Convert Vitamin IU to mg or mcg

International Units (IU) are used to measure vitamin potency. The formula for calculating IU depends on the substance being measured. Use the guidelines below to compare labels.

  • 1 mg beta-carotene = 1667 IU
  • 1 mg d-alpha tocopherol = 1.49 IU
  • 1 mg d-alpha tocopheryl succinate = 1.21 IU
  • 1 mg d-alpha tocopheryl acetate = 1.36 IU
  • 1 mcg (μg) vitamin D = 40 IU

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