What Are Treadmill Ceiling Height Requirements? Horizon Fitness Updated August 25, 2021 20:19 To calculate a safe ceiling height for your treadmill please add 12" to the height of the tallest household user. Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles How Do I Reset the Lube Belt Message on a Treadmill? What Does Incline Mean on Treadmills? How Much Power Does a Treadmill Use? How Do I Find My Total Treadmill Mileage? What are Treadmill Power Cord Lengths? Comments 0 comments Please sign in to leave a comment.