It's important to understand the amount of ingredients used in cocktails in order to make a well balanced cocktail. Using a jigger to measure the ingredients helps prevent overpouring. Most jiggers allow you to measure by 1 1/2 oz on one end and 3/4 oz on the other end. (1 oz - 2 tbsp)
In the United States, most cocktail liquid ingredients are measured by ounces (oz). On Cocktail Times, most of the cocktail recipes are measured by ounce with a few exceptions. Some cocktail recipes are measured with "parts" such as 2 parts vodka and 1/2 part grenadine.
1 dash = 4 to 5 drops
3 teaspoons = 1 tablespoon
1 tablespoon = 1/2 oz
1 pony = 1 oz
1 jigger = 1 1/2 oz
1 cup = 8 oz
1/2 fresh lime = 1/2 oz
1/2 fresh lemon = 1/2 to 3/4 oz
Dash: This measurement is often used for tiny amount of liquid ingredients.
Teaspoon (tsp): One teaspoon of liquid amounts about 1/5 oz. Some bars use bar spoon instead of teaspoon, but the reasons of usage is about the same. Most barspoons have twisted handle.
1 tsp = /16 oz or 1/3 tablespoon (tbsp)
Tablespoon (tbsp): 1 tbsp = 1/2 oz or 3 tsp
Cup: One cup amounts as much as 8 ounces. When serving more than 2 person, cup becomes handy.