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How a capo works
A capo clamps all the strings down at one fret, so that fret becomes the new nut. Every fret on a guitar is one semitone, so a capo on fret 1 raises everything by one semitone, fret 2 by two, and so on. Your fingers still play the same shapes — they are just measured from the capo instead of the nut.
That is why guitarists love it: you can sing a song in B♭ while playing open G-shape chords, instead of wrestling with barre chords up the neck.
Sounding key vs shape key
With a capo there are always two keys in play, and keeping them apart avoids most confusion:
- Shape key — the key of the chord shapes your fingers make (what is written on most capo sheets).
- Sounding key — the key the audience actually hears.
Sounding key = shape key + capo fret (in semitones).
G shapes with the capo on fret 2 sound in A major.
A sheet that says “Capo 2” and shows G, C and D is telling you the shapes. A piano player or bassist joining you needs the sounding chords — A, D and E — so translate for them, or print a copy without the capo.
Capo chart: what each shape sounds like
Find the shape family you are playing in the left column, then read across to see the sounding key at each fret. The five open shape families C, A, G, E and D cover almost every folk song.
| Shapes | Fret 0 | Fret 1 | Fret 2 | Fret 3 | Fret 4 | Fret 5 | Fret 6 | Fret 7 |
|---|---|---|---|---|---|---|---|---|
| C | C | D♭ | D | E♭ | E | F | F♯ | G |
| A | A | B♭ | B | C | D♭ | D | E♭ | E |
| G | G | A♭ | A | B♭ | B | C | D♭ | D |
| E | E | F | F♯ | G | A♭ | A | B♭ | B |
| D | D | E♭ | E | F | F♯ | G | A♭ | A |
| Shapes | Fret 0 | Fret 1 | Fret 2 | Fret 3 | Fret 4 | Fret 5 | Fret 6 | Fret 7 |
|---|---|---|---|---|---|---|---|---|
| Am | Am | B♭m | Bm | Cm | C♯m | Dm | E♭m | Em |
| Em | Em | Fm | F♯m | Gm | G♯m | Am | B♭m | Bm |
| Dm | Dm | E♭m | Em | Fm | F♯m | Gm | G♯m | Am |
Find the fret for any key
Usually you start from the other end: the singer needs a particular key, and you want to know where to put the capo. Find the sounding key on the left and pick a shape family. A dash means the capo would have to go above fret 7 — possible, but rarely pleasant.
| To sound in | C shapes | A shapes | G shapes | E shapes | D shapes |
|---|---|---|---|---|---|
| C | no capo | fret 3 | fret 5 | — | — |
| D♭ | fret 1 | fret 4 | fret 6 | — | — |
| D | fret 2 | fret 5 | fret 7 | — | no capo |
| E♭ | fret 3 | fret 6 | — | — | fret 1 |
| E | fret 4 | fret 7 | — | no capo | fret 2 |
| F | fret 5 | — | — | fret 1 | fret 3 |
| F♯ | fret 6 | — | — | fret 2 | fret 4 |
| G | fret 7 | — | no capo | fret 3 | fret 5 |
| A♭ | — | — | fret 1 | fret 4 | fret 6 |
| A | — | no capo | fret 2 | fret 5 | fret 7 |
| B♭ | — | fret 1 | fret 3 | fret 6 | — |
| B | — | fret 2 | fret 4 | fret 7 | — |
Choosing the best fret
Several frets can give the same sounding key. These are the things worth weighing:
- Open shapes. Count the barre chords. G-shape and C-shape songs are mostly open chords; E- and A-shape songs often need a B or F♯m barre. Fewer barres means cleaner changes.
- Voice range. The key is set by the singer, not the guitar. Choose the sounding key first, then the shapes.
- Tone. Each fret makes the guitar a little brighter and shorter in sustain. Frets 1–5 sound full; by fret 7 and above the sound turns sparkly and mandolin-like — lovely as a second guitar, thin as the only one.
