, listen to where the song "resolves" or feels at rest. If it resolves to the major chord, you are in the major key; if it resolves to the minor chord, you are in the minor key. The relative major/minor relationship means the notes are identical — only the tonal center differs.
Common Chord Progressions by Genre
Once you know your key, you can use these tried-and-true progressions to write songs in any style. Each progression uses roman numerals so it works in any key.
Pop & Rock
- •I - V - vi - IV — The most popular progression in modern pop (e.g., "Let It Be," "No Woman No Cry")
- •I - vi - IV - V — Classic 50s doo-wop (e.g., "Stand By Me," "Every Breath You Take")
- •I - IV - V — Three-chord rock & roll (e.g., "Twist and Shout," "La Bamba")
Hip Hop & R&B
- •i - VI - III - VII — Dramatic minor loop (e.g., "Hit the Road Jack")
- •vi - IV - I - V — Emotional pop-R&B (e.g., "Numb," "Africa")
- •i - iv - VII - III — Dark trap and drill foundation
Jazz & Neo-Soul
- •ii - V - I — The essential jazz cadence (e.g., "Fly Me to the Moon")
- •I - vi - ii - V — Jazz standard turnaround (e.g., "I Got Rhythm")
- •iii - vi - ii - V — Extended jazz cycle
Country & Folk
- •I - IV - V - I — Classic three-chord country (e.g., "Ring of Fire")
- •I - V - vi - IV — Modern country-pop crossover
- •I - IV - I - V — Traditional folk and bluegrass
Frequently Asked Questions
How do I find what key my song is in?
Enter the chords of your song into the key finder above. The tool analyzes each chord to determine which musical key contains all (or most) of them as diatonic chords. For the most accurate result, enter at least 3-4 chords from your progression. The first and last chords often indicate the key.
What is a diatonic chord?
A diatonic chord is a chord built exclusively from the notes of a given key. For example, in the key of C major, the diatonic chords are C, Dm, Em, F, G, Am, and Bdim. These are the chords that "belong" to the key and sound naturally consonant together. Non-diatonic chords can still appear in a song as chromatic passing chords or borrowed chords.
What's the difference between a major and minor key?
Major keys have a bright, happy, and uplifting sound. Minor keys sound darker, sadder, or more introspective. They differ in their scale patterns: major uses W-W-H-W-W-W-H (whole and half steps), while natural minor uses W-H-W-W-H-W-W. Each produces a different set of diatonic chords with different qualities.
Can I use 7th chords and extended chords?
Yes! The key finder recognizes extended chord symbols including 7ths (Cmaj7, Dm7, G7), 9ths, 11ths, sus chords (Csus4), add chords (Cadd9), and diminished chords (Bdim). The tool strips the extension and focuses on the root note and basic quality (major, minor, or diminished) for key detection.
What if my chords fit multiple keys?
Many chord progressions are diatonic to more than one key. For example, C-G-Am-F fits both C major and A minor (they share the same notes). The tool ranks all possible keys by confidence. To determine the true key, consider which chord feels like "home" — the chord where the song feels resolved. That chord is usually the key.
What is a relative major/minor?
Every major key has a relative minor that shares exactly the same notes but starts from a different root. For example, C major and A minor both use only the white keys on a piano (C-D-E-F-G-A-B). The relative minor starts on the 6th degree of the major scale. This is why your chords often match both a major and minor key with equal confidence.
Why does the tool show a key I didn't expect?
Your song may use borrowed chords (chords from a parallel key), secondary dominants, or modal interchange — all common in pop, rock, and R&B. These non-diatonic chords lower the confidence for any single key. The tool still shows the best match, but you may need to use your ear to decide which key truly feels like home.
How do I enter sharp and flat chords?
Use # for sharps and b (lowercase) for flats. For example: C#m, F#, Bb, Ebm. The tool recognizes both enharmonic spellings (e.g., C# and Db are treated as the same note). Separate chords with spaces, commas, or dashes.