It's a question often asked so we thought it best to dedicate a page to this common question
It can be difficult when figuring out the consumption rates of people.
So here's a little guide that may help.
For about 50 people we normally suggest breaking down what you think your attendees will drink on average per hour.
Basically a 50 ltr keg holds about 5.5 cartons of beer as an estimate which is about 132 drinks,
At an average of maybe 2 drinks in the first hour and then 1 drink per hour after that should give you an estimate of what you would require.
50 x 2 = 100 (1st hour)
50 x 4 = 200 ( 2nd - 5th hour)
Estimated drinks = 300
300 drinks ÷ 132 (number of drinks in a keg) = 2.72
Basically 3 kegs. or 150L of beer.
I don't want to now confuse you be you can get kegs in 17L, 25L and 50L Kegs
Here's my suggestion for a bit of variety.
1x50L of your favorite beer
1x50L of a lighter % beer
1x 25L Ginger Beer
1 x 17L Cider