When you print, your computer should display a print settings dialog window. Double-check there and make sure the size is set to 100% and there are not any auto-scale, fit to page, shrink to fit, or resize options turned on. If the print size is still not what you prefer, you may have some adjustment options depending on what Web browser software you are using.
In Mozilla Firefox, choose the “View” menu, then the “Zoom” sub-menu, and then select “Zoom Text Only”. Now go back through the same menus and chose “Zoom In” or “Zoom Out” to adjust the text size.