My computer is out of room, how do I move my Lightroom catalogue?

I would say it's more likely to be the images taking up the storage and not your lightroom catalogue. I suggest trying to find when the image are stored and moving them first. Once you have moved the images, you will then need to tell Lightroom where to find them.

Richard

Where are the photos located? These take up much more space than the catalog file. If they are on the internal drive, MOVE the photos, not the catalog file. Instructions (see Part 2): http://www.computer-darkroom.com/lr2_find_folder/find-folder.htm

There is a Lightroom folder within the pictures folder, and that Lightroom folder contains the catalog and other relevant folders needed for the proper functioning of Lightroom. But the image files are not in the catalog. They are simply in folders on the hard drive. If the computer is "out of space" then your best option would be to add an external hard drive and move your image collection to that external hard drive and update the folder location in Lightroom.