Sitting can be difficult for some people due to reasons such as advanced age, illness, or recovery from surgery. In such cases, a raised toilet seat can raise the height of the seat, easing the transition from standing to sitting and reducing the effort required.
The most important thing when choosing a toilet seat is to adjust the height so that the user's position is as natural as possible. The hips should be aligned with the knees to prevent awkward postures, with the legs resting at a 90-degree angle. It is recommended, within the user's capabilities, to measure the distance between the lower thigh, behind the knees, and the floor, and then subtract this measurement from the height of the toilet.
Depending on height, the most common toilet risers are 5 cm , recommended for short users; 10 cm risers for average-sized users or if the toilet is used by multiple users; and 15 cm risers for tall users.