How to convert ‘mg’ or ‘mcg’ to ‘IU’ for Vitamins A, D and E?

To convert Vitamin A (as Retinol):
      From IU to mcg:  IU/3.33 = mcg
      For example: 5000 IU/3.33 = 1500 mcg
      From mcg to IU: mcg * 3.33 = IU

To convert Vitamin A (as Beta-Carotene):
      From IU to mcg:  IU/1.66 = mcg
      From mcg to IU: mcg * 1.66 = IU

To convert Vitamin D:
      From IU to mcg: IU/40 = mcg
      For example: 400 IU/40 = 10 mcg
      From mcg to IU: mcg * 40 =IU

To convert Vitamin E if the product label has dl-Alpha-tocopherol as the ingredient:
      From IU to mg: IU * 0.9 = mg
      For example:  30 IU * 0.9 = 27 mg
      From mg to IU: mg * 1.1 = IU

To convert Vitamin E if the product label has d-Alpha-tocopherol as the ingredient:
      From IU to mg: IU * 0.67 = mg
      For example: 30 IU * 0.67 = 20.1 mg
      From mg to IU: mg * 1.5 = IU

~Praveen Jada

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