For 100 people, you would typically need around 25 gallons of punch. This estimate is based on each person consuming about 8 ounces (1 cup) of punch. It's always a good idea to have extra on hand just in case.
In order to serve 225 people one 8 ounce serving of fruit punch, 14.06 gallons is needed. The general serving size is 8 ounces. There are 128 ounces in 1 gallon, that is 16 servings per gallon.
One cup is equivalent to 0.0625 gallon. So you will need 1.75 gallons of fruit punch to serve 28 students a cup each. Ed
You will need around 4 gallons of punch to serve 150 people. This amount would only be for one serving per person.
8 gallons
7 1/2 gallons
about 25 gallons
For example, the amount of Hawaiian punch needed to serve ten people if you know how much will serve one person. Or, the daily nutritional value of one serving. Or the diffusion coefficients when you mix Hawaiian punch with water.
secrets from a caterers kitchen is a book you should read-one thing it talks about is food&beverage amounts because NO ONE can ever know how much ppl will eat or drink but you certainly dont want to run out of food and you dont want to waste your money by getting too much. another good idea is looking up a beverage recipe online and seeing how many ppl it will serve and weighing that against the volume of the beverage ex.http://www.foodnetwork.com/recipes/alton-brown/cape-fear-punch-recipe/index.html
You would need 7.5 gallons to get 120 8 ounce servings.
If your question is that you have four gallons of cider and you are going to serve it in eight oune cups, will you have enough to serve to 30 people; then the answer is yes. You would have enough to serve 30 peopole 2 servings each and still have cider left.
About 4 gallons, allowing for an 8 oz. serving, One gallon will serve about 16 people.