That doesn’t look like much in most wine glasses, and since glasses come in so many shapes and sizes, it’s hard to have any clue whether you’re on target. To make sure your one glass a night isn’t more like two-and-a-half, set the glass on the table before you decant. A recent study found that people pour 12 percent more when they’re holding the bottle in one hand and glass in the other.

MORE: How to Get the Right Pour