---
title: Capo and Transposition: How a Capo Changes the Key
dek: A capo raises every open string by one semitone per fret, so a G shape played at fret 2 sounds in A. This shows how to find the sounding key and how to choose a capo position.
topic: guitar
tags: [capo, transposition, guitar]
date: 2026-10-11
author: Yunus Emre Vurgun
level: intro
related: [barre-chords-e-shape-a-shape, transposing-instruments-explained, circle-of-fifths-explained, caged-system-explained]
faq:
  - q: What does a capo do to a chord?
    a: A capo raises every string by as many semitones as its fret number. The shape you finger keeps its name, but it sounds higher. A G shape with the capo at fret 2 sounds in A, because G plus two semitones is A.
  - q: How do I work out the sounding key with a capo?
    a: Take the key of the shape you are playing and count the capo fret in semitones upward. A D shape at capo 5 sounds in G, since five semitones above D is G. The chord names in a chart refer to the sounding key.
  - q: Does a capo change the tuning of the guitar?
    a: No. The strings stay tuned as before. The capo shortens the vibrating length of every string and raises the pitch, so the open-string notes change, but the tuning itself is unchanged when the capo is removed.
  - q: Is a capo the same as transposing?
    a: They are related. Both shift pitch by a fixed number of semitones. A capo moves the whole guitar while the player keeps the shapes, whereas a transposing instrument has its written part changed so that the sounding pitch is correct.
---

A capo is a clamp across the neck that acts as a movable nut. Placed at fret n, it raises every string by n semitones, so the shape you finger sounds n semitones higher than its name. A G-shape chord with the capo at fret 2 sounds in A. To find the sounding key, take the key of the shape and count the capo fret upward in semitones.

## What the capo does to the strings

A capo at fret 2 treats every string as though it had been tuned up two frets. The low E string becomes F#2, the A string becomes B2, and the high E string becomes F#4. The fingering does not change, so a player who knows the G shape can play a chord that sounds in A without learning anything new.

The capo also acts as a new nut, so the vibrating length of every string is shorter, and that is what raises the pitch. The tuning of the guitar is unchanged. Many players hear a capo placed high on the neck as brighter, because the chord sits in a higher register.

Here is the simplest check of the rule. With the capo at fret 2, the low E string sounds F#2, since E plus two semitones is F sharp: [keys]F#2[/keys]

The main practical gain is that the shape keeps its open strings, which ring at the capo's pitch. The capo acts as the nut, so a G shape at capo 2 is still an open-string chord and keeps the resonance of one while sounding in A. Many singer-songwriters use a capo for this reason: it gives a higher key without giving up the open fingering they already know.

## A table of shapes and capo positions

The table gives the sounding key for seven common shapes at capo positions 1 to 7. Find the shape's column, then the row for the capo fret. Each entry is the shape's key, raised by the capo fret.

| Capo | G shape | C shape | D shape | E shape | A shape | Am shape | Em shape |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | Ab | Db | Eb | F | Bb | Bbm | Fm |
| 2 | A | D | E | F# | B | Bm | F#m |
| 3 | Bb | Eb | F | G | C | Cm | Gm |
| 4 | B | E | F# | G# | C# | C#m | G#m |
| 5 | C | F | G | A | D | Dm | Am |
| 6 | Db | F# | Ab | Bb | Eb | Ebm | Bbm |
| 7 | D | G | A | B | E | Em | Bm |

Two entries deserve a second look. G shape at capo 6 is Db, the same pitch as C#, and the table uses the flat spelling. E shape at capo 4 is G#, the same pitch as Ab. Use whichever spelling the chart in front of you uses.

The minor shapes behave in the same way. Am shape at capo 3 sounds in C minor, and Em shape at capo 7 sounds in B minor, because seven semitones above E is B.

