The standard office chair is made for people who are up to 6 feet tall and weigh up to 250 lbs. Just as the name suggests, Big and Tall chairs are built for taller people and have a weight capacity up to 500 lbs. The seat bases are wider for maximum comfort, with much larger backs. The seat cushions are thicker with more padding. It is important to consider the measurements of Big and Tall chairs before purchasing, as the dimensions vary greatly. The lift, wheel, and tilt adjusments are all built for durability.