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This chord transposer shifts every chord in a progression up or down by the same interval, instantly. That’s useful when a song sits outside a singer’s comfortable range, or when you need to match a capo position or another instrument’s key.
How to Use
- Choose the song’s current key under From Key.
- Choose the key you want to move it to under To Key.
- Type in the chord progression, separated by spaces or commas.
- Click Transpose to see every chord shifted to the new key.
Quick Reference: The Nashville Number System
Worship leaders often think in numbers instead of letters (1-4-5, 6m-4-1-5) so a progression transfers instantly to any key. For example, a I-V-vi-IV progression is G-D-Em-C in the key of G, and D-A-Bm-G in the key of D. The numbers stay identical across every key; only the chord names change, which is the entire point of thinking in numbers instead of letters.
Nashville session singer Neal Matthews Jr. created this system in the late 1950s as a shorthand for his group, the Jordanaires, to use in the studio. It let musicians follow a chart by ear instead of a written arrangement, and shift keys on the fly without redrawing the whole thing (source).
Diatonic Chords by Key
Every major key has seven chords that naturally belong to it, built from that key’s scale. Knowing these ahead of time makes transposing faster, since you’re really just moving a shape to a new row in the table below rather than guessing at unfamiliar chords.
| Key | I | ii | iii | IV | V | vi | vii° |
|---|---|---|---|---|---|---|---|
| C | C | Dm | Em | F | G | Am | Bdim |
| G | G | Am | Bm | C | D | Em | F#dim |
| D | D | Em | F#m | G | A | Bm | C#dim |
| A | A | Bm | C#m | D | E | F#m | G#dim |
| E | E | F#m | G#m | A | B | C#m | D#dim |
| F | F | Gm | Am | Bb | C | Dm | Edim |
Frequently Asked Questions
Does this handle minor chords and extensions like 7ths?
Yes, anything after the root note (m, 7, maj7, sus4, dim, etc.) carries through unchanged; only the root letter shifts.
Why does it show sharps instead of flats?
The calculator normalizes to sharps internally for simplicity. Enharmonically, C# and Db are the same pitch, so relabel by hand if your chart convention prefers flats.
What’s the easiest key to transpose into for guitar players?
Guitar-friendly keys like G, C, D, A, and E lean on open chords, so transposing into one of those tends to keep chord shapes simple. Moving into a key like Db or Gb usually means barre chords or a capo instead.
Does transposing change how hard a song is to play?
Yes, difficulty can shift a lot even though the melody doesn’t. A song built on easy open chords in G can turn into a run of barre chords in Db, with the actual notes and tune staying exactly the same.