The Staffed Family Child Care Network Cost Estimation Tool, the third in the series of five ECQA Center documents, is designed to assist State, regional and local organizations in better understanding the costs associated with operating a staffed FCC network. Those seeking to expand an existing network or collaborative partners pooling resources to meet the needs of family child care providers may also find the tool helpful. This cost estimation tool (CET) accompanies the resource Developing a Staffed Family Child Care Network: A Technical Assistance Manual (TA Manual), which is available at https://childcareta.acf.hhs.gov/resource/developing-staffed-family-child-care-network-technical-assistance-manual. The CET is designed to function as a dynamic model that can be used to estimate the operating costs associated with services offered by a staffed FCC network and the delivery of those services, in different state and community contexts. The data and assumptions used in the CET are based upon the best available information regarding operating costs obtained from existing FCC networks, expense data from the 2015 Head Start National Summary Program Information Report (PIR) (see appendix for additional information on PIR data), and the professional judgment of the developers of the CET. (author abstract)