You can find some information about it in "Intermolecular and surface forces" book. There are some relevant tables in it, which allows you to predict approximate packing factor according to general structure of surfactant.
There are also some more specific methods in the literature to predict packing factor...
"The surfactant packing factor is expressed as v/(a*l), where "v" is the volume
of the surfactant tail, "a" is the surfactant area per molecule, and "l" is the length of the surfactant hydrophobe."
Enhancing Solubilization in Microemulsions—State of the Art and Current Trends, Jean-Louis Salager, Raquel E. Antón, David A. Sabatini*, Jeffrey H. Harwell, Edgar J. Acosta, and Laura I. Tolosa