Vitamina D UI
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
μg × 40 = UI
About this calculator
The Vitamin D IU Converter helps translate micrograms (μg) into International Units (IU) based on the standard conversion rate recognized by the World Health Organization (WHO). This is essential for understanding daily recommended intake or interpreting supplement dosages. The formula used is straightforward: multiply the μg value by 40 to obtain the equivalent in IU.
This tool is particularly useful for individuals tracking vitamin D levels, whether to address deficiencies, strengthen bones, or support immune health. For example, a vitamin D3 capsule labeled 10 μg corresponds to 400 IU. This clarifies how to adjust doses based on blood test results or medical recommendations.
Remember that vitamin D can be obtained through sunlight exposure and foods like eggs, salmon, and fortified milk. While this calculator provides a quick conversion, consulting a healthcare provider ensures personalized guidance, considering factors like age, gender, and health conditions.
Excessive vitamin D intake can lead to hypervitaminosis, with symptoms such as nausea, kidney stones, and calcium imbalance. Always consult a doctor before increasing supplementation to ensure safe levels.
Frequently asked questions
Why multiply by 40 to convert μg to IU?
The 1 μg = 40 IU ratio is an international standard set by health authorities to ensure consistency in vitamin D dosing across medications and supplements.
Is it safe to adjust supplement doses using this calculator?
No, this tool provides calculations only. Consult a healthcare provider to determine appropriate dosing based on blood tests and health history.
How do I use this to read food labels?
Enter the μg value listed on the label. For example, 5 μg in yogurt equals 200 IU, helping you compare to daily needs.
Does the calculator account for vitamin D2 or D3?
The tool assumes D3 conversion (most common in supplements). While D2 and D3 have similar efficacy, consult a doctor to discuss differences.