Peptide Calculator
Enter the peptide in the vial (mg), the bacteriostatic water added (mL) and the dose (mcg) to get the units to draw on a U-100 insulin syringe. How it works
Use the Peptide Calculator
About the Peptide Calculator
Units to draw = dose ÷ (vial mg × 1000 ÷ water mL) × 100. A 5 mg vial mixed with 2 mL of bacteriostatic water holds 2.5 mg/mL (2500 mcg/mL), so a 250 mcg dose is 0.1 mL, which is 10 units on a U-100 insulin syringe. The calculator does the arithmetic only: the dose and concentration are for the prescriber or supplier to set.
Units to draw on a U-100 syringe
| Vial | Water added | Concentration | Dose | Volume | Units | Doses per vial |
|---|---|---|---|---|---|---|
| 5 mg | 2 mL | 2.5 mg/mL (2500 mcg/mL) | 250 mcg | 0.1 mL | 10 | 20 |
| 5 mg | 1 mL | 5 mg/mL (5000 mcg/mL) | 250 mcg | 0.05 mL | 5 | 20 |
| 5 mg | 2.5 mL | 2 mg/mL (2000 mcg/mL) | 250 mcg | 0.125 mL | 12.5 | 20 |
| 5 mg | 2 mL | 2.5 mg/mL (2500 mcg/mL) | 100 mcg | 0.04 mL | 4 | 50 |
| 2 mg | 1 mL | 2 mg/mL (2000 mcg/mL) | 100 mcg | 0.05 mL | 5 | 20 |
| 10 mg | 2 mL | 5 mg/mL (5000 mcg/mL) | 250 mcg | 0.05 mL | 5 | 40 |
| 10 mg | 3 mL | 3.333333 mg/mL (3333.3333 mcg/mL) | 500 mcg | 0.15 mL | 15 | 20 |
| 10 mg | 1 mL | 10 mg/mL (10000 mcg/mL) | 2000 mcg | 0.2 mL | 20 | 5 |
| 15 mg | 3 mL | 5 mg/mL (5000 mcg/mL) | 1000 mcg | 0.2 mL | 20 | 15 |
Arithmetic examples, not suggested doses. On a U-100 syringe 100 units = 1 mL.
How to use this tool
- Enter the vial quantity in mg, as printed on the vial label.
- Enter the mL of bacteriostatic water you added or will add.
- Enter the dose in mcg (1 mg = 1000 mcg) and pick the syringe size: 30, 50 or 100 units.
Frequently asked questions
- How many units is 250 mcg of a peptide?
- It depends on the concentration. In a 5 mg vial with 2 mL of water, 250 mcg is 10 units; with 1 mL of water it is 5 units; with 2.5 mL it is 12.5 units. More water spreads the same peptide over more units.
- How much bacteriostatic water do I add to a peptide vial?
- The calculator does not choose it. Enter the volume from the product instructions or your prescriber and it shows the result: 5 mg in 2 mL is 2.5 mg/mL, and 5 mg in 1 mL is 5 mg/mL. It does not say which is right.
- Are insulin syringe units the same as IU?
- No. On a U-100 insulin syringe 100 units = 1 mL, so 1 unit is 0.01 mL. These units are volume markings on the barrel, not International Units of a drug.
- How many doses are in a 10 mg vial?
- Vial mg × 1000 ÷ dose in mcg, whatever the water volume. A 10 mg vial holds 40 doses of 250 mcg and 20 doses of 500 mcg.
- What if the dose is more than my syringe holds?
- The calculator warns you. Pick a 30, 50 or 100 unit syringe; 1000 mcg from a 5 mg vial in 2 mL is 0.4 mL, and on a 30 unit syringe the warning reads "This is 40 units but a 30-unit syringe holds 30 units (0.3 mL)". A dose under 1 unit also gets a warning.
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