With the development of the CHARMM force field in the 1970s and 1980s came a software package that was able to model the complexity of macromolecules and biomolecular systems. The CHARMM family has since expanded and improved to include such intricacies as cellular membranes. Sphingolipids were originally found in brain extracts and neurons in the late 1800s and have since been found to be common in mammalian plasma membranes. In recent years, these lipids have been included into the CHARMM36; however, there is still more to these lipids that have yet to be implemented in CHARMM. One such inclusion currently being implemented by the authors of this poster is that of a united-atom representation of these sphingolipids. Currently, lipids in CHARMM36 can be modeled using an ‘all-atom’ representation in which all atoms of the lipids are modeled as interaction sites or a ‘united-atom’ representation in which the hydrogens on the lipid tails are combined onto their connected carbons for computational ease. With the recent implementation of a united-atom representation for phospholipids in CHARMM (C36UAr), the authors are working on extending this for sphingolipids. Although an all-atom force field is useful in many cases, a united-atom force field can also be beneficial, such as in modeling large membrane systems where the atomic details of the lipids can be slightly relaxed for computational ease. Thus, the authors’ goal is to create and implement a C36UAr for sphingolipids. The authors hope that this representation will be used by future researchers to study the functions, properties, and applications of cell membranes.