How much salad lettuce is needed for 5 people?

It's impossible to say exactly how much lettuce you'll need for 5 people without knowing:

* How hungry are they? Are they light eaters or big salad fans?

* What kind of salad is it? A simple side salad will need less lettuce than a large main-course salad.

* What other ingredients are in the salad? More ingredients might mean you can use less lettuce.

Here are some general guidelines:

* Small side salad: About 1-2 cups of lettuce per person (5-10 cups total)

* Large main-course salad: About 3-4 cups of lettuce per person (15-20 cups total)

For a safer bet, I'd recommend aiming for around 3 cups of lettuce per person, which would be 15 cups total for 5 people. You can always add more if needed, but it's better to have a bit extra than not enough!