Song Key Calculator
Key from Notes Used
Enter up to 7 notes used in the song to find the most likely key
Key Signature Info
Get detailed info about a specific key signature
Formula
Key detection compares input notes against all 24 major/minor scales. Score = number of input notes found in each scale. Highest score = most likely key.
Frequently Asked Questions
How do I find the key of a song?
Identify the chords or notes used in the song, then compare them to known major and minor scales. The key whose scale contains all (or most) of the song's notes is likely the key. The first or last chord is often the key.
What is a relative key?
Relative keys share the same set of notes but have different tonal centers. C Major and A Minor are relative keys; both use only the white keys on a piano but sound different because of their different root notes.
What is a key signature?
A key signature is the set of sharps or flats at the beginning of sheet music that indicates which key the piece is in. C Major has no sharps or flats, G Major has one sharp (F#), F Major has one flat (Bb), etc.
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