Our heavy Duty Stools are rated for at least 300 lbs. We also have a 24/7 Stool class which includes heavy duty office stools that rated for 24/7 use (more than the 40-hour work week). Most extended height chairs or stools in the marketplace carry weight limits of 250 lbs. and their warranties cover a 40 hours per week. Our line-up found here are rated for at least 300 lbs. and many carry the 24-7 around the clock certification as it applies to the factory warranty.