barley has 214% more calories than couscous - couscous has 112 calories per 100 grams and barley has 352 calories. for macronutrient ratios, barley is similar to couscous for protein, carbs and fat. barley has a macronutrient ratio of 11:86:3 and for couscous, 14:85:2 for protein, carbohydrates and fat from calories.