Key Transposition Calculator

No. Capo Fret and Capo Guidance are derived entirely from Semitones to Transpose -- they represent how many frets up a capo needs to sit to achieve that shift, regardless of which key you started in. Changing Source Key relabels Target Key and both key signatures but leaves Capo Fret, Capo Guidance, Interval, and Common Use untouched.

Guitar Capo Fret reads 0 and Capo Guidance explains that the shift isn't achievable with a capo at all, since a capo can only raise pitch. It suggests tuning down by the requested number of semitones instead, or -- if you'd rather keep standard tuning -- capping at the wrapped upward-equivalent fret to reach the same chord shapes an octave higher, with a note when that fret is high enough on the neck to be cramped.

Interval reports the formal music-theory name for the shift, such as "Major 3rd (M3) up" for a 4-semitone rise or "Minor 2nd (m2) down" for a 1-semitone drop. Common Use adds context about why musicians typically make that specific shift -- for example, a 2-semitone move up is labeled a common pop-song key change. Both name the same signed semitone value; neither wraps a downward request into an upward-only label.

Each key's position is looked up on the circle of fifths, which orders the 12 keys by how many sharps or flats their standard key signature carries. Keys on one side of C accumulate sharps as you move further around the circle; keys on the other side accumulate flats. Source Key Signature and Target Key Signature simply report that count for whichever key each field currently holds.