You will want to look for a few different measurements when choosing an ottoman to make sure your furniture and space dimensions work well together: Length: The ottoman should be one-half to two-thirds the length of your sofa Height: The ottoman should be at equal or 1-2” lower than the height of the sofa’s seat cushions. Any higher and it won’t be comfortable to put your feet up. Placement: Allow 12-18” of space between the ottoman and your surrounding furniture. This allows for easy access to items on the ottoman, with space to move around.