Standard toilet seats come in two different shapes: elongated, which are typically 18 or 19 inches long, or round, which are about 16 inches long. Make sure to check the shape of your toilet bowl before purchasing a new toilet seat. Once you have determined what shape of seat you need, there are a lot of additional options to further customize your seat. Soft close hinges are extremely popular because they ensure the seat closes slowly without slamming shut. Another popular option is heated seats, which are plugged into an outlet and can be very nice for cold nights.