Full or Half Kegs

At my college graduation party we had about 50 people attend and a 1/4 barrel keg. We had half of the keg left the next day and I alone put a pretty good dent in it and we played beer pong with the beer from it. The next morning my dad brother and I drank some more as we cleaned up lol. Kegs last a lot longer than you'd think!

A single keg will give you around 80 beers.

Depending on how many of the 100 people are children, that could suffice.

I agree with PK, but also take into account who your crowd is - you know them best. For instance, if my crowd with roughly 90 people (which includes 5 or so kids), got served two half kegs of light beer and cider, we'd be through them roughly 30 minutes in, no joke. First off, most of them drink micros, so they get used to the high alcohol content. Second, they can drink. So in a lighter-drinking crowd, yeah, that works. I'm personally having 3 kegs and 3 cases of wine. With some champagne and signature drink, I think we're good...but I also don't mind having leftovers. Calculators are crap when you know your crowd will drink more or less.

Are the kegs like a standard size? I assume that if we do get two 1/2 kegs then that would be plenty for everyone to get a beer (and some might not drink) so whatever was left the more hearty drinkers could polish them off. I hate the idea of getting too much and having it go to waste. I also feel like if given the option more people will drink more of the cider over the beer since it is a fall wedding.

Two half-kegs would not be enough for 100 people in my crowd. It's my understanding the kegs are a standard size. Google told me pony kegs (half the size of a standard keg) has 82 twelve-ounce beers in it. So 164 total. Are all of your guests over 21 and drinkers? If so, then that's only enough for 1-2 beers each.

My friends and I hosted a graduation party last summer that had maybe 40 people throughout the night and we polished off a full keg.

I asked my coworker a similar question- he said you can safely bet 2-3 drinks per person (we were talking wine though) but it's probably not a bad bet on average.

I work as an Event Coordinator at a brewery that does weddings. We offer 1/6 barrel kegs and 50L kegs. Typically, the 1/6 barrel will pour 40 pints of beer and the 50L will pour 124 pints. You should do a quick check on your guest list to see how many drinkers you may have. I personally would maybe go with about 2 pints per person. If you wanted to offer different options, I would go with the smaller kegs. The other thing to think about, is you wouldn't be able to take any leftovers from the kegs home due to liquor laws. However, if you did have leftovers, I recommend bringing a few growlers to fill to take home!

Last year at my FSIL wedding, they had purchased two half kegs of beer. They had approximately 115 guests, and they had an absurd amount of beer left over.

Advice, if you have the kegs, make sure all your guests know that they exist, and that the beer is free. Everyone from her wedding didn't seem to realize that it was free, and they were buying from a cash bar. Neither the bartender or servers let anyone know about the beer, so it went completely to waste.