Benchmark Dose Tools

  • PyBMDS Version 25.2 Release

    The new pybmds version 25.2 release provides the following enhancements to pybmds: trend tests for dichotomous and continuous data, new nested dichotomous plots, added flexibility for modeling variance for continuous data, and the ability to count all model parameters for statistical calculations.   An updated online BMDS User Guide is also available. 

  • 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
Contact Us About Benchmark Dose Tools to ask a question, provide feedback, or report a problem.
Last updated on December 23, 2025