Convert extent from state coordinates (meters) to geographic (dd)

[A_J_Beck]

Hello,

I'm currently creating metadata for a couple projects and need to include the bounding coordinates.  However, the program only accepts decimal degrees and all our maps are projected in NAD_1983_HARN_Transverse_Mercator which is in meters (for state of WI).

Is there an way (in ArcView 10 or using math) or website I can use to convert the extents from my feature classes, which are in meters, to decimal degrees so I can record them?

Thanks for any help!