Convert substance-specific IU, or verified semaglutide/medication syringe markings, to mg. Syringe conversions require the actual concentration and device markings per mL; they do not determine a safe dose.
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Units to mg Formula
The following formula converts International Units (IU) to mass for a specified substance, or to the stated nutritional alpha-tocopherol activity for vitamin E.
Variables:
- mg is the mass in milligrams, or vitamin E nutritional label activity where stated
- units is the quantity in International Units (IU)
- mg per unit is the conversion factor for the selected substance
To calculate milligrams from units, multiply the number of units by the correct mg-per-unit conversion factor for that vitamin, hormone, or drug.
What is Units to mg Conversion?
Units to mg conversion is the process of changing a value expressed in International Units into an equivalent mass in milligrams. International Units measure biological activity rather than physical weight, which means the conversion depends entirely on the specific substance being measured. Because of this, 1000 IU of vitamin D does not equal the same number of milligrams as 1000 IU of vitamin E or insulin.
Common examples include vitamin Dโ, vitamin A, vitamin E, and insulin. Each has a standard IU definition that determines how much actual mass corresponds to one unit. Once that factor is known, the conversion is straightforward.
Common Units to mg Conversion Factors
- Vitamin Dโ (cholecalciferol): 1 IU โ 0.000025 mg
- Vitamin A (retinol): 1 IU โ 0.0003 mg
- Supplemental vitamin A (ฮฒ-carotene): 1 IU โ 0.0006 mg ฮฒ-carotene (0.0003 mg RAE)
- Vitamin E (natural source): 1 IU โ 0.67 mg alpha-tocopherol label activity
- Vitamin E (synthetic source): 1 IU โ 0.45 mg alpha-tocopherol label activity, not total synthetic ingredient mass
- Pure human insulin reference standard: 1 IU โ 0.0347 mg; excludes analogs, product solution mass and syringe markings
How to Convert Units to mg?
The following steps outline how to convert units into milligrams.
- First, determine the value in units (IU).
- Select International Units and identify the exact substance and conversion basis.
- Find the correct mg-per-unit conversion factor for that substance.
- Multiply the units by the mg-per-unit factor using the formula mg = units ร (mg per unit).
- Check your answer with the calculator above.
Example Problem :
Convert 1000 IU of vitamin Dโ into milligrams.
Units = 1000 IU
Conversion Factor = 0.000025 mg per IU
mg = 1000 ร 0.000025 = 0.025 mg
Units to mg Conversion Table
The table below shows example conversions for 1000 IU of several common substances.
| Substance | Approx. mg per 1 IU | 1000 IU: mass or stated activity |
|---|---|---|
| Vitamin Dโ (cholecalciferol) | 0.000025 mg | 0.025 mg |
| Vitamin A (retinol) | 0.0003 mg | 0.3 mg |
| Supplemental ฮฒ-carotene mass, not RAE | 0.0006 mg | 0.6 mg |
| Vitamin E (natural label activity) | 0.67 mg activity | 670 mg activity |
| Vitamin E (synthetic label activity) | 0.45 mg activity | 450 mg activity |
| Pure human insulin reference standard | 0.0347 mg | 34.7 mg |
Always verify the exact substance and standard. The vitamin E factors above give U.S. nutritional label activity; 0.45 mg synthetic activity is not the total mass of a synthetic ingredient or ester. Retinol and ฮฒ-carotene mass must not be confused with retinyl ester mass or food-based RAE. For syringe markings, volume = markings รท actual markings per mL and mass = volume ร verified mg/mL. Confirm the concentration, device and prescribed amount with the dispensing pharmacist; do not use pen clicks or guessed concentrations.
