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Free tool
This free mg-to-units converter turns a peptide dose in milligrams into the matching units on a U-100 insulin syringe — and back. Enter your reconstituted concentration (mg/mL), your dose (mg) and the syringe scale to get the exact units to draw. Arithmetic only — not medical advice.
Units = (dose ÷ concentration) × scale. On a U-100 syringe, 100 units = 1 mL. Arithmetic only — not medical advice.
| Vial | 1 mL water | 2 mL water | 3 mL water | 5 mL water |
|---|---|---|---|---|
| 2 mg | 2 | 1 | 0.67 | 0.4 |
| 5 mg | 5 | 2.5 | 1.67 | 1 |
| 10 mg | 10 | 5 | 3.33 | 2 |
| 15 mg | 15 | 7.5 | 5 | 3 |
| 20 mg | 20 | 10 | 6.67 | 4 |
| 30 mg | 30 | 15 | 10 | 6 |
Concentration = vial strength ÷ bacteriostatic water added. A 10 mg vial with 2 mL of water gives 5 mg/mL.
| Dose | 1 mg/mL | 2 mg/mL | 2.5 mg/mL | 5 mg/mL | 10 mg/mL |
|---|---|---|---|---|---|
| 0.1 mg (100 mcg) | 10 | 5 | 4 | 2 | 1 |
| 0.25 mg (250 mcg) | 25 | 12.5 | 10 | 5 | 2.5 |
| 0.5 mg (500 mcg) | 50 | 25 | 20 | 10 | 5 |
| 1 mg (1,000 mcg) | 100 | 50 | 40 | 20 | 10 |
| 2 mg (2,000 mcg) | 200 | 100 | 80 | 40 | 20 |
| 2.5 mg (2,500 mcg) | 250 | 125 | 100 | 50 | 25 |
| 5 mg (5,000 mcg) | 500 | 250 | 200 | 100 | 50 |
On a U-100 syringe, 100 units = 1 mL, so units = (dose ÷ concentration) × 100. Values are syringe units, not mg. Amber values exceed 100 units — more than one standard 1 mL U-100 syringe holds, so that combination needs a more concentrated solution. IU is not shown on purpose: an international unit is defined per-substance by biological activity, so there is no universal mg-to-IU factor — see mcg vs mg vs IU.
Frequently asked questions
What does “units” mean on an insulin syringe?
On a U-100 insulin syringe, 100 units equal 1 milliliter, so the unit marks are really just fine volume markings. The converter turns a dose in milligrams into the matching unit mark to fill the syringe to — it is not measuring a dose of insulin.
How do I convert milligrams to syringe units?
Divide your dose in milligrams by the solution’s concentration in mg/mL to get the volume in milliliters, then multiply by 100 for a U-100 syringe. The converter does this in both directions — enter a dose to get units, or units to get the delivered dose.
What if my syringe isn’t U-100?
The converter assumes a U-100 scale (100 units per milliliter), which is the most common insulin syringe. If your syringe uses a different scale, the unit marks will not match — check the scale printed on the barrel and enter the matching value.
Where does the concentration come from?
You provide it. The concentration in mg/mL depends on how the vial was reconstituted — use the bacteriostatic water calculator or the full peptide calculator to work it out, then enter it here.
Is this calculator medical advice?
No — it is arithmetic and reference only. It does not recommend a dose and does not assess whether any dose is appropriate. Verify with a clinician, the product label, or a pharmacist.