Enter your vial size, how much bacteriostatic water you added, and your target dose — get the concentration, the insulin-syringe units to draw, and how many doses your vial holds.
Read this first: this calculator is a math tool for education only — not medical advice, and not a dosing recommendation.
It only converts the numbers you type. It cannot tell you whether a compound, dose, or route is appropriate for you — talk to a qualified clinician before making any dosing decisions.
The units to draw are the same whichever syringe barrel you pick — a U-100 unit is always 0.01 mL. Smaller barrels just have finer markings, which makes small doses easier to measure accurately.
Worked example. 5 mg vial + 2 mL BAC water = 2.5 mg/mL. A 250 mcg (0.25 mg) dose needs 0.25 ÷ 2.5 = 0.1 mL = 10 units, and the vial holds 20 doses.
Add BAC water slowly down the side of the vial; swirl gently, never shake.
Use the calculator above with your actual vial size and water volume.
Write the date and concentration on the vial so future-you isn't guessing.
Only proceed as directed by a qualified clinician — this tool can't replace one.
Popular mixing ratios people use, and what each works out to. These are examples of the math — not recommendations:
| Vial | BAC water | Concentration | Example dose | Units to draw |
|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 250 mcg | 5 |
| 5 mg | 2 mL | 2.5 mg/mL | 250 mcg | 10 |
| 10 mg | 2 mL | 5 mg/mL | 500 mcg | 10 |
| 10 mg | 3 mL | 3.33 mg/mL | 1 mg | 30 |
| 15 mg | 3 mL | 5 mg/mL | 1 mg | 20 |
| 30 mg | 3 mL | 10 mg/mL | 2 mg | 20 |
1 mg = 1,000 mcg. So a 250 mcg dose is 0.25 mg — the toggle above converts for you.
No. All U-100 syringes use the same unit — 0.01 mL — so 10 units is 10 units on any barrel. A 0.3 mL syringe just has bigger, finer markings that make small doses easier to read.
No — it only dilutes the concentration. The same mg dose just becomes a larger volume (more units) to draw. More water can make small doses easier to measure.
Commonly cited practice for research contexts is refrigeration after reconstitution. Stability varies by compound — check sources for the specific peptide, and see our sourcing & safety guide.