Benchmark Dose Tools

  • New & Updated BMDS Products

    BMDS Online receives a major update with new models, and is joined by the introduction of BMDS Desktop (for offline access) and pybmds (for advanced users with scripting experience). 

  • CatReg 3.1.0.7

    Categorical Regression (CatReg) complements BMDS by providing  categorical regression analysis on toxicity data. Note that the Windows-based CatReg application also requires R for Windows version 3.4 to 3.4.4. (Later versions of R limit some CatReg functionality.)

Predicting chemical dose and estimating the quantitative relationship between this dose and a response are critical components of risk assessment.  

EPA's Benchmark Dose Software (BMDS) provides easy access to numerous mathematical models. These models help risk assessors estimate the quantitative relationship between a chemical dose and a response. 

EPA’s BMD tools include BMDS (Online, Desktop, pybmds), and Categorical Regression (CatReg).

Hexagon presenting network of BMDS application icons

  • About Benchmark Dose Modeling

    Learn more about Benchmark Dose Modeling and how it is used in risk assessment.

    Learn more about BMDS

  • Benchmark Dose Tools Suite

    Explore the suite of BMDS tools that support benchmark dose modeling.

    Explore the modeling tools

  • BMDS Training and Resources

    View training videos and aids that go beyond the software documentation.

    Go beyond the user guide
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Last updated on May 7, 2025