Many experts suggest that your table be about waist height, or such that you can stand straight with your arms bent at a right angle with forearms resting on the table.
However, quilters often prefer the table a little shorter, hitting at the top of the hips (read through an excellent discussion about cutting table height here for things to consider). That height tends to work better for rotary cutting.
Kitchen counter top height works for a lot of quilters. You may want to try a bit of cutting on yours (with mat, of course!) to see how that height works for you.
Once you have determined a good height, you’ll probably need to raise your table. You definitely will if it’s a table you’d normally sit at.
Monica, from Cut, Stitch + Piece provides three easy solutions for raising the height of a table.
Monica also discovered a great article at Ann’s Quilt N’ Stuff about making a table from scratch. The top has a layer of batting under the cover so it can be used for both pressing and cutting.
Image Source: The image at the top of the page is from Fiskars.