How High Does a Toilet Stool Need to Be?

The ordinary sit-down toilet is treated as the natural way. But the 90-degree sitting position only came along with the modern toilet – the body is built for squatting.

When you sit, the exit of the bowel stays partly kinked, because a muscle, the puborectalis sling, holds it like a loop. Only when your knees come higher than your hips does the sling loosen and the angle open up. The right stool height is the one at which exactly that happens.

With a standard toilet of around 40 cm, 18 to 20 cm is often enough. With taller comfort-height toilets you need a higher stool to reach the same angle. What counts isn't the number, it's the angle: knees clearly above hip level.

“Higher is always better.”
No. Too high presses your thighs into your belly and gets uncomfortable. It's about the angle, not the maximum.

“A stool is only for constipation.”
No. It improves emptying in general, symptoms or not.

“The height is the same for everyone.”
No. It depends on toilet height and leg length.

“You need to be able to strain hard for it.”
Quite the opposite. The point is having to strain less.

The right height is the one where your knees sit clearly above your hips – not a fixed number, but the angle that opens the exit of the bowel.