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Free tool
Enter your dose and the concentration of your reconstituted solution to see how many U-100 units to draw — shown filled on a to-scale insulin syringe so you can match it to the markings on your own barrel. Pick a 0.3, 0.5, or 1 mL syringe. Reference math, not medical advice.
Units = dose ÷ concentration × 100 on a U-100 syringe (1 unit = 0.01 mL). The drawing is to scale for the selected barrel. Read your own syringe's printed markings to confirm. Arithmetic only — not medical advice; verify against the product label and a clinician.
Frequently asked questions
How many units should I draw?
The number of units equals your dose divided by the solution’s concentration in mg per mL, multiplied by 100 for a U-100 syringe. For example, 0.5 mg at 2.5 mg/mL is 0.2 mL, which is 20 units. The tool fills a to-scale syringe to that mark.
What do the markings on an insulin syringe mean?
On a U-100 syringe the barrel is marked in insulin units, where 100 units equal 1 milliliter and 1 unit equals 0.01 mL. The unit marks are fine volume markings; they measure how much liquid you draw, not a dose of insulin.
Which syringe size should I use — 0.3, 0.5, or 1 mL?
Use the smallest barrel that comfortably holds your dose, because smaller barrels have finer, easier-to-read markings. A 0.3 mL syringe holds up to 30 units, a 0.5 mL holds 50, and a 1 mL holds 100. If your draw exceeds the barrel, switch to a larger one.
What if my dose is more units than the syringe holds?
Then it will not fit in one draw. You can use a larger syringe, make a more concentrated solution by adding less bacteriostatic water, or split the dose across two draws. The tool warns you when the draw exceeds the selected barrel.
Is this medical advice?
No. It is arithmetic and a visual reference only. It does not recommend a dose or a concentration and does not replace the markings printed on your syringe. Verify against the product label and with a clinician or pharmacist.