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Nashville Number System Converter

Turn a chord chart into Nashville numbers for any key, or read a number chart back into chords. Bar lines stay put, chord qualities are carried through, and borrowed chords are called out.

A to G with an optional sharp or flat, e.g. C, F, Bb
which way the chart is written
Chords or numbers separated by spaces, bars with |. In numbers mode: 1 6m 4 57 | 2m7 57 1

Numbers are the degrees of the major scale of the key, so 1 is the tonic chord: in C, 1 4 5 means C F G. Roots outside the key take a flat or sharp in front of the number, so B♭ in C is b7 and F♯ is b5 (write #4 if you prefer the sharp spelling). Chord qualities are copied through as written — Am7 in C becomes 6m7 — and a slash bass note is numbered too, so C/E is 1/3. For a minor-key song, choose its relative major: Am–F–C–G in C reads 6m 4 1 5. Six-nine chords are written 6add9 because a slash always means a bass note. Everything is calculated in your browser; nothing is sent or stored.