The most straightforward way to obtain Gaussian 16 is through the official website of Gaussian Inc. They offer:
A widespread, free package for quantum chemistry calculations.
Density Functional Theory (DFT), semi-empirical methods, and high-level ab initio electronic structure calculations. Best For: Large molecules and transition metal complexes. Cost: Free for academic and non-commercial use.
Individuals can purchase licenses directly from Gaussian, Inc., though the cost is significant. Risks of "Free" Downloads gaussian 16 software download free
If your university has a license, you will be provided with a direct download link and installation instructions for the version compatible with your operating system (Windows, Linux, macOS).
These downloads frequently bundle Trojan horses, spyware, or ransomware that can compromise your entire computer network.
If you describe what specific calculations you need to perform (DFT, post-HF, TD-DFT, etc.), I can help recommend the best free alternative for your use case. The most straightforward way to obtain Gaussian 16
While Gaussian 16 is not available as a free download for the general public, it remains the gold standard for computational research. For those on a budget, checking or switching to an academic powerhouse like ORCA is the best way to conduct high-quality research without the high price tag.
: Maps out chemical reaction pathways and barriers.
Gaussian 16 is the latest version in the Gaussian series—a powerhouse in the world of computational chemistry used by chemists, chemical engineers, and physicists worldwide. Because it is a proprietary, professional-grade software, finding a legitimate "free download" is a common but tricky search. Best For: Large molecules and transition metal complexes
: A comprehensive, zero-cost quantum chemistry package maintained by the Gordon Research Group.
ORCA is a highly popular, modern electronic structure program. It is free for academic and non-commercial use.