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Principal Sponsors

The William and Flora Hewlett Foundation
The Hewlett Logo

Makes grants to address the most serious social and environmental problems facing society, where risk capital, responsibly invested, may make a difference over time.
The NSF LogoNational Science Foundation

An independent federal agency created by Congress in 1950 to promote the progress of science.

Other Sponsors Logo

Full Install

The full PhET installation package installs a copy of the PhET website onto your computer. Once installed, you do not need to be connected to the Internet to view or run any of the simulations.

These installers of the PhET Simulations are updated weekly. We suggest uninstalling your earlier versions of PhET before installing.

If you have an Internet connection that is too slow, we can send you a CD with the full installation package. Click here to contact us.

Help & Troubleshooting

For assistance with installation and compatibility issues, please visit our troubleshooting and support page.

Support Software

Our simulations require Java 1.4 or newer and Flash 7 or newer, both of which are available at no cost. If you don't have them on your computer or aren't sure about your versions, click here.

Creating an Installation CD-ROM

You can make a CD-ROM for doing the full PhET installation on computers without Internet access. You will need a computer equipped with a CD writer, a blank CD, and an Internet connection. Please contact PhET help with any questions.

Follow the instructions below:

  • Download the PhET CD-ROM Distribution archive onto your computer (89 MB).
  • Extract the contents of the archive (on most operating systems, this is done by double-clicking the downloaded file).
  • Copy all the files to the CD-ROM.
  • Please remember to periodically check for updated versions of the PhET simulations.
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