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Peptide Calculator
Your peptide vial
Works for any peptide vial: pick a common peptide or add your own, then enter your water and dose. 1 mg = 1,000 mcg.
Estimate only, not medical advice. Peptides are research compounds; dosing must come from a licensed clinician.
Example: a 5 mg vial of BPC-157 with 2 mL of water is 2,500 mcg/mL, so a 250 mcg dose is 0.10 mL — 10 units on an insulin syringe — with 20 doses per vial.
Behind the numbers
How peptide dosing is calculated
Every peptide vial follows the same reconstitution math. The dry powder in the vial is measured in milligrams; adding bacteriostatic water dissolves it into a solution, and the concentration — micrograms per millilitre — is what links your dose to the volume you draw. Once you know the concentration, divide your dose in mcg by the mcg per mL to get the volume in mL, then multiply by 100 for insulin syringe units.
5 mg × 1,000 ÷ 2 mL = 2,500 mcg/mL. Then 250 mcg ÷ 2,500 mcg/mL = 0.10 mL, and 0.10 mL × 100 = 10 units.
A few comparisons
Example doses
| Vial | Water | Dose | Concentration | Volume | Units | Doses per vial |
|---|---|---|---|---|---|---|
| 5 mg | 2 mL | 250 mcg | 2,500 mcg/mL | 0.10 mL | 10 | 20 |
| 5 mg | 2 mL | 500 mcg | 2,500 mcg/mL | 0.20 mL | 20 | 10 |
| 10 mg | 2 mL | 250 mcg | 5,000 mcg/mL | 0.05 mL | 5 | 40 |
| 5 mg | 3 mL | 250 mcg | 1,667 mcg/mL | 0.15 mL | 15 | 20 |
| 10 mg | 3 mL | 500 mcg | 3,333 mcg/mL | 0.15 mL | 15 | 20 |
Measure twice, draw once.
If your peptide is not in the list, choose “Add your own peptide…” and type its name and vial size — the calculator uses your numbers exactly.
More water means a lower concentration and a larger draw for the same dose, which can make small doses easier to measure accurately.
On an insulin syringe, 100 units = 1 mL. A 0.10 mL dose is 10 units; mixing up units and millilitres is the most common measuring mistake.
Keep the reconstituted vial refrigerated and follow your supplier’s storage guidance, and never use a dose worked out here without a licensed clinician’s direction.
Good to know
Your dosage questions, answered.
What peptides does this calculator work for?
Any peptide that comes as a powder in a vial — BPC-157, TB-500, CJC-1295, Ipamorelin, PT-141, Sermorelin and others. Pick one from the list, or choose “Add your own peptide…” and type its name and vial size; the math is the same for all of them.
How is the concentration calculated?
Vial amount in mg × 1,000 ÷ water in mL. For example, 5 mg in 2 mL is 5 × 1,000 ÷ 2 = 2,500 mcg/mL. Divide your dose in mcg by that concentration to get the volume in mL.
What is an insulin unit?
On a standard 1 mL insulin syringe, 100 units equals 1 mL, so 1 unit is 0.01 mL. A 0.10 mL dose is 10 units. Always confirm which syringe you have before drawing a dose.
Is this medical advice?
No. This page is an estimate only, not medical advice. Peptides are research compounds; dosing must come from a licensed clinician.