This report explains a part of a study on the method for calculating construction period, and proposes an approximate equation to calculate the construction period of reinforced concrete distribution facilities having no basement, such as shopping centers and warehouses. This equation, being easy to use and fast to calculate, can be used as a business tool in course of sales engineering. Moreover, this equation can calculate the construction period by inputting only the total floor area of a building. We have confirmed the reliability of this equation by a statistical test. Some equations and softwares needed to calculate construction period are made public and can be accessed on the internet. However, users need special knowledge of the technology of construction to use these equations and softwares. Besides, there is no report of testing the reliability of results of calculating construction period by these equations and softwares.
