How a Capo Changes Guitar Chords: Transpose Without Relearning Shapes

A capo clamps across the fretboard, raising the pitch of all strings equally. Play an open C shape with a capo at fret 2, and you're actually playing a D chord.

The math

Each fret = one semitone. Capo at fret 2 raises everything by 2 semitones (one whole step).

• C shape with capo 2 = D
• G shape with capo 2 = A
• Am shape with capo 2 = Bm
• F shape with capo 2 = G

Why use a capo

• Play in singer-friendly keys while using easy open chord shapes
• Access open-string voicings in keys that don't normally have them
• Change the timbre of familiar chords (higher capo = brighter tone)
• Match the original key of a recording without learning barre chords

What a capo doesn't do

It doesn't change the chord shape — only the pitch. Your G shape still feels like G under your fingers, even though it sounds like A. This is why chord charts for capo'd songs often show the shape name, not the actual pitch.