The foot joint is the short section at the bottom of the flute, and it comes in two common lengths that add one key difference.
- A C-foot flute's lowest playable note is middle C.
- A B-foot flute has slightly longer tubing and one extra key, extending the range down to the B just below middle C.
That single low B is rarely called for outside of some orchestral repertoire - most intermediate and school-level repertoire never uses it, so a C-foot flute is not a limitation for the vast majority of players. Some players and repair techs also note the added length of a B-foot can give a slightly darker tone and can help the upper register sound less shrill, though this effect is subtle and debated rather than a clear, universally agreed-upon difference.
What this means for buying used
On the used market, B-foot flutes tend to sell for meaningfully more than an otherwise identical C-foot model - reported anecdotally as roughly 20-50% more for a comparable higher or mid-tier flute in open-hole configuration. Unless you specifically know you'll need the low B for orchestral playing, a C-foot flute is a practical way to get more flute for the money on the used market.
