How many carbs are in onions?

One medium onion about 2 ½ inches in diameter has 10 grams of carbohydrates. Two of those are indigestible fiber, while 5 grams are sugars. There are 44 calories in an onion.

A medium onion offers 1 gram of protein and 14 percent of the recommended daily value of vitamin C. These vegetables also contain small amounts of sodium, calcium and iron but no fat.

Onion consumption is increasing. In 1982, the average American ate a bit more than 12 pounds of onions annually. By 2010, that had increased to 20 pounds. In 2011, the worldwide onion consumption average was almost 14 pounds. Libyans ate the most onions, almost 67 pounds per person.