Grand pianos are generally categorized by overall length, roughly from just under 1.5 meters ("baby grand") up to full 2.7+ meter concert grands. Longer strings and a larger soundboard generally allow for a richer, more resonant bass and greater dynamic range - which is why concert halls use the largest instruments.
What actually matters for a home or studio
- Room size and reflective surfaces: a large grand in a small, heavily furnished room can sound boxy or overwhelming; a small grand in a large, hard-surfaced room can sound thin.
- Listening distance: in a home, you sit much closer to the instrument than a concert audience does, which changes how bass response is perceived.
- Physical space: beyond the piano's footprint, leave room for the lid to open fully and for a player to sit comfortably - grand pianos need noticeably more clearance than their case dimensions suggest.
As a rule of thumb, bigger is not automatically better for a home setting - matching the instrument to the room it will actually live in matters more than chasing maximum length.
