MusicReasonProgression, Transposition, and Arranging
What is this progression in Nashville numbers?
Type a chord progression or a number sequence and a key. This tool converts between chord symbols and Nashville-style degree numbers, stating its own notation grammar rather than claiming one universal convention.
Answer
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Want to learn more? Transposition for Voice, Instruments, and Arranging
Understand
Nashville numbers describe a chord's scale degree, not its absolute pitch, which is why session musicians use the system to communicate a progression once and play it correctly in whatever key a singer needs that day. This tool implements one explicit numbering grammar; other written variants exist and may format minor or seventh chords slightly differently.
Worked example
C, Am, F, G in the key of C major converts to 1, 6m, 4, 5. Converting that number sequence back in the same key returns exactly the original chords, since the two directions are exact inverses of each other.
Method and limitations
Each chord's root is mapped to its diatonic scale-degree number in the declared key; a lowercase "m" suffix marks a minor-quality diatonic chord, and other suffixes are preserved verbatim. A root that is not diatonic to the declared key is reported as unsupported rather than assigned an invented chromatic degree number.