Vitamin D (dose) unit converter
Intake dose of vitamin D (D2 or D3): international units (IU) to micrograms. 1 µg = 40 IU. Not the blood level.
Also known as: Vitamin D3, Vitamin D2, Cholecalciferol, Ergocalciferol, Colecalciferol, IE
Converter
Enter a value in any unit and all other units fill in.
Dose conversions apply only to the substance and form named here. Do not use them to dose medicines; follow the label, the package leaflet and your prescriber.
Worked example
1000 IU = 25 µg
Conversion formulas
| mg | mg = µg × 0.001 | µg = mg × 1000 |
|---|---|---|
| IU | IU = µg × 40 | µg = IU × 0.025 |
| ng | ng = µg × 1000 | µg = ng × 0.001 |
Reference range
Doses have no reference range.
Source: DGE (German Nutrition Society): Reference values for vitamin D · Last reviewed: 2026-10-14
Note from the source: Dose conversion only (1 µg = 40 IU = 0.025 µg per IU, DGE table footnote); no reference range.