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Capo Calculator - Shapes and Fret to Sounding Key

Work out what key your open chord shapes sound in with a capo on, or the other way around: find the capo fret that lets you play a song's key with the easy shapes you already know.

Choose shapes and a fret, or a song key, and the sounding key or capo position updates below it.

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The one rule behind every capo position

A capo shortens every string by the same amount, which raises whatever shape you play by exactly one semitone per fret. That is the entire rule: an open G shape with no capo sounds as G, the same shape with a capo on fret 1 sounds as G#/Ab, and with a capo on fret 2 it sounds as A. Counting up by semitones from any open shape (G, A, B, C, D, E) tells you exactly what key that shape sounds in at any fret from 0 to 7.

Going the other way works the same way in reverse: to find a capo fret for a target key, count the semitones from your chosen open shape up to that key. G to Bb is three semitones (G, G#, A, A#/Bb), so G shapes need a capo on fret 3 to sound in Bb. The calculator runs this both directions so you never have to count frets on your fingers.

Choosing shapes worth using

Not every shape set is equally friendly. The calculator flags C, G, D, A, and E as the standard easy open-major shapes, plus Am, Em, and Dm for minor keys, because these use open strings and no barre. A song in an awkward key like Db major has no comfortable open shape on its own, but Db is one semitone above C, so C shapes with a capo on fret 1 give you the same song in easy open chords.

The full 0 to 7 table for a song key is useful when more than one position works, since it lets you pick based on more than the shapes alone. A lower fret, capo 1 to 3, usually keeps more of the guitar's open ring and is easier on the fretting hand, while a higher fret, capo 5 to 7, shortens the scale length noticeably and can suit a singer who needs the same shapes but a brighter, tighter tone.

Limits worth knowing

The maths assumes standard tuning (E A D G B E) and a capo placed cleanly just behind the fret wire; a capo seated too far from the fret, a guitar tuned to drop D or another altered tuning, or a partial capo covering only some strings will all produce a sounding key different from the calculation.

The tool covers frets 0 to 7 because that is where the vast majority of capo playing happens and where open-string ring still works well; a capo above fret 7 is physically possible but starts to fight the guitar's scale length and intonation, and most players would change which open shapes they use, or simply play higher up the neck without a capo, rather than push a capo that high.

Capo calculator blueprint

What each setting does and where to start.

InputsOpen chord shapes plus a capo fret (0-7), or a song key plus preferred shapes.
OutputsThe sounding key for a shape and fret, the capo fret(s) for a target key, or a full capo 0-7 table.
FormulaSounding key = shape's key + capo fret, one semitone per fret.
RangeCapo frets 0 to 7; all 12 major and minor keys.
Best forMatching a singer's range, playing along without a capo-less transposition, quick key changes on stage.
LimitsAssumes standard tuning and a capo seated directly behind the fret; partial capos and altered tunings are not modeled.
RelatedChord Transposer for turning capo shapes into a real, capo-free chord chart.

How to Use the Capo Calculator

Three ways to work with the same fretboard maths

1

Pick shapes plus a capo fret

Choose the open chord shapes you are playing and a capo fret from 0 to 7, and see the key they actually sound in.

Tips: Each fret raises the sound by one semitone, so G shapes with capo 2 sound in A.

2

Or start from the song's key

Enter the key the song is actually in and the calculator suggests capo positions and the open shapes to play at each one.

Tips: It flags the easiest shape sets, C, G, D, A, E, Am, Em, and Dm, so you are not stuck with barre chords.

3

Scan the full capo table

See every capo position from 0 to 7 for a song key at once, with the shapes for each and the easy ones marked.

Tips: Useful for picking the fret that also suits your capo's own comfortable range on the neck.

Capo Calculator Questions

Matching capo frets, shapes, and the key you actually need.

Every fret raises the sound of an open shape by one semitone, so a capo on fret 2 with G shapes sounds in A, two semitones above G, and a capo on fret 5 with the same G shapes sounds in C.
Bb is three semitones above G, so G shapes with a capo on fret 3 sound in Bb. The calculator will also show that D shapes with capo 8 or C shapes with capo 10 technically reach Bb too, though a low fret 3 with G shapes is the practical choice most players would pick.
Some keys have two correct spellings, like A# and Bb, which are the same pitch. The calculator picks the spelling that is more common for that key in guitar chord charts, but either name refers to the identical sounding chord.
It is exact music theory, one semitone per fret, not an approximation, so the sounding key is correct for a guitar in standard tuning with the capo placed directly behind the fret wire. A capo seated loosely or a guitar tuned even slightly off standard pitch will shift the real sound away from the calculated key.
No. It only works with the key, fret, and shapes you enter in the moment, entirely in your browser, and nothing is saved or sent anywhere.
Use the chord transposer: paste your chord sheet in the open shapes you are playing, set it to shift up by the same number of semitones as the capo fret, and it rewrites every chord to its real sounding name while keeping your lyrics and layout intact.

More calculators and practice tools

Turn a capo position into a full chord chart, or check the bar and tempo maths for the same song.

Want an original backing track to practice the new shapes over? AI music generator

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