MusicReasonProgression, Transposition, and Arranging
What capo position gets me this key?
Choose the sounding key you need. This tool lists every capo fret and familiar open-shape combination that produces it, so you can pick the shape you already know how to play.
Answer
Want to learn more? Transposition for Voice, Instruments, and Arranging
Understand
This tool only considers the seven natural-letter open major shapes (C, D, E, F, G, A, B) as "familiar," since those are the shapes most guitarists already know without a barre. It does not guarantee any option is physically comfortable: some capo positions land in awkward spots for a given hand or guitar neck, which this tool cannot know from key alone.
Worked example
To sound in the key of G, playing F shapes with a capo on the 2nd fret produces the correct sounding key. Placing no capo at all and playing G shapes directly also works, trivially preserving the key with zero transposition.
Method and limitations
For each capo fret from 0 through 7, the tool subtracts that many semitones from the sounding key's root to find the shape root you would actually play, then keeps only the results landing on one of the seven natural-letter shapes. This launch scope covers standard tuning only; alternate or custom tunings are not yet supported.
Why players reach for a capo at all
A capo lets a guitarist keep an open-string chord shape's ringing tone and familiar fingering while still landing on whatever key a song actually needs, which matters most when accompanying a singer whose comfortable range does not line up with the shape you already know best. It is also how two guitarists commonly play together in the same key using completely different, mutually complementary shapes.