Connecting Matters. Where do you draw the line?

Before deciding to drink, you should know that New Jersey law (pdf) and University policy prohibits the purchasing, serving, and consumption of alcohol by and to people under 21.

If you're planning on drinking, avoid the negative effects of drinking too much by staying in the "Green Zone"—a blood alcohol concentration (BAC) of under 0.06. If you keep your BAC below 0.06:

  • Alcohol can produce a pleasant effect. You may experience improvements in mood, decreased anxiety, and increased sociability.
  • Your functioning won't be significantly impaired. You may begin to experience impaired fine muscle coordination and a shortened attention span.
  • Your sleep won't be impaired.
  • Your work, academic, or athletic performance will be better for the two to three days after you drink, compared to if you drank heavily.

Keep your BAC below 0.06 using these tips:

Know your limit

Before you go out, calculate what the effect of different numbers of different drinks over different amounts of time will be on your BAC.
  • You’ll know about how many drinks you can have over how much time and stay at a BAC below 0.06
  • If you're already out and looking for quick info, use the Princeton UMatter Now website

Remember that BAC calculators aren’t exact tools. Your BAC depends on many factors, such as:

  • gender*
  • genetics
  • how much you've eaten
  • hydration

*If you identify as trans* but are not taking hormones, use your sex assigned at birth when calculating BAC. If you are taking hormones, use the sex consistent with those hormones for the most accurate BAC estimate.


Food slows the absorption of alcohol into the bloodstream and helps prevent a sudden increase in BAC.
  • Going out at night? Get your friends together to eat a full dinner beforehand. Carbs will especially help.
  • At a cocktail hour or dinner with alcohol? Don't forget to eat while you drink.
  • Create a buddy system to remind each other.


Alternate between alcoholic and non-alcoholic drinks (preferably water).
  • Try to avoid caffeine because it further dehydrates you.
  • Hydrating helps to mitigate the negative effects of alcohol that give you a hangover.
  • Be a good friend: when you’re getting water, grab an extra cup for someone else.


Your body can process one standard drink per hour.
  • Follow the one-in-one rule— try to drink one drink per hour.
  • Keep track of the number of drinks you've had and the amount of time between drinks.
  • You can keep a tally on your phone or use an app. By keeping count, you’ll know when you’ve reached your limit.  
  • Use a buddy system to help keep track.
Measure your drinks, so you know exactly how much you’re drinking per drink.
  • Avoid pre-mixed drinks—you never know how much alcohol has been added.  
  • When making your own mixed drinks, make sure you know how many servings of alcohol you are putting in each drink.
  • Use clean shot glasses to measure out shots.  
  • Know the different sizes of cups around campus.
  • Memorize these pictures to know how much alcohol is in standard drinks:

Standard drink sizes


More Tricks

Drink less (or avoid drinking) when you are exhausted.
  • Exhaustion magnifies the effect of alcohol on the body.  
  • For Princeton students, the highest number of alcohol-related visits to McCosh are often seen after periods of high academic stress, such as Dean's Date.
Support someone's choice not to drink.
  • Don’t ask someone else what’s in their cup or why they aren’t drinking.
  • If you know someone is drinking, avoid cheering them on or encouraging them to start or join a drinking game. 


If you stay in the Green Zone, you’re less likely to have a hangover the next day. Check out this video for why that’s so.