Draw Volume
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Educational Use Only. This calculator is for informational purposes and does not constitute medical advice. Always consult a qualified healthcare professional.
mg
Total peptide in the lyophilized vial — check your label.
Please enter a valid vial size greater than 0.
ml
Volume of BAC water used to reconstitute. Use our BAC Water Calculator to find this.
Please enter a valid water volume greater than 0.
mcg
Target dose in micrograms. 1 mg = 1,000 mcg.
Please enter a valid dose greater than 0.
Concentration
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mcg / ml
Volume (ml)
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milliliters
💉 Syringe Visualization
Fill to — IU
0 IU25 IU50 IU75 IU100 IU
U-100 insulin syringe · 100 IU = 1.0 ml · each IU = 0.01 ml
How the Calculation Works
The peptide dosage formula converts your desired micogram dose into a practical syringe volume in three steps.
Step 1 — Concentration
Concentration (mcg/ml) = (Vial mg × 1000) ÷ BAC Water (ml)
Step 2 — Volume in ml
Volume (ml) = Desired Dose (mcg) ÷ Concentration (mcg/ml)
Step 3 — Syringe Units (IU)
IU = Volume (ml) × 100 ← U-100 syringe scale
Worked Example
5 mg vial + 2 ml BAC water + 250 mcg dose:
| Step | Calculation | Result |
|---|---|---|
| Concentration | (5 × 1000) ÷ 2 | 2,500 mcg/ml |
| Volume (ml) | 250 ÷ 2,500 | 0.10 ml |
| Syringe (IU) | 0.10 × 100 | 10 IU |
Common Vial Reference Table
| Vial | BAC Water | Concentration | 100 mcg | 250 mcg | 500 mcg |
|---|---|---|---|---|---|
| 5 mg | 1 ml | 5,000 mcg/ml | 2 IU | 5 IU | 10 IU |
| 5 mg | 2 ml | 2,500 mcg/ml | 4 IU | 10 IU | 20 IU |
| 10 mg | 2 ml | 5,000 mcg/ml | 2 IU | 5 IU | 10 IU |
| 2 mg | 1 ml | 2,000 mcg/ml | 5 IU | 12.5 IU | 25 IU |
Frequently Asked Questions
Enter three values: your vial's total peptide in mg, the volume of BAC water you added in ml, and your desired dose in mcg. Hit Calculate and you'll see the exact IU to draw on a standard U-100 insulin syringe, plus an animated syringe diagram showing the fill level.
IU refers to the unit markings on a U-100 syringe where 100 IU = 1 ml. Each mark = 0.01 ml. So 10 IU = 0.10 ml, 50 IU = 0.50 ml, etc. This calculator uses U-100 scale. If using a different syringe, use the ml result directly.
Exactly 1,000 mcg in 1 mg. A 5 mg vial contains 5,000 mcg of peptide. This calculator handles the conversion automatically — just enter the vial label value in mg.
A U-100 syringe holds 100 IU (1 ml) maximum. If your result exceeds 100 IU, your solution is too dilute for the dose — use less BAC water when reconstituting to increase concentration, or use a larger syringe. Our BAC Water Calculator helps you optimize this.
No. Adding more or less BAC water changes the concentration and your draw volume, but the total peptide mass in the vial stays the same. Concentration only affects how many ml or IU you draw per dose.