Calculator Inputs
Form selection matters because natural and synthetic vitamin E do not share the same IU potency.
Plotly Conversion Graph
Example Data Table
| Input (mcg) | Form | Equivalent mg | Converted IU |
|---|---|---|---|
| 67 | Natural | 6.7 | 10 |
| 15 | Natural | 15 | 22.39 |
| 201 | Natural | 20.1 | 30 |
| 45 | Synthetic | 4.5 | 10 |
| 1 | Synthetic | 10 | 22.22 |
| 1575 | Synthetic | 15.75 | 35 |
Formula Used
Natural vitamin E: IU = (mcg ÷ 1000) ÷ 0.67
Synthetic vitamin E: IU = (mcg ÷ 1000) ÷ 0.45
Reverse natural conversion: mcg = IU × 0.67 × 1000
Reverse synthetic conversion: mcg = IU × 0.45 × 1000
The tool also shows mg alpha-tocopherol equivalent. That value helps compare labels and estimate Daily Value percentage.
Use natural form for d-alpha or RRR-alpha labels. Use synthetic form for dl-alpha or all-rac labels.
How to Use This Calculator
- Enter the vitamin E amount in the input field.
- Select the conversion mode that matches your label.
- Choose natural or synthetic vitamin E form carefully.
- Set the decimal precision you want displayed.
- Click Calculate to show the result above the form.
- Review IU, mg equivalent, and Daily Value percentage.
- Use the graph to inspect how values scale.
- Download the current result as CSV or PDF.
Frequently Asked Questions
1. Why does vitamin E need form selection?
Natural and synthetic vitamin E have different biological potency. The same IU value does not equal the same microgram or milligram amount across both forms.
2. Is mcg the same as mg?
No. One milligram equals 1,000 micrograms. This calculator automatically handles that step before applying the IU conversion factor.
3. Which form is usually stronger per IU?
Natural vitamin E is stronger per IU. That means fewer IU are needed to match the same milligram amount of alpha-tocopherol.
4. Can I convert IU back to mcg here?
Yes. Choose IU to mcg or IU to mg in the conversion menu. The calculator supports both forward and reverse calculations.
5. What does mg equivalent mean?
It means milligrams of alpha-tocopherol represented by the chosen amount. This value is useful for label comparison and Daily Value estimates.
6. Why is the Daily Value percentage included?
It gives quick context for the calculated milligram amount. You can compare one serving with the common 15 mg reference value.
7. Does this work for mixed tocopherols?
Only use it when the label provides alpha-tocopherol based information. Mixed tocopherols may not convert cleanly with a single IU factor.
8. Is this calculator a medical recommendation?
No. It is an educational conversion tool. Use product labels and healthcare guidance for supplementation decisions, especially at higher doses.