Which beverage has a standard drink size of 313 mL?

• A. Vodka
• B. Scotch Whiskey
• C. UDL
• D. Light Strength Beer

Answer: (C)

Standard drinks are a way to compare alcohol content by amount of ethanol, not by volume. One standard drink contains about 10 grams of ethanol, and the volume you pour to reach that amount depends on how strong the beverage is. Strong spirits deliver a lot of alcohol in a small amount, so their standard drink is a small volume. Beer with higher alcohol content also has a smaller standard drink volume, while beverages with very low alcohol (low-strength options) require larger volumes to reach 10 grams of ethanol.

In this list, the Ultra Low-Strength option is designed so that one standard drink equals a 313 mL serving. That makes 313 mL the specific standard-serve size for that beverage. The other options deliver their standard drink in much smaller volumes (spirits) or in typical beer volumes that don’t align with 313 mL as the standard amount. So 313 mL best matches the standard drink size for the low-strength option.