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"This measurement will be important for users who might propel themselves with their feet, such as residents in a senior living facility. Measure vertically from the back of the knees to the ground, with the feet resting flat on the floor. If the person will be using footrests, add two or more inches to this measurement to account for footrest clearance. The standard seat to floor height is 18 to 20 inches. Adding a cushion adds approximately 2 inches of seat height."
<https://www.discountramps.com/how-to/mobility/measure-manual-wheelchair/a/b95/>