Vitamin D Converter
Convert international units (IU) to micrograms for supplement comparison.
Use the calculator below, then review the formula, a numeric example, and the reference table to understand how the vitamin d unit converter result is produced.
Educational tool only. It does not replace advice from a licensed clinician, dietitian, or exercise physiologist.
Calculator inputs
Result
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What is this calculator?
Convert international units (IU) to micrograms for supplement comparison. The formula, a worked example, and a reference table are below. Results are for education only, not medical advice.
How it works
Common cholecalciferol rule: micrograms (µg) = International Units (IU) ÷ 40.
Example
2000 IU → 2000 ÷ 40 = 50 µg.
Reference Table
| Value | Meaning |
|---|---|
| D2 vs D3 | Potency and testing differ |
| Labs | 25(OH)D interpretation is clinical |
| Toxicity | High doses need monitoring |
FAQ
Is IU universal?
Different vitamins use different IU definitions.
Sun exposure?
Skin synthesis varies by latitude, season, and skin tone.
Malabsorption?
Dosing differs in GI disease; clinician-directed.
Pregnancy?
Use prenatal guidance for supplementation.