I sometimes need to convert my GPS instrument latitude and longitude readings, which are in fractional degrees, to degrees, minutes and seconds. This is usually while working with State flat plane or other UTM tables or software. I wrote a little computer program to do this for me. I just updated it to include converting in the reverse direction, from degrees, minutes and seconds to fractional degrees. I call the program GeoConvert. If anyone elses has the same need, you may download the software for free at:
http://www.radprocalculator.com/GeoConvert.aspx