Peptide Calculator (concentration, volume and syringe units)

Worked example

Example: 10 mg vial + 2 mL → 5 mg/mL; 0.25 mg ÷ 5 = 0.05 mL = 5 units.

How it works

1. 1. Concentration

   Divide the vial content (mg) by the diluent volume (mL) to get mg/mL.

2. 2. Volume

   Divide the amount you need (mg) by the concentration to get mL.

3. 3. Syringe units

   Multiply mL by 100 for units on a U-100 syringe.

Frequently asked questions

Sources

1. Reconstitution, units and concentration arithmetic: see our lab-handling guide, The Peptide Directory

Label and trial dose references

For doses as printed in FDA labels or used in trials, see the peptide dose reference and the protocol pages.

Related tools

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• Titration Vial PlannerFour steps of 4 uses at 0.25, 0.5, 1 and 1.7 mg total 13.8 mg, which is two 10 mg vials (rounded up).
• Units ConverterAt 2.5 mg/mL, 0.5 mg is 0.2 mL — 20 units on a U-100 syringe.
• Semaglutide Units ConverterAt a concentration of 2.5 mg/mL, 0.25 mg of semaglutide is 0.1 mL, which is 10 units on a U-100 syringe.
• Tirzepatide Units ConverterAt 10 mg/mL, 2.5 mg of tirzepatide is 0.25 mL, which is 25 units on a U-100 syringe.
• Semaglutide Reconstitution CalculatorA 5 mg semaglutide vial reconstituted with 2 mL of diluent has a concentration of 2.5 mg/mL.
• Tirzepatide Reconstitution CalculatorA 30 mg tirzepatide vial reconstituted with 3 mL of diluent has a concentration of 10 mg/mL.
• Retatrutide CalculatorA 10 mg retatrutide vial with 2 mL of diluent is 5 mg/mL, so 1 mg is 0.2 mL — 20 units on a U-100 syringe.
• BAC Water CalculatorTo make 5 mg/mL from a 10 mg vial, add 2 mL of bacteriostatic water (10 ÷ 5 = 2).