An ottoman used as a footrest is furniture doing a postural job, and the height decides whether it helps or quietly makes things worse.
The Working Rule
A footstool should be at or slightly below the height of the seat you are using it with.
Too low and your legs slope steeply downward, which pulls you forward off the backrest. Too high and your knees are raised above your hips, which rolls the pelvis backward and flattens the lower back.
Level with the seat, or an inch or two lower, keeps the thighs roughly horizontal.
Measure Before Buying
- The seat height of the chair or sofa it will be used with
- Measured from the floor to the compressed cushion, not the uncompressed one
- The distance from the seat front to where your feet naturally fall
- Which determines the depth and how far it sits out
- And the clearance left in the walkway
Ranges listing ottoman dimensions per piece, of the kind at stellamia.org, allow that comparison. Buying on appearance and hoping is how people end up with one that is never used.
Compressed Height, Not Catalogue Height
The measurement that catches people out. An upholstered seat compresses several inches under a person.
Measuring an empty sofa gives a number that is too high, and the ottoman that matches it will be too tall in use.
Elevating Legs
Where legs are being raised for swelling, the usual guidance is higher rather than level: above the level of the heart, which a footstool does not achieve.
An ottoman is comfort rather than a medical measure. Persistent swelling in the legs, particularly in one leg with pain, warmth or redness, warrants medical assessment rather than a footstool.
Trip Hazards
An ottoman in a walkway, particularly a low dark one, is exactly the height that catches a foot.
It matters most for older people and in rooms crossed at night. Keeping them out of routes, or tucked under when not in use, is worth doing.
Not for Standing On
Upholstered stools are unstable underfoot and many have no rigid top.
Casters and Rugs
An ottoman that slides on a hard floor moves when you put your feet on it.
Two Small Beats One Large
Easier to move, easier to store, and they suit two people.
Check the Weight Rating
Ottomans used as occasional seating have a stated capacity, and a small one is not built to be sat on by an adult repeatedly.