Abstract: A method for organizing and controlling rental inventory provides an alphanumeric code for each principal item, and based thereon an alphanumeric code for each accessory item that may be used with the principal item. Each accessory applicable to more than one principal item is also provided with a unique alias code that identifies the accessory item without reference to its associated principal items. A Base Price is assigned to each principal item and each accessory item, based on a number of factors which can be independently determined for each rental item. The Base Price is multiplied by a Price Factor derived from a Price Index Table according to the desired rental interval, to generate the Price Index for the item. This creates a standard for determining rental prices, and provides a standardized means of measuring many different types of performance in a rental business.