Take a nice-size plastic container and cut about an inch from the top to make a plastic ring.
Put a sheet of wax paper underneath where you'll be working to make the patties on.
Put a fist-sized amount of ground beef in the ring, or more or less, depending on how thick you want your patties. Remember, depending on the percentage of fat content of the meat, the patty will cook down in size.
Mash the hamburger meat to fully fill out the ring form; then pull the ring off. Ta-da!
Using a three and a half pound package of ground beef, I cooked a skillet of hamburger meat and chopped onions for tacos for supper tonight, and we didn't even use half of it. The remainder I stored in a zip-loc bag to make a goulash or casserole later. With the remainder of the package of ground beef, I cooked nine patties to freeze for quick lunches or suppers.
I used to hate buying bulk ground beef packages because I didn't want to have to divide it into smaller bags for the freezer, but I think I prefer to cook all of it and freeze it in different forms for quicker meals later. And it doesn't take that long, especially if you have two skillets going. : )