Average Bottle / Crown Cap = 12 ounces / 22 ounces

Balthazar = 12 litres or 3.17 gallons

Barrel = 31.5 U.S. gallons or 1.17 hectolitres. In the UK, 1 Barrel holds 36 imperial gallons or 1.63 hectolitres

Beer Bottle with Cork and Cage = 750 ml (750 ml bottle serves approximately three 8-ounce glasses of beer)

Grolsch Bottle = 22 oz. or 650 ml / 50 oz. or 1.5 litres / 169 oz. or 5 litres

Jeroboam = 3 litres or 3/4 gallon

Keg = a half-barrel or approximately 15 U.S. gallons and weighs about 136 pounds ("Real-life" experiments translate that to about one-hundred-forty-two 12-cup servings)

Import Keg = 13.2 gallons of beer

Magnum = 1.5 litres

Methuselah = 6 litres or 1.58 gallons

Middle or Pot = 10 ounces

Nebuchadnezzar = 15 litres or 3.96 gallons

Pony or Quarter-barrel Keg = 7.75 gallons

Rehoboam = 4.5 litres or 1.188 gallons

Salmanazar = 9 litres or 2.37 gallons

Schooner = 15 ounces

Sixth-barrel Keg = ~5 gallons

Stubbie = ~12 ounces, but is shorter and fatter than the typical American beer bottle

Cheers!

You may wish to add a bit of class when serving beer. This classic set is a great starting point. You may also wish to seek out Stemmed Pilsners or Wheat Beer Glasses before expanding to Champagne Flutes or Digestive Glasses.
Spiegelau Barrel Beer Classics Lager Glass, Set of 6 in Barrel Gift Tube

Spiegelau Beer Classics Ultimate Beer Glass Set 6-pc.