Not sure what size you need for your belongings? Use our self storage unit size calculator to estimate the best sized storage unit for your goods. The more information you enter, the more accurate the results. NOTE: The calculator assumes you intend to make full use of the ceiling height in your storage unit. If you have any questions, our expert managers are happy to give you a tour of any of our available units as well as instruct you on the proper ways to store your goods and items to get the most out of the storage space.