How do you convert IU to mg for peptides?

The conversion between IU and mg varies by peptide because IU is a measure of biological activity, not mass. For HCG, 1 mg ≈ 10,000 IU. For HGH, 1 mg ≈ 3 IU. For insulin, 1 mg ≈ 26.11 IU. Always check the specific conversion factor for your peptide.

What is the difference between mL and units on a syringe?

On a standard insulin syringe, 1 mL = 100 units. A 0.5 mL syringe has 50 units, and a 0.3 mL syringe has 30 units. Units are simply a more granular way to measure small volumes on an insulin syringe.

Peptide Unit Converter

Instantly convert between milligrams, micrograms, international units, milliliters, and syringe units.

Mass Conversion (mg ↔ mcg)

Milligrams (mg)

Micrograms (mcg)

1 mg = 1,000 mcg

Volume Conversion (mL ↔ Syringe Units)

Milliliters (mL)

Syringe Units (insulin syringe)

1 mL = 100 units (standard insulin syringe)

IU Conversion (IU ↔ mg)

Select Peptide

International Units (IU)

Milligrams (mg)

Conversion factor: 3 IU per mg (HGH)

Quick Reference

From	To	Multiply By
mg	mcg	× 1,000
mcg	mg	÷ 1,000
mL	Syringe units	× 100
Syringe units	mL	÷ 100
mg HGH	IU	× 3
mg HCG	IU	× 10,000
mg Insulin	IU	× 26.11

Understanding Peptide Measurement Units

Peptide dosing involves multiple measurement systems that can be confusing. Milligrams (mg) and micrograms (mcg or μg) measure mass — how much peptide there is. Milliliters (mL) measure volume — how much liquid you inject. International Units (IU) measure biological activity — how potent the peptide is. Syringe units are markings on insulin syringes that correspond to volume.

The most common source of dosing errors is confusing mg and mcg. One milligram equals one thousand micrograms. So a 250 mcg dose of BPC-157 is 0.25 mg — not 250 mg. Always double-check which unit a protocol is using before calculating your dose.

IU Conversions for Common Peptides

International Units (IU) measure a substance's biological effect rather than its mass. The same mass of two different peptides can have vastly different IU values because potency varies. This is why IU-to-mg conversion factors are specific to each compound.

For HGH (Human Growth Hormone), the standard conversion is 1 mg = 3 IU. A typical daily dose of 2 IU equals approximately 0.67 mg. For HCG (Human Chorionic Gonadotropin), 1 mg = approximately 10,000 IU. A typical HCG dose of 500 IU equals 0.05 mg. For Insulin, 1 mg = 26.11 IU (WHO standard for human insulin).

Frequently Asked Questions

How many mcg are in a mg?

There are 1,000 micrograms (mcg) in 1 milligram (mg). To convert mg to mcg, multiply by 1,000. For example, 0.25 mg = 250 mcg. To convert mcg to mg, divide by 1,000.

What does "units" mean on an insulin syringe?

On a standard insulin syringe, "units" are volume markings where 100 units = 1 mL. A 0.5 mL syringe has 50 units, and a 0.3 mL syringe has 30 units. These units have nothing to do with IU (International Units) — they are purely a volume measurement specific to insulin syringes.

How do I convert IU to mg?

Divide the IU value by the conversion factor for your specific peptide. For HGH: IU ÷ 3 = mg. For HCG: IU ÷ 10,000 = mg. For Insulin: IU ÷ 26.11 = mg. The conversion factor varies by peptide because IU measures biological activity, not mass.