Abstract: Systems and methods for adaptive preventative maintenance are disclosed. In a method to determine a maintenance interval estimate for equipment, a first maintenance interval estimate associated with the equipment is provided. The first maintenance interval estimate is expressed according to a usage metric associated with the equipment. An indication that the equipment has been replaced may be received. An elapsed usage of the equipment in a time period may be determined. The time period may span from a reference time point associated with the first maintenance interval estimate to a later replacement time point associated with the replacement of the equipment. A second maintenance interval estimate may be determined based on the elapsed usage of the equipment. The second maintenance interval estimate may be expressed according to the usage metric associated with the equipment.