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Peptide Dosing Unit Converter

Convert between milligrams, micrograms, International Units, and insulin syringe units. Enter a value in any field and see the equivalents instantly — no guesswork, no math mistakes.

Weight Conversion

The most common source of dosing confusion. Milligrams (mg) and micrograms (mcg) differ by a factor of 1,000. Enter a value in either field to see the conversion.

mg ↔ mcg converter
Milligrams mg
Micrograms mcg
Enter a value above

IU Converter

International Units (IU) are used for certain peptides where biological activity varies by preparation. The conversion factor depends on the specific peptide.

IU ↔ mg / mcg
Peptide select to set conversion factor
Milligrams mg
International Units IU
Select a peptide and enter a value
Note: Most research peptides (BPC-157, ipamorelin, CJC-1295, GHK-Cu, semaglutide) are measured in mg or mcg, not IU. International Units are primarily used for HGH and HCG. If your peptide is dosed in mcg, use the weight converter above instead.

Syringe Units Calculator

Given your reconstituted solution concentration and desired dose, see exactly how many units to draw on a U-100 insulin syringe. Need help with reconstitution? Use our reconstitution calculator.

Enter your values
Peptide vial size mg
Water added mL
Concentration mcg/mL (auto-calculated)
Desired dose mcg
Draw this amount
Enter values to calculate

Quick Reference Table

Common peptide doses with their equivalents in different units. Syringe units assume a standard reconstitution of 5 mg peptide in 2 mL bacteriostatic water (concentration: 2,500 mcg/mL).

Peptide Common Dose In mcg In mg Syringe Units
BPC-157 250 mcg 250 0.25 10 units
TB-500 2.5 mg 2,500 2.5 100 units
Ipamorelin 200 mcg 200 0.2 8 units
CJC-1295 100 mcg 100 0.1 4 units
GHK-Cu 200 mcg 200 0.2 8 units
Semaglutide 0.5 mg 500 0.5 20 units
Tirzepatide 5 mg 5,000 5.0 200 units
AOD-9604 300 mcg 300 0.3 12 units
DSIP 100 mcg 100 0.1 4 units
PT-141 1.75 mg 1,750 1.75 70 units

Syringe units based on 5 mg vial reconstituted with 2 mL bacteriostatic water (2,500 mcg/mL, 25 mcg per unit on a U-100 syringe). Your actual units will differ if you use a different vial size or water volume. For safety information, see our peptide side effects and safety guide.

Understanding peptide dosing units

Peptide doses are expressed in several different units depending on context, and confusing them is one of the most common mistakes people make. Here's what each unit actually means and when it applies.

Milligrams (mg) vs. micrograms (mcg). These are straightforward metric weight units. 1 mg = 1,000 mcg. Peptide vials are typically labeled in milligrams (e.g., a 5 mg vial of BPC-157), while individual doses are usually expressed in micrograms (e.g., 250 mcg per injection). The conversion is simple multiplication or division by 1,000, but getting it wrong means a 1,000x dosing error.

International Units (IU). IU measure biological activity rather than weight. They're used primarily for HGH (1 mg ≈ 3 IU) and HCG, where the relationship between mass and potency can vary by preparation. Most research peptides like BPC-157, TB-500, and ipamorelin are dosed in mcg, not IU. If someone quotes a peptide dose in IU and it isn't HGH or HCG, they're likely confusing IU with insulin syringe units.

Insulin syringe units. This is where most confusion happens. "Units" on an insulin syringe measure volume, not drug quantity. On a standard U-100 syringe, 100 units = 1 mL. Each tick mark is 0.01 mL. The number of syringe units you draw depends entirely on your solution's concentration — which is why you need to know your vial size and how much bacteriostatic water you added. The same "10 units" could be 250 mcg or 500 mcg depending on how you reconstituted.

For a step-by-step walkthrough of the reconstitution process, including sterile technique and water ratios, see our guide to reconstituting peptides. To understand how often to dose based on each peptide's half-life, use the half-life calculator.

Related Tools & Guides

Reconstitution Calculator

Calculate exactly how many syringe units to draw after reconstituting your peptide vial with bacteriostatic water.

Half-Life Calculator

Understand how long a peptide stays active in your system and optimize your dosing schedule.

How to Reconstitute Peptides

Step-by-step guide covering equipment, sterile technique, water ratios, and proper storage after mixing.

Peptide Side Effects & Safety

What the research says about common side effects, contraindications, and how to minimize risk.

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Medical disclaimer: This converter is an educational tool only. It does not constitute medical advice. Always consult a qualified healthcare professional before using any peptide or injectable substance. Verify all calculations independently before use.