Example:
15 eV = 5.7401e-22 calorie (nutritional)
1 eV = 3.826733e-23 calorie (nutritional) | 1 calorie (nutritional) = 2.613195e+22 eV
Conversion Steps:
15 × (1.602177e-19 / 4186.8) = 5.7401e-22