Peptide Calculator
Concentration, volume, and U-100 units from the values you already know.
How this peptide calculator works
Enter the vial amount, diluent volume, and a known target amount. The calculator first finds concentration by dividing the amount in the vial by the diluent volume. It then converts the known target amount into a draw volume and maps that volume to U-100 syringe units.
Formula
Concentration (mg/mL) = peptide amount (mg) / diluent volume (mL) Target amount (mg) = target amount (mcg) / 1000 Draw volume (mL) = target amount (mg) / concentration (mg/mL) U-100 units = draw volume (mL) * 100 Amount per U-100 unit (mcg/unit) = concentration (mcg/mL) / 100
Example calculation
For example, a 5 mg vial mixed with 2 mL has a concentration of 2.5 mg/mL. A known target amount of 250 mcg is 0.25 mg. Dividing 0.25 mg by 2.5 mg/mL gives 0.10 mL, which equals 10 units on a U-100 syringe.
Common mistakes
The most common math mistakes are mixing up mg and mcg, treating U-100 units as a mass unit, and forgetting that concentration changes when diluent volume changes. Always verify the vial amount, diluent volume, target amount, and unit labels before using any result.
Common peptide calculation examples
| Vial | Diluent | Amount | Concentration | Draw volume | U-100 units | Portions/vial |
|---|---|---|---|---|---|---|
| 5 mg | 2 mL | 250 mcg | 2.5 mg/mL | 0.10 mL | 10 units | 20 |
| 10 mg | 2 mL | 500 mcg | 5 mg/mL | 0.10 mL | 10 units | 20 |
| 10 mg | 2.5 mL | 250 mcg | 4 mg/mL | 0.0625 mL | 6.25 units | 40 |
| 15 mg | 3 mL | 500 mcg | 5 mg/mL | 0.10 mL | 10 units | 30 |
| 20 mg | 4 mL | 1 mg | 5 mg/mL | 0.20 mL | 20 units | 20 |
| 30 mg | 3 mL | 1 mg | 10 mg/mL | 0.10 mL | 10 units | 30 |
mg to mcg and syringe-unit reminders
Peptide calculation references
Frequently Asked Questions
Is this calculator a dosage recommendation?
No. This calculator only converts a known target amount into concentration, draw volume, and U-100 units based on the numbers you enter. It does not choose an amount, check whether an amount is appropriate, or replace guidance from a qualified professional.
What are U-100 syringe units?
U-100 units are a volume scale. On a U-100 syringe, 100 units equals 1 mL, so 10 units equals 0.10 mL. Units do not directly equal mg or mcg unless you also know the concentration of the solution.
How do I convert mg to mcg?
Multiply milligrams by 1000 to get micrograms. For example, 0.25 mg equals 250 mcg, and 1 mg equals 1000 mcg. This conversion is used before calculating draw volume from concentration.
What does peptide reconstitution mean?
Reconstitution means combining a dry vial amount with a measured diluent volume. The math result is concentration, usually shown as mg per mL or mcg per mL. The calculator then uses that concentration with your known target amount.
Why do syringe units depend on concentration?
Syringe units measure volume, not mass. The same 10 units can contain different mcg amounts when the vial amount or diluent volume changes. That is why concentration must be calculated before units can be interpreted.
This calculator is for educational math conversion only. It does not prescribe, verify, or select any peptide amount. Always follow guidance from a qualified healthcare professional.