One cup of raw corn kernels contains 42 grams of carbohydrates, while 1 cup of canned corn kernels contains 32 grams of carbohydrates. A 3-ounce ear of corn contains 20 grams of carbohydrates, and a 4-ounce ear of corn contains 27 grams of carbohydrates.
While corn is commonly classified as a vegetable, it is technically a whole grain food. It is highly nutritious and a good source of fiber, folate, thiamin, phosphorus and vitamin C. One serving of corn also provides 10 percent of the daily value for magnesium. White corn is an excellent source of zeaxanthin and lutein, which support healthy eyes.