Nashville Number System Converter
Convert chord progressions to Nashville numbers and back for any key.
About this tool
The Nashville Number System Converter translates chord progressions between named chords and the number system used by session players in Nashville and beyond. Type the key followed by your chords (separated by spaces or bars) to get the numbers, or type numbers to expand them into chords for that key. It preserves chord qualities like minor, diminished and seventh, making it easy to transpose charts, communicate progressions, and learn how songs are built.
Frequently asked questions
What is the Nashville Number System?
It labels each chord by its scale degree (1-7) in the major key instead of by name, so the same chart works in any key. C Am F G in C becomes 1 6m 4 5.
How do I convert chords to Nashville numbers?
Enter the key as the first word, then your chords, e.g. C C Am F G. Each chord is numbered by its distance from the tonic, keeping minor/diminished/7th suffixes.
Can it convert numbers back to chords?
Yes. If the first item after the key is a number, the tool reads it as a Nashville chart and prints the chords for that key, e.g. G 1 6m 4 5.