How many calories are in walnuts?

There are 185 calories in an ounce of walnuts, which is equivalent to seven whole walnuts or 14 halves. The calories consist of 84 percent fat, 8 percent carbohydrates and 8 percent protein. While walnuts are high in per-serving calories, their numerous health benefits offset caloric concerns.

Walnuts are an excellent source of omega-3 fats, which lower cholesterol and reduce inflammation. Walnuts also contain fiber that regulates blood sugar and supports healthy elimination. The vitamin E and L-arginine in walnuts keep the artery walls open and flexible, which protects against heart attacks. The American Heart Association recommends four servings of unprocessed nuts a week. Walnuts belong to the tree nut family that includes almonds, cashews, pecans and pistachios.