Maxent software for species habitat modeling

Most current version: 3.3.3k (see new features below).

Use this site to download software based on the maximum-entropy approach for species habitat modeling.  This software takes as input a set of layers or environmental variables (such as elevation, precipitation, etc.), as well as a set of georeferenced occurrence locations, and produces a model of the range of the given species.

Further description of this approach can be found in:

Terms of use:   This software may be freely downloaded and used for all educational and research activities.  In addition, this software may also be used for commercial or for-profit purposes.  For commercial applications, you are strongly encouraged to make a donation in the name of Maxent to a conservation non-profit, such as the Wildlife Conservation Society, the Nature Conservancy, or the Center for Biodiversity and Conservation at the American Museum of Natural History.  (And please let us know when you do!)

This software is provided "as-is", and does not come with any warranty or guarantee of any kind.  The software may not be further distributed.  By clicking on the download button below, you agree to these terms.

Please provide your name, institution and email address prior to downloading.


Current version (recommended): 3.3.3k

Older, archived versions: 3.3.3e 3.3.3a 3.3.3 3.3.2 3.3.1 3.3.0-beta 3.2.19 3.2.1 3.1.0 3.0.6-beta 3.0.4-beta 3.0.3-beta 3.0.2-beta 3.0.1-beta 3.0-beta 2.3.0 2.2.0 2.1.0 2.0.0 1.8.2 1.8.1 1.6.2 1.0-beta

Discussion Group

There is a google discussion group for users of this software at  Please sign up for this group for discussions and questions about the software, and also to get information about updates, bugs, etc.


A tutorial explaining how to use this software is provided here as a word document.  The data that goes along with this tutorial is available from this zip file.



Here are the datasets used in the Ecological Modeling paper referenced above:

Main changes in Version 3.3

See readme file for details on changes to earlier versions.