Peptide amounts are quoted in milligrams (mg), micrograms (mcg) and sometimes international units (IU). This converter moves between metric mass units instantly, and — when you supply a conversion factor — estimates IU.
Metric conversions are fixed
| Unit | Equals |
|---|---|
| 1 mg | 1,000 mcg |
| 1 mcg | 1,000 ng |
| 1 mg | 1,000,000 ng |
IU is not a mass unit
International units measure biological activity, not weight, so there is no universal mg ↔ IU conversion. Each substance has its own factor, usually printed on the vial or certificate of analysis. Enter that factor (mg per IU) and the tool will estimate IU alongside the mass conversion.