how many calories in a cup of walnuts?
Calories in walnuts. 1  13 calories in each half walnut. 2  27 calories in each whole walnut. 3  183 calories in each oz or 28g. 4  185 calories in 14 walnut halves. 5  654 calories in 3Â½ or 100g of walnut. 6  654 calories in 1 cup of halves (50 halves). 7  765 calories in 1 cup (117g) of chopped walnuts.