Somatropin 1 IU to mg conversion
A somatropin-specific HGH calculator for converting international units (IU) to milligrams (mg) and micrograms (mcg). This is for unit conversion only, not dose selection.
Using the common recombinant HGH / somatropin standard, 1 mg = 3 IU. So 1 IU = 0.333 mg = 333 mcg. Product labels can vary slightly; always use the potency on the label you actually have.
Quick HGH IU to mg table
| Somatropin IU | Approx mg | Approx mcg |
|---|---|---|
| 1 IU | 0.333 mg | 333 mcg |
| 2 IU | 0.667 mg | 667 mcg |
| 3 IU | 1.000 mg | 1,000 mcg |
| 4 IU | 1.333 mg | 1,333 mcg |
| 5 IU | 1.667 mg | 1,667 mcg |
| 10 IU | 3.333 mg | 3,333 mcg |
| 15 IU | 5.000 mg | 5,000 mcg |
The formula is simple: mg = IU / 3, then mcg = mg x 1,000. To go the other direction, IU = mg x 3.
Why HGH uses IU
International units are used for some biologic drugs because activity matters, not just powder mass. For recombinant human growth hormone, the common reference conversion is 3 IU per 1 mg of somatropin. Product-specific labeling should override any generic calculator.
For ongoing protocol math, use the broader peptide dose converter or the HGH reconstitution calculator.
FAQ
How many mg is 1 IU of HGH?
Using the common somatropin conversion, 1 IU is about 0.333 mg, or 333 mcg.
How many IU are in 1 mg of somatropin?
1 mg of recombinant HGH / somatropin is commonly treated as about 3 IU. Check the product label because specific preparations may differ.
Can I convert HGH IU directly to syringe units?
No. First convert IU to mg if needed, then use your reconstituted concentration to convert mg to ml and syringe units.
Sources
- Second International Standard for Somatropin - reports WHO agreement on 3.0 IU/mg specific activity.
- NCBI Bookshelf somatropin product table - notes biological activity as 3 IU = 1 mg when reported.
- FDA somatropin information - safety and regulatory context for somatropin products.