Convert mg to insulin units with the human-insulin reference (1 IU ≈ 0.0347 mg), or turn a labeled mg amount into units on a U-100 syringe.
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mg to Insulin Units Formula
The following reference formula applies to pure human insulin. It must not be used as a universal mass-to-unit factor for insulin analogues or total solution mass.
Reverse formula:
Variables:
- IU is the approximate number of insulin units
- mg is the insulin mass in milligrams
- 0.0347 is the reference milligrams of pure human insulin per IU
To calculate insulin units from mg, divide the insulin mass by 0.0347. To convert units back to mg, multiply the number of units by 0.0347.
What is mg to Insulin Units Conversion?
International insulin units express biologic activity, while milligrams describe the physical mass of insulin. Under the standard reference definition for human insulin, 1 IU is approximately equal to 0.0347 mg of pure human insulin activity. This makes it possible to translate a measured insulin mass into an approximate unit count.
Because the relationship is linear, the unit count increases in direct proportion to the mass. For example, 0.347 mg corresponds to about 10 IU, and 3.47 mg corresponds to about 100 IU.
In clinical settings, insulin is usually prescribed directly in units and supplied by concentration, such as U-100, which means 100 units per milliliter. The mg-to-IU relationship is most useful in pharmacology, formulation, and research contexts where insulin mass is specified.
How to Convert mg to Insulin Units?
The following steps outline how to convert a known insulin mass in mg to insulin units.
- First, determine the mass of insulin in milligrams (mg).
- Next, confirm that the pure human-insulin reference relationship 1 IU ≈ 0.0347 mg applies. Use the exact product labeling for insulin analogues.
- Then divide the insulin mass by 0.0347 using the formula IU = mg / 0.0347.
- Finally, review the result and compare it with the calculator above.
mg to Insulin Units Conversion Table
The table below applies the formula IU = mg / 0.0347 to several common insulin masses. Values are rounded to two decimal places where needed.
| Insulin Mass | Approximate Units (IU) |
|---|---|
| 0.0347 mg | 1 IU |
| 0.0694 mg | 2 IU |
| 0.347 mg | 10 IU |
| 3.47 mg | 100 IU |
| 34.7 mg | 1000 IU |
| 50 mg | 1440.92 IU |
This table is an approximate pure human-insulin reference conversion, based on the specific activity stated for NIBSC human-insulin standard 11/212. It is not a dose table. Product units and physical syringe markings must be distinguished; follow the exact product labeling and prescribed device.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Insulin Mass (mg) = 10
Insulin Units (IU) = 10 / 0.0347 = 288.18
