According to Time, in 2012, McDonald's sold 1.2 billion Happy Meals worldwide, which works out to slightly more than 3.2 million Happy Meals per day. In the United States, there are about 220 million Happy Meals sold each year, which is about 602,000 Happy Meals per day.
It is estimated that McDonald's is the favorite fast food of about 40 percent of children. About 10 percent of McDonald's sales each year are from Happy Meals. That adds up to about $3 billion. Between 80 and 90 percent of children report that the toy is the motivating factor for their love of Happy Meals.