According to the United States Department of Agriculture (USDA) National Nutrient Database, one raw fennel bulb weighing 234 grams (g) contains:
72.5 calories.
0.47 g of fat.
2.9 g of protein.
17 g of carbohydrate.
7.3 g of dietary fiber.
no cholesterol.
... is what I get when I type "Fennel macros" into Google.