You can see saffron nutrition facts in the table below.

See below table for in depth analysis of nutrients:
Saffron (Crocus sativus),
Nutritional value per 100 g.
(Source: USDA National Nutrient data base)
Principle Nutrient Value Percentage of RDA
Energy 310 Kcal 15.50%
Carbohydrates 65.37 g 50%
Protein 11.43 g 21%
Total Fat 5.85 g 29%
Cholesterol 0 mg 0%
Dietary Fiber 3.9 g 10%
Vitamins
Folates 93 µg 23%
Niacin 1.46 mg 9%
Pyridoxine 1.010 mg 77%
Riboflavin 0.267 mg 20%
Vitamin A 530 IU 18%
Vitamin C 80.8 mg 135%
Electrolytes
Sodium 148 mg 10%
Potassium 1724 mg 37%
Minerals
Calcium 111 mg 11%
Copper 0.328 mg 37%
Iron 11.10 mg 139%
Magnesium 264 mg 66%
Manganese 28.408 mg 1235%
Phosphorus 252 mg 36%
Selenium 5.6 µg 10%
Zinc 1.09 mg 10%