How much watermelon for 400 people?

A good rule of thumb is to plan on 1 pound (0.45kg) of watermelon per person. Therefore for feeding 400 people, you'll need 400 pounds (181kg) of watermelon.

This quantity can vary depending on the size and appetite of your guests, whether other food will be served, and the desired portion size. If you want to err on the side of caution, or expect particularly hungry guests, you can increase the quantity to 1.5 or even 2 pounds per person.

In addition to whole watermelons, you may also want to consider other watermelon options such as pre-cut watermelon wedges or watermelon balls, which can be more convenient and easier to serve to a large group of people.

It's always best to purchase and prepare your watermelon in advance to ensure it's properly chilled and ready to serve when your guests arrive.