The amount of deli meat that you need for 50 sandwiches is 16 2/3 lbs of deli meat.
Depending on the sandwich size they often use 5 to 6 ounces of deli meat per sandwich so 50 sandwiches would need 16 to 19 lbs of deli meat.
If you get at least 19 lbs of deli meat you would have more than enough but 16 lbs is often enough as well depending on how thinly or thickly sliced it is.
1 pound of deli meat makes between 5 to 8 sandwiches depending on the thickness of meat and whether or not you're making regular sandwiches or hearty sandwiches.
For regular sandwiches 1 lb of deli meat will make 8 regular sandwiches.
For hearty sandwiches 1 lb of deli meat will make 4 hearty sandwiches.
The thickness of the meat can also affect how many sandwiches you can make.
If you're making sandwiches you can use a medium thickness for the deli meat which is often between 8 to 14 slices of deli meat.
If you're buying deli meat for a gathering or party, you could estimate how many people will be attending and how much food that they'll eat.
A rule of thumb would be to aim for 1/4 lb to 1/2 lb of deli meat per person.
You can also order cheese slices if adding cheese to the sandwiches which are often thinner than deli meat so you can layer more on.
1 lb of meat equals around 8 sandwiches depending on the thickness of the meat.
It's better to have a bit more than you think you need.