NEW Gas Man® 4.3 is now available for download(created 10/18/17)
Gas Man® User Manual is available for download (updated 7/5/12)
Gas Man® Workbook is available for download (updated 5/16/12)
To download the Gas Man software and manuals, please go to the order page. An email to the download page will be sent to you along with a password to allow you to download the free Student Edition, User Manual, and Workbook. The free Gas Man® Student Edition will allow you to play Gas Man® simulations (.gas files) created by others.  It will also allow you to create simulations of your own. To create simulations with drugs not visible in the Student Edition Control Panel, from the Educational Tools tab, download Starter Files for all agents*. With the Student Edition you will be unable to save simulations or copy data to spreadsheets and other programs. These additional features will be available if you purchase Gas Man® Professional Edition (Gas Man Pro). To do so, see the order page. You can see how Gas Man® Pro performs by using one of the time-limited evaluation keys that will be sent to you.

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*You may have to copy and paste the link into a browser window to download.


Gas Man® is a unique computer tool for teaching, simulating and experimenting with anesthesia uptake and distribution. It combines an award-winning tutorial text with powerful, easy-to-use software. Each concept taught by Gas Man® is fully documented and further explained in the tutorial. The Gas Man® computer model graphically simulates the pharmacokinetics of anesthesia administration. It shows the time course of anesthesia uptake in each compartment of the body – lungs, heart, brain – as well as the breathing circuit and vaporizer. Anesthesia uptake and distribution is one of the most challenging subjects in anesthesiology to learn and to teach. This is particularly true now that new agents are available for use in the OR. And for clinical and economic reasons, it is increasingly important for the anesthesiologist to seek the most effective and least costly combination of agents and administration techniques. Gas Man® is the answer: for teaching, experimenting and planning anesthesia administration on the computer, before trying it in the OR. Gas Man® is used by hundreds of practicing anesthesiologists and dozens of medical and veterinary teaching programs around the world. The Gas Man® software is organized around two main screens — the Picture and the Graph. Click below to see samples of these screeens, annotated with more information about the program.


Gas Man® software includes a printed tutorial with a comprehensive set of examples. Click for a sample of the tutorial content. Tutorial contents includes:

  • The one compartment model and its step response or wash-in
  • Two sequential compartments and additive delays
  • The alveolar tension curve
    • The initial rise: alveolar wash-in and its determinants
      • inspired tension
      • alveolar ventilation
      • alveolar volume (FRC)
    • The knee: equilibration with blodd
      • alveolar ventilation
      • cardiac output
      • blood/gas solubility
    • The tail: augmentation by venous return
      • tissue blood flows
      • tissue volumes
      • tissue blood solubilities
      • return of mixed venous blood
  • Blood/gas solubility determines plateau height
  • The concentration effect
  • The second gas effect
  • The effect of patient size
  • Optimal anesthesia course for clinical anesthesia
  • Low flow anesthesia
  • Closed-circuit anesthesia with liquid injection
  • Wake up
  • Analyzing cost of anesthetic agents and techniques
  • Graphical comparison of performance, technique, circuits, costs, and more.

System Requirements



  • PC: Any recent Windows OS (Windows 2000 and NT require special installation instructions)
  • Any processor
  • 4 MB RAM
  • Any recent OS X
  • 4 MB RAM

Gas Man® 4 cross platform

BitRock Cross Platform Installer