Which height is right for me?

Two things are important for the Wave Stool to work:

Having most of your torso weight supported under your ‘seat bones’ at the bottom of the pelvis, rather than under the thighs. This helps you sit upright. If the seat is too high it will put more pressure under your thighs near the front of the seat (you won’t be able to put your heels firmly on the floor).

Having your thighs sloping down at slight angle of 5 to 10 degrees. This also makes it easier for most people to sit upright. If the seat is too low your thighs will not slope.

If at all possible, whatever chair you use -
Your desk can be adapted or replaced if necessary, but your back cannot be replaced, so give it the best care you can.

(If you simply have to sit at a high surface, or share a stool (see booster cushion), you can use a stool one size higher. By sitting towards the front of the seat you can tip it to a steeper angle, relieving the pressure on your thighs. You won’t be as comfortable sitting at the back of the seat for long periods.)

If you can borrow a wave stool go to Find your height using a borrowed wave stool

If you can't borrow a wave stool use this guide:

Your Height Stool Model Stool Height Desk Height
5’2” to 5’9” Medium 48cm suits a normal desk (about 69 to 74cm)
5’9” to 6’2” Tall 52cm suits a normal desk (about 69 to 74cm)

The stool is measured to the top of the upholstery at the front edge

This guide works for people of average proportions wearing flat shoes (lower leg length is difficult to measure accurately, but is closely related to your height).

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If you have long legs, or usually wear heels, and are 1" or 2" below the above heights, choose the next stool up.
If you have shorter legs, or usually sit with barefoot, and are 1" or 2" above the above heights, choose the next stool down.

Still not sure which height? Use a chair to simulate a wave stool

See also Tips to improve your workplace comfort