Part of our guide to getting the chords to any song.
You can make a Nashville Number chart for any song in two steps: get the song's chords and key, then convert each chord to the number of the scale degree it sits on. The numbering is the easy half. In the key of C, a C chord is 1, an F chord is 4, a G chord is 5, and you write the rest the same way. The slow, skill-heavy half is figuring out the chords and the key from the recording in the first place, and that is exactly the part you can now hand to a transcription tool.
Here is the part most people get backwards. The dedicated charting apps, like JotChord and the Nashville Numbers app, do not listen to your song. They format numbers you have already typed in. So the real work is never the formatting; it is hearing the chords. Transcribe the recording to get the chords and key automatically, then number them, and the whole job collapses into a few minutes.
What a Nashville Number chart is
A Nashville Number chart is an ordinary chord chart with one swap: instead of chord letters, you write the number of the scale degree each chord lands on in the song's key. The tonic chord is always 1, and you count up the scale from there, so the numbers run 1 through 7. Studio musicians in Nashville worked this out in the 1950s to chart songs fast during sessions, and it is now standard on those sessions and very common on worship teams.
The reason it caught on is that the chart is key-independent. Because every chord is written as its position relative to the key, not as a fixed letter, the same sheet of paper works in any key. If the singer wants the song a whole step higher tonight, nobody rewrites the chart: 1 still means the tonic and 5 still means the dominant, so the band just maps the numbers onto the new key and transposes on the fly. That is the same idea behind transposition, except the chart is built so the transposing happens in the players' heads in real time.
Compared with a standard chord chart, that is the trade. A lettered chart is instantly readable but locked to one key; a number chart takes a beat longer to read but travels to any key for free. For a band that changes keys to suit different singers, week to week, the number chart wins easily, which is why it is the default in so many worship band settings.
Why the hard part is the chords, not the numbers
Converting chords to numbers is arithmetic. Once you know the key and the chords, you map each chord onto a scale degree and you are done. Anyone can learn it in an afternoon. The hard skill is the step before that: listening to a recording and working out what the chords actually are and what key the song is in. That is ear training, and it takes years to do quickly and reliably across styles.
This is the trap with the charting apps. JotChord and the Nashville Numbers app are good at what they do, which is laying out numbers cleanly once you type them, but neither one hears your song. You still have to sit with the track, find the key, pick out each chord by ear, and enter the result. The app is a formatter, not a transcriber. So if the chords are the bottleneck, a tool that only tidies up the numbers does not touch your actual problem. You want to remove the listening work, then format what comes out.
Get the chords and key from the recording
This is the step to automate. Run the recording through a transcription tool and let it detect the notes, the chords, and the key for you. With Songscription, you upload an audio file or paste a link to a video, and it returns a lead sheet with the chord symbols above the staff, plus the detected key, along with MIDI and an interactive piano roll you can slow down to check anything that sounds off. No note entry, and you can fix any chord in the browser before you start numbering.
Knowing the key matters as much as the chords, because the key is what every number is measured against. Get the key wrong and the whole chart is numbered against the wrong tonic. If you want to sanity-check it yourself, our guide on finding the key and BPM of a song walks through the clues, and the chord list itself usually gives it away once you see which chord the song keeps resolving home to. For the general workflow of pulling a chord chart out of a track, see how to get chords for any song.
Turn the chords into numbers
Now the quick part. Write out the major scale of your key and number it 1 through 7, then match each chord in your chart to the degree its root sits on. In C major the scale is C, D, E, F, G, A, B, so the mapping is:
- C = 1 (the tonic, a major chord, written as a plain number)
- Dm = 2m (minor)
- Em = 3m (minor)
- F = 4 (major)
- G = 5 (major)
- Am = 6m (minor)
- Bdim = 7 (diminished)
Notice the pattern in the qualities, because it holds in every major key. The 1, 4, and 5 chords are major and get a bare number. The 2, 3, and 6 are minor and carry a lowercase m (2m, 3m, 6m). The 7 is diminished. Those are the diatonic chords, the ones built from the notes already in the key, and you only add a quality mark when a chord differs from the plain major number. A C-major progression of C, Am, F, G becomes 1, 6m, 4, 5, and that line now reads the same whether the band plays it in C, in G, or anywhere else.
A chord from outside the key keeps its own quality on its number too. If a song in C borrows a D major chord, that is a 2 (major), not a 2m, and the bare number flags that it is not the diatonic minor you would expect. Slash chords carry their bass the same way, so a C chord with an E in the bass is 1 over a 3, written 1/3.
Rhythm gets a light layer of marks on top of the numbers, and you only reach for them when the groove is not obvious. A diamond around a number means hold that chord and let it ring; a small hat over a number means hit it hard and choke it short; a push, written as a little angled mark before a chord, means anticipate the chord by an eighth note instead of landing on the beat; and dots or short slashes over a number split an uneven bar into its beats. Most charts stay clean and add these only where the arrangement needs them.
Where Songscription fits
Here is the honest version, because it is also the useful one. Songscription does not export a finished Nashville Number chart. What it does is the part that actually costs you time and skill: it listens to the recording and gives you the chords, a lead sheet, and the key automatically. Converting that chord chart to numbers is the two-minute manual step this article just walked through, and you can do it on paper or by typing the numbers into JotChord or the Nashville Numbers app, which are built to format exactly that.
So the fast path is: transcribe the song with Songscription to get the chords and key, read the key off the result, number the chords 1 through 7, and add the few rhythm marks your arrangement needs. The tool removes the bottleneck, the ear training, and leaves you the easy arithmetic. If you would rather see the whole chord workflow first, our guide on getting chords for any song covers it end to end. When you are ready, start at audio to sheet music, pull the chords and key, and turn them into numbers.
Frequently Asked Questions
What is the Nashville Number System?
It is a way of writing a chord chart with numbers instead of chord letters. Each chord becomes the scale degree it sits on in the song's key, so 1 is the tonic, 4 is the subdominant, 5 is the dominant, and so on through 7. Because the chart is written in numbers rather than a fixed key, the same sheet works in any key: the band just reads the numbers and plays them wherever the singer wants. It was developed by studio musicians in Nashville in the 1950s and is now standard on sessions and very common on worship teams.
How do you convert chords to Nashville numbers?
Find the key first, then number the scale of that key 1 through 7 and match each chord to its degree. In C major the scale is C D E F G A B, so C is 1, D is 2, E is 3, F is 4, G is 5, A is 6, and B is 7. A C chord becomes 1, an F chord becomes 4, a G chord becomes 5. Keep the chord's quality on the number: in a major key the 2, 3, and 6 chords are minor (2m, 3m, 6m), the 7 is diminished, and the 1, 4, and 5 are major and written as a plain number.
Can a Nashville number chart be played in any key?
Yes, that is the whole point of the system. The numbers describe each chord's position relative to the key, not a specific letter, so the same chart works no matter what key the song is performed in. If the singer wants the song a step higher, nobody rewrites anything: 1 still means the tonic, 5 still means the dominant, and each player maps the numbers onto the new key on the fly. That is why studios and worship teams use it when the key can change at the last minute.
Does Songscription export a Nashville number chart?
Not as a native format. Songscription transcribes the recording into the chords, a lead sheet, and the key, which is the part that takes real listening skill. Turning that chord chart into numbers is the quick manual step: once you have the key and the chords in front of you, numbering them takes a couple of minutes. So Songscription removes the slow, error-prone part of the job and leaves you the easy conversion, which you can do on paper or in a dedicated charting app like JotChord or the Nashville Numbers app.
