Enter the Pantone color code in the Pantone Color Finder located here: http://www.pantone.co.uk/pages/pantone/colorfinder.aspx.
The Web page will bring up a small swatch of that color.
If you are working on a PC, press the "Print Screen" button. If you work on a Mac, use your "Grab" application to capture at least the portion of the screen that has the color swatch.
Open Photoshop. If you use a PC, hit "Ctrl" and "V" to paste the page with the color swatch. If you are working on a Mac, simply open the edited image.
Open the DigitalColor Meter if you are working on a Mac and run the arrow over the color swatch. The DigitalColor Meter will convert the Pantone color into multiple codes, including five RGB codes, four Y'PbPr codes, three CIE codes and Tristimulus. If you're using a PC, use the Photoshop color picker. Click on the Pantone color with the dropper tool, and the RGB code will appear as the foreground color selection.