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Peptide dose & unit converter
Convert a peptide dose between micrograms (mcg), milligrams (mg), and IU — and see which unit each kind of compound is measured in.
Your amount
Example numbersThe same amount
- IU · HGH only
- 0.75 IU
1 mg = 1,000 mcg. The IU figure applies only to HGH (somatropin), where the WHO standard is ~3 IU per mg — it is not valid for other peptides, which are dosed by mass.
Which unit does my peptide use?
Most research peptides are dosed in micrograms (mcg) or milligrams (mg) — BPC-157, TB-500, GHK-Cu, and the GH secretagogues (ipamorelin, CJC-1295) are all measured by mass. GLP-1 compounds like semaglutide and tirzepatide are dosed in mg.
IU (international units) only applies to HGH, where potency historically came from a biological standard rather than mass. For everything else, ignore IU.
The fourth number people confuse — units on a syringe — isn't a dose at all; it's a volume mark that depends on how you reconstituted the vial. To turn a dose into the units you draw, use the reconstitution calculator.
Example: 250 mcg is 0.25 mg, and for HGH only, 0.25 mg is 0.75 IU.
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