For most gatherings, plan about 1⁄3–1⁄2 pound of cooked corned beef per person when it’s the main dish, and a bit less if it’s just part of a buffet or sandwiches.

Quick Scoop

  • Main course (plated meal): 6–8 oz cooked corned beef per person (about 1⁄3–1⁄2 lb).
  • Big eaters / want leftovers: aim closer to 1⁄2 lb cooked per person.
  • Buffet with lots of sides: 3–4 oz cooked per person.
  • Sandwiches: 2–4 oz cooked per person, depending on how “stacked” you want them.

Because corned beef shrinks during cooking, you usually need more raw meat than your final serving size:

  • Typical guideline: 3⁄4–1 lb raw corned beef per person for generous portions and some loss during cooking.

Tiny example

Planning St. Patrick’s Day dinner for 8 where corned beef is the star and you want happy, full guests?

  • Use 1⁄2 lb cooked per person → 4 lbs cooked total.
  • That usually means starting with about 6–8 lbs raw corned beef, depending on how much it’s trimmed and how much you want left over.

Information gathered from public forums or data available on the internet and portrayed here.