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June 4, 2026
Peptide Reconstitution Calculator: Dose, Concentration & Syringe Units
June 4, 2026
Reconstituting a peptide vial by hand means turning three or four numbers into a single, exact amount to draw — and the underlying arithmetic is easy to get wrong by hand. This free peptide reconstitution calculator helps with the arithmetic. Enter your vial size in milligrams, the volume of bacteriostatic (BAC) water you added, and your target dose, and it instantly returns your concentration in mg/mL, the corresponding volume in milliliters, and the matching number of units on a standard U-100 insulin syringe. Every field is solvable from the others, so you can enter any combination you know and let the tool fill in the rest. If you are exploring a protocol, our team can also guide you through medically supervised peptide therapy. Like this tool? Check out our Longevity Assessment.
Longevity Centers of America
Peptide Reconstitution Calculator
Enter what you know — we solve the rest.
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Result
Fill in the vial size and BAC water (or a concentration), plus a dose or unit amount, and your draw will appear here.
Units assume a standard U-100 insulin syringe (1 mL = 100 units). The draw volume in mL is shown so you can use any syringe.
For educational and clinical reference use only. This calculator performs arithmetic and does not provide dosing recommendations or medical advice. All calculations and reconstitution must be independently verified and performed by a qualified, licensed healthcare professional. These statements have not been evaluated by the FDA. Our therapies are designed to support general wellness and nutritional status, not to diagnose, prevent, or address specific diseases or medical conditions. Consult with your healthcare provider before beginning any new wellness protocols.
How to Use the Peptide Reconstitution Calculator
Start with what is printed on your vial and what you plan to inject. Enter the peptide in the vial (milligrams) and the amount of BAC water (milliliters) you added — the calculator immediately shows the resulting concentration. Then enter your target dose (in micrograms or milligrams) or the units you want on the syringe, and the tool displays the corresponding draw amount, in both insulin units and milliliters. You can also work backward: type a concentration directly, or enter units and dose to solve for the concentration. The quick-fill chips for common vial sizes (5, 10, 15, 30 mg) and water volumes (1–5 mL) make setup even faster.
The Reconstitution Math, Explained
Peptide dosing comes down to one core relationship: concentration equals the amount of peptide divided by the volume of liquid you dissolved it in. Once you know the concentration, every other number follows.
- Concentration (mg/mL) = peptide in vial (mg) ÷ BAC water (mL)
- Draw volume (mL) = target dose (mg) ÷ concentration (mg/mL)
- Units (U-100) = draw volume (mL) × 100
For example, a 10 mg vial reconstituted with 2 mL of BAC water gives a concentration of 5 mg/mL. A 250 mcg (0.25 mg) dose then works out to 0.05 mL, which is 5 units on a U-100 insulin syringe — and that 10 mg vial yields about 40 doses. The calculator runs this same arithmetic instantly so you never have to do it on paper.
Understanding BAC Water and Concentration
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol, which suppresses bacterial growth and allows a reconstituted vial to be used across multiple injections (see the NIH DailyMed reference for product details). The volume you add does not change the total amount of peptide in the vial — only how concentrated it is. Adding more water makes a more dilute solution, so each dose requires drawing a larger, easier-to-measure volume; adding less water makes a more concentrated solution, so each dose is a smaller volume. The calculator can illustrate how different water volumes change the resulting concentration; any reconstitution and dosing decisions should be made and carried out by a qualified, licensed healthcare professional.
Reading Units on a U-100 Insulin Syringe
A standard U-100 insulin syringe is calibrated so that 1 mL equals 100 units. That means 0.1 mL is 10 units, 0.5 mL is 50 units, and a full 1 mL syringe holds 100 units. The calculator reports your draw in units because that is what most people actually read off the barrel, but it also shows the equivalent volume in milliliters so the result works with any syringe size you happen to be using.
Frequently Asked Questions
How do I calculate peptide dosage from a reconstituted vial?
Divide the peptide amount in the vial (mg) by the volume of BAC water you added (mL) to get the concentration in mg/mL. Then divide your target dose (in mg) by that concentration to get the volume to draw, and multiply that volume by 100 to get the number of units on a U-100 syringe. The calculator above performs all three steps automatically.
How much bacteriostatic water should I add to a peptide vial?
There is no single required amount — the volume of BAC water only sets the concentration, not the total peptide. The appropriate volume should be determined by a qualified, licensed healthcare professional. The goal is to pick a volume that makes your usual dose land on a convenient, easy-to-read unit mark. Enter different water amounts into the calculator to see which gives you the cleanest draw.
What does U-100 mean on an insulin syringe?
U-100 means the syringe is calibrated for 100 units per milliliter. So 100 units equals 1 mL, 50 units equals 0.5 mL, and 10 units equals 0.1 mL. This is the most common insulin syringe standard and is what the calculator uses to convert your draw volume into units.
How many doses are in a peptide vial?
Divide the total peptide in the vial by your per-injection dose. For instance, a 10 mg vial with a 250 mcg (0.25 mg) dose contains roughly 40 doses. The calculator shows a “doses per vial” figure automatically once you enter the vial size and your dose.
Can I change my dose without re-mixing the vial?
Yes. Once a vial is reconstituted, its concentration is fixed, but you can draw any dose you like by adjusting the volume (and therefore the units) you pull into the syringe. Enter the new target dose in the calculator and it will show the updated units and milliliters to draw.
For educational and clinical reference only. This calculator performs arithmetic and is not medical advice. Always have reconstitution and dosing independently verified by a qualified, licensed healthcare professional.
Dr. Benjamin Kosubevsky, D.O., is a board-certified physician specializing in regenerative and integrative medicine. A graduate of Lake Erie College of Osteopathic Medicine, he combines treatments like PRP Therapy and Osteopathic Manipulative Treatment (OMT) to promote holistic wellness. Dr. Kosubevsky is also committed to advancing the future of medicine by mentoring and training medical students from Burrell College of Osteopathic Medicine in regenerative, integrative, and patient-centered care. He is also known for developing customized Ozone Dialysis (EBOO) protocols that enhance treatment efficiency and patient outcomes.
About Dr. Benjamin Kosubevsky, D.O.
