converting eps files

[anthony]

EPS is a very special image format. It probably may have a bad bounding box setting, which sets the EPS image size (though it could draw outside that size.

Also have you specified what -density (resolution) you want the EPS Vector image to be drawn at. The default is 72 dpi. IM has no knowledge of you actual displays resolution which is often 100 or 120 dpi.

See IM examples...
Basics, Image Density
http://www.imagemagick.org/Usage/basics/#density
Text Handling, Resolution, Pointsize, and Actual Font Size
http://www.imagemagick.org/Usage/text/#pointsize