Force Fields in Molecular Dynamics: AMBER, CHARMM, OPLS and GROMOS Explained

By BioDockify Computational Research Team · August 10, 2026 · MD Fundamentals

A complete guide to MD force fields. Covers AMBER, CHARMM, OPLS-AA, and GROMOS force fields — how they work, when to use each, and how they affect simulation accuracy.

Read the complete article with tables, code and references on BioDockify.

Key References

• Lindorff-Larsen, K. et al. Improved side-chain torsion potentials for the Amber ff99SB protein force field. Proteins 78, 1950-1958 (2010).
• Huang, J. et al. CHARMM36m: improved potential for disordered proteins. Nat. Methods 14, 71-73 (2017).
• Kaminski, G.A. et al. Evaluation and reparametrization of the OPLS-AA force field. J. Phys. Chem. B 105, 6474-6487 (2001).

Scope & Limitations

Force fields are approximations — no single FF is best for all systems Ligand parameterization requires GAFF (AMBER) or CGenFF (CHARMM) Water model must match the force field