How do I choose the right weight capacity for an ergonomic chair?

Weight capacity specification at OfficeFurniture2go.com uses the 80% load rule: specify a chair rated at least 25% above the user's weight to avoid sustained operation at rated capacity. Standard commercial range covers users to 300 lbs. For users 300–500 lbs, bariatric specifications with reinforced mechanisms and steel base structures are required. We confirm user weight in our specification process and will not specify a chair at its exact rated maximum for a given user. Call 1-800-460-0858.