What is a standard size for drink of wine?

There isn't one single "standard" size for a drink of wine. It really depends on the context:

By the glass:

* Restaurants: Typically 5-6 ounces (148-177 ml)

* Wine bars: May offer smaller (3-4 ounce) or larger (8-10 ounce) pours

* Home: Personal preference, but generally a 4-6 ounce pour is considered a standard serving

By the bottle:

* Standard bottle: 750 ml (25.4 ounces), which is roughly 5 glasses

* Magnum: 1.5 liters (50.7 ounces), equivalent to two standard bottles

* Jeroboam: 3 liters (101.4 ounces), equivalent to four standard bottles

* Rehoboam: 4.5 liters (152.1 ounces), equivalent to six standard bottles

Other factors:

* Wine type: A heavier, full-bodied red wine might be poured in smaller amounts than a lighter, crisp white wine.

* Occasion: A celebratory dinner might call for larger pours than a casual weeknight meal.

Health considerations:

* Moderate drinking: For adults, generally considered to be no more than one drink per day for women and two drinks per day for men.

* Calories: A standard 5 ounce glass of wine contains around 125 calories.

Ultimately, the "standard" size is a matter of personal preference and context. There's no right or wrong answer, just enjoy your wine responsibly!