- Signature licks. If a song’s riff relies on an open string ringing (a hammer-on from an open D shape, for example), keep the shape family the riff was written in.
- Room to play. Above fret 7 the frets get narrow, which makes some shapes cramped for larger hands.
Capo + transposer workflow
Say a singer needs a song in B♭ major. In B♭ the chords are B♭, E♭, F and Gm — mostly barre chords. Here are the three easiest ways to play it, ranked by the same engine our tools use (it looks at barre chords, stretches and capo height):
| Capo | Play shapes in | Chords you play | Why |
|---|---|---|---|
| Fret 3 | G major | G · C · D · Em | Every chord is an open shape. No barre chords. |
| Fret 1 | A major | A · D · E · F#m | 3 of 4 chords are open shapes. Barre: F#m. |
| Fret 6 | E major | E · A · B · C#m | 2 of 4 chords are open shapes. Barre: B, C#m. |
- Paste the song into the chord transposer and set the original key.
- Choose the key the singer needs as the target key. The chords now show the sounding key.
- Look at the capo suggestions and pick the shapes you like; the sheet switches to the shapes to play.
- Export the PDF — it lists both the capo fret and the sounding key, so nobody has to work it out on stage.
Playing with other guitarists
Two guitars playing the same shapes in the same place tend to blur together. Put one player on open G shapes and the other on D shapes with a capo on fret 5: both sound in G major, but the chord voicings are different, so the sound gets wider instead of muddier. The capo chart above makes it easy to find pairs like this.
When you play with a bass, piano or fiddle, call out the sounding chords. “Capo 3, G shapes” means nothing to the piano player; “B♭, E♭, F” does.
Capo on ukulele
A capo works the same way on a ukulele: one fret, one semitone. With a capo on fret 2, standard GCEA tuning effectively becomes A–D–F♯–B, and your C shape sounds as D. Because the ukulele neck is short, frets 1 to 5 are the practical range. Use a capo made for ukulele — a guitar capo is often too wide and too strong for nylon strings on a small, flat fingerboard.
When a capo is not the answer
A capo solves a lot, but not everything:
- The song needs to go lower. A capo only raises the pitch. Transpose the chords down instead — then, if the new key is awkward, add a capo to get back to open shapes. For example, a song in G that is too high can go down to E (open E shapes), or to F played as D shapes with a capo on fret 3.
- The capo would sit very high. Past fret 7 the tone thins out and the frets get cramped. It is usually better to choose a different shape family that needs a lower fret.
- You need the low open strings. Songs that lean on a ringing low E or a drop-D bass lose that depth with a capo. Some players tune the whole guitar down a semitone or a whole step instead.
- Others read your chart. If a band reads from your sheet, write the sounding chords and add the capo as a note for guitarists only.
Putting the capo on properly
- Place it just behind the fret wire — not on top of it and not in the middle of the fret.
- Keep it straight across the neck so every string is pressed evenly.
- Use the lightest pressure that stops buzzing. Too much pulls the strings sharp.
- Tune without the capo, clip it on, then check the tuning again and touch up if needed.
- Pull the strings back into line if the capo pushed them sideways as you clamped it.
Frequently asked questions
Does a capo change the key of a song?
Yes. Every fret raises the pitch by one semitone, so the song sounds higher even though you keep playing the same chord shapes. G shapes with a capo on fret 2 sound in A major.
Can a capo make a song lower?
No — a capo can only raise the pitch. To go lower, transpose the chords down (or tune the guitar down), then add a capo if you want easier shapes again.
Which fret is best for the capo?
The one that gives the key your voice needs with the easiest open shapes. Frets 1 to 5 sound full and natural; above fret 7 the guitar gets bright and thin and the frets get cramped.
Why does my guitar sound out of tune with a capo?
A capo that sits too far from the fret wire, is tilted, or presses too hard pulls strings sharp. Place it just behind the fret, straight, with only as much pressure as needed, then check your tuning with the capo on.