EPS to PDF size trouble

Hello everyone. I hope you can help. I have been using PDFCreator for a while now and it is very good. However Ive recently used it to change EPS files to PDF files with a problem.

When i convert them, the convertion is really nice, apart from the fact PDFCreator doesnt seem to detect the size of the eps file (is this called the bounding box?). Is there a way to do this. At the moment i am getting a figure (which is landscape) imported into a portrait A4 sized pdf, hence cutting half of the figure out. I know that you can define the size of the page you are converting to manually, but is there an automatic way, so that my exported eps file turns into a nice, tightly fitted pdf file everytime?