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mcg to IU Converter

Convert vitamin doses between mcg and IU.

Conversion Factors

Vitamin D: 1 mcg = 40 IU. Vitamin A (retinol): 1 mcg = 3.33 IU. Vitamin A (beta-carotene): 1 mcg = 1.667 IU. Vitamin E (natural d-alpha): 1 mg = 1.49 IU. Vitamin E (synthetic dl-alpha): 1 mg = 1.1 IU. These conversions follow WHO/FDA standards.