Woodshed Lab Utility

By the Numbers

A Nashville Number System converter for chord charts, transposition, rehearsals, rhythm-section shorthand, and quick key changes.

Converter

Results

Nashville numbers

Ready
Press Convert.

Minor chords appear as 6m, 2m7, etc. Slash chords appear as 1/3, 5/7, and so on.

Transposed chord chart

Optional
Transposed chords will appear here.

This uses the Nashville conversion as the bridge between the original chart key and the output key.

Chord input

Try: C, Cmaj7, Cm7, C7, C/E, F#m7b5, Bb13, Gsus4, Dadd9, A7#5.

Number input

Try: 1, 4, 5, 6m, 2m7, 57, b7, b3, #4, 1/3, 5/7.

Best use

Use this for rehearsal shorthand, quick transposition, chart cleanup, and teaching harmonic function.

Notation note: Nashville numbers describe scale-degree function inside a key. This tool keeps most chord qualities as written, so Cmaj7 in C becomes 1maj7, Am7 becomes 6m7, and G7/B becomes 57/7. Enharmonic spelling is practical rather than theoretical; choose sharps or flats if the automatic spelling is not what you want.