Each capo fret also names an interval. Capo 5 raises every chord by a perfect fourth, capo 7 by a perfect fifth and capo 12 by an octave. Because the capo moves every string by the same amount, one capo position moves every shape by the same interval. A player who knows that capo 7 is a fifth can work out the sounding key of any shape without consulting the table.

Capo 1 is the smallest move, a single semitone. Players often use it to put a song a half step higher for a singer, without changing a single chord shape.

## Choosing a capo position for a singer

A capo lets you change the key of a song without changing the chord shapes you know. The most common reason is a singer whose range does not match the key the song was written in. Find the highest and lowest notes of the melody, check them against the key, and move the capo until the melody sits in a comfortable range for the singer.

The steps are practical. Start with the key the singer needs, and count the semitones from the shape's key up to it. That number is the capo fret. Then check the lowest note of the melody, because a capo raises the bass as much as the top. If the song's highest note is still too high for the singer, move the capo down by one fret and try again.

A capo only raises the pitch. To bring a song down, choose a shape whose key is lower than the chart's key. A song in E that needs to be in D can use D shapes with no capo, or C shapes with the capo at 2, since C plus two semitones is D.

A common choice is to play G shapes with the capo at 2 for a song in A. The chords are A major and its relatives, but they are fingered as G shapes, which many players know better than the A shape.

## Finding the sounding key

The method has four steps. Name the key of the shape you are playing. Choose the capo fret. Count that many semitones up the chromatic sequence, C, C#, D, D#, E, F, F#, G, G#, A, A#, B, from the shape's key. The result is the sounding key.

Here is one worked case. A D shape with the capo at 5: D is the shape's key, and five semitones above D is G, because D, D#, E, F, F# and G is five steps. The sounding key is G, and the chord names in a chart for that song should read G.

The same arithmetic runs in reverse. A song in A played with G shapes needs the capo at 2, because G plus two semitones is A. A song in C played with D shapes needs the capo at 10, which is high enough that a C shape with no capo is usually the easier choice. Use the table, count the semitones, and check the result against the chart.

To hear the rule, play the G shape without the capo, then with the capo at 2. The chord changes from G to A, and the same fingering is still correct:

[keys]G3+B3+D4+G4 A3+C#4+E4+A4[/keys]

Then play the progression G, C, D, G with the capo at 2. It sounds A, D, E, A:

[keys bpm=72]A3+C#4+E4+A4 D3+A3+D4+F#4 E3+B3+E4+G#4 A3+C#4+E4+A4[/keys]

## Where this misleads people

The most common error is reading the chord name as the shape. A player who fingers an A shape with the capo at 2 sounds a B chord, not an A chord. The shape name is a fingering, and the sounding chord comes from the shape plus the capo.

Another error is reading a chord chart as a set of shapes. Charts show the sounding chord names. A capo player has to convert those names into shapes, using the table. If the chart says A and the capo is at 2, the shape is G. If the chart says A and the capo is at 5, the shape is E.

A third error is forgetting that the capo changes the bass as well as the top. A capo at 4 raises the low E string four semitones, so a bass line that was played on the lowest string sounds a major third higher. Check the bass as well as the chords.

## What to do with it

Choose a song you know in G, and play it with the capo at 0, then 2, then 4. At each capo position, say the sounding key before you start. Check each answer against the table.

Next, play a G shape and a D shape with the capo at 5, and say the sounding key of each. The G shape sounds in C, and the D shape sounds in G. Then play the open A shape and the G shape at capo 2, and listen for the same notes. They sound the same chord but with different voicings, because the strings and frets sit in different places.

The capo is a transposing device, and the same arithmetic governs transposing instruments. For how a clarinet or trumpet part is written, see [transposing instruments explained](/articles/transposing-instruments-explained/). For the relationship between keys that share notes, [the circle of fifths](/articles/circle-of-fifths-explained/) is the quickest reference. A capo acts as a barre across every string, so the [barre chord article](/articles/barre-chords-e-shape-a-shape/) shows the same idea with a finger, one shape at a time.