Tool
Vitamin unit converter: IU to µg and mg
Convert label amounts between international units (IU) and mass for vitamins A, D and E, using the USP definition of one IU for each form.
Conversion factors
| Vitamin | Form | 1 IU equals |
|---|---|---|
| Vitamin D | Cholecalciferol (D3) or ergocalciferol (D2) | 0.025 µg |
| Vitamin A | Retinol | 0.3 µg |
| Vitamin A | Retinyl acetate | 0.344 µg |
| Vitamin A | Retinyl palmitate | 0.55 µg |
| Vitamin E | d-alpha-tocopherol | 0.671 mg |
| Vitamin E | d-alpha-tocopheryl acetate | 0.735 mg |
| Vitamin E | d-alpha-tocopheryl succinate | 0.826 mg |
| Vitamin E | dl-alpha-tocopherol | 0.911 mg |
| Vitamin E | dl-alpha-tocopheryl acetate | 1 mg |
EU labels state vitamins A, D and E by mass (µg or mg α-TE), not IU. Use the factor for the exact form in your formula.
Reviewed by Atakan Cilingir, Technical Sales Manager, SoleChem Kimya A.Ş. · Updated October 2026
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