What Is a Peptide Calculator?
A peptide calculator (also called a peptide reconstitution calculator) helps you work out how much bacteriostatic water to add to a lyophilized (freeze-dried) peptide vial and exactly how many units to draw on an insulin syringe to hit a target dose. Because research peptides are supplied as a dry powder measured in milligrams while syringes are marked in units, getting the conversion right is essential for consistent, accurate dosing.
This tool removes the error-prone manual math: enter the total peptide in the vial, the volume of reconstitution fluid you plan to add, and your desired dose, and it returns the concentration and the number of insulin-syringe units to draw.
How to Use the Peptide Calculator
- Peptide amount — the total milligrams (or micrograms) of peptide in the vial, shown on the label.
- Bacteriostatic water — the volume of reconstitution fluid you will add, in milliliters.
- Desired dose — the amount of peptide you want per injection.
- Calculate — the tool shows the concentration (per mL) and the exact units to draw on a standard U-100 insulin syringe.
How Reconstitution Math Works
The concentration is the peptide amount divided by the water volume. On a U-100 insulin syringe, 100 units equals 1 mL, so units to draw equals (desired dose ÷ concentration) × 100. For example, a 5 mg vial reconstituted with 2 mL gives 2.5 mg/mL; a 0.25 mg dose is 0.1 mL, which is 10 units on the syringe.
Reconstitution Reference
| Vial Amount | Water Added | Concentration | Units for 250 mcg |
|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 5 units |
| 5 mg | 2 mL | 2.5 mg/mL | 10 units |
| 10 mg | 2 mL | 5 mg/mL | 5 units |
| 10 mg | 5 mL | 2 mg/mL | 12.5 units |
Tips for Accurate Dosing
- More water means a lower concentration and a larger, easier-to-measure volume per dose.
- A U-100 insulin syringe reads 100 units per 1 mL — always confirm your syringe type.
- Add reconstitution fluid slowly down the vial wall; do not shake vigorously.
- Keep units and milligrams consistent (convert mg to mcg where needed: 1 mg = 1000 mcg).
Note: This calculator is an informational tool for research and educational purposes. Always follow professional medical guidance for any substance intended for human use.
Frequently Asked Questions
How do I reconstitute a peptide?
Add the chosen volume of bacteriostatic water to the powder vial, letting it run down the side rather than directly onto the powder, then gently swirl until fully dissolved. The calculator tells you the resulting concentration.
How many units should I draw on an insulin syringe?
Units to draw = (desired dose ÷ concentration) × 100 for a U-100 syringe. The calculator computes this automatically once you enter the vial amount, water volume, and dose.
How much bacteriostatic water should I add?
There is no single correct volume — more water gives a lower concentration and a larger, easier-to-measure dose. Common choices are 1 mL, 2 mL, or 5 mL; the calculator shows the concentration for whatever you choose.
What is the difference between mg and mcg?
One milligram (mg) equals 1,000 micrograms (mcg). Many peptide doses are listed in mcg while vials are labeled in mg, so converting carefully matters.
Is this peptide calculator free?
Yes — it is completely free, requires no signup, and works on any device.