Enter your vial size, the water you add and your dose. See the concentration, how much to draw and where to fill a U-100 insulin syringe.
Each one is preset with that peptide's usual vial sizes and has its own units chart.
Reconstitution is three divisions. The calculator does them for you, and you can check each one by hand:
5 mg ÷ 2 mL = 2.5 mg/mL (2,500 mcg/mL).250 mcg ÷ 2,500 mcg/mL = 0.1 mL.0.1 mL × 100 = 10 units.A shortcut: mcg per unit = (vial mg × 1000) ÷ (water mL × 100). With 5 mg and 2 mL that's 25 mcg per unit, so 250 mcg is 10 units.
How many mcg one unit on a U-100 syringe holds, for common vial sizes and water amounts.
| Vial | 1 mL water | 2 mL water | 3 mL water |
|---|---|---|---|
| 2 mg | 20 mcg/unit | 10 mcg/unit | 6.67 mcg/unit |
| 5 mg | 50 mcg/unit | 25 mcg/unit | 16.67 mcg/unit |
| 10 mg | 100 mcg/unit | 50 mcg/unit | 33.33 mcg/unit |
| 15 mg | 150 mcg/unit | 75 mcg/unit | 50 mcg/unit |
| 20 mg | 200 mcg/unit | 100 mcg/unit | 66.67 mcg/unit |
The water doesn't change how much peptide is in a dose. It only changes how much liquid each dose takes up. Less water means a stronger solution and a smaller draw. More water means a weaker solution and a bigger draw that's easier to measure. Many people pick a water amount so the dose lands on a round number, like 10 or 20 units. The Units → water to add tab works that out for you.
Keep the draw within your syringe's markings. Draws under about 2 units are hard to measure accurately.
Work out how many mcg are in each unit: (vial mg × 1000) ÷ (water mL × 100). Then divide your dose in mcg by that number. Example: a 5 mg vial with 2 mL of water has 25 mcg per unit, so 250 mcg is 10 units.
A U-100 insulin syringe is marked so that 100 units equals 1 mL. One unit is 0.01 mL. They come in 0.3 mL (30 units), 0.5 mL (50 units) and 1 mL (100 units) sizes.
1 mg = 1,000 mcg. Vials are usually labelled in mg and doses often in mcg. The calculator converts for you.
No. More water lowers the concentration, so you draw more volume for the same dose. The amount of peptide per dose stays the same.
Divide the peptide in the vial by the dose, in the same units. A 5 mg (5,000 mcg) vial at 250 mcg per dose holds 20 doses.
No. This calculator only does the arithmetic for amounts you enter. It does not recommend any dose. Talk to a licensed clinician about whether and how to use any substance.