You can use an elongated toilet seat on a round toilet, but it may affect the fit, aesthetic, and comfort level.
Elongated toilet seats are considered more comfortable. Their design more accurately fits the human body and provides sufficient space from front to back when sitting.
In general, round toilet seats measure 16.5” while elongated ones measure 18.5”. Due to its differing dimensions, the oval elongated toilet seat creates an overhang off the front of a round toilet bowl. In turn, the seat will extend further into the room, which may be confining in a smaller bathroom.
Decorative elongated toilet seats add a modern, fun, and whimsical aesthetic to your bathroom. If you plan to keep the top lid closed for its unique design, the overhang of the seat won’t be as noticeable or distracting. Instead, anyone entering the room will be drawn to the decorative elements of the toilet seat.