Vitamin IU Converter: A, D, E, Folate and Niacin (FDA Factors)
Vitamin units converted by FDA's labeling factors.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Vitamin and form
- Vitamin D (D2 or D3)
- Direction
- From IU to metric
- Amount
- 2000
Result: 2,000 IU of vitamin D × 0.025 = 50 mcg, which is 250% of the Daily Value of 20 mcg.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Vitamin and form
- Direction (vitamins A, D and E)
- Amount (IU or metric; for folate, mcg of food folate; for niacin, mg of niacin)
- Folate: mcg of folic acid.
Full field descriptions
- Folate: mcg of folic acid. Niacin: mg of tryptophan
How this is calculated
Citation
FDA. Converting Units of Measure for Folate, Niacin, and Vitamins A, D, and E on the Nutrition and Supplement Facts Labels: Guidance for Industry. August 2019 (Tables 1, 3 and 6). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.