GLP1 MathSemaglutide dosage calculator
Turn your prescribed dose in mg into units on a U-100 insulin syringe. Enter the strength printed on your vial.
How the math works
mL to draw = dose (mg) ÷ vial strength (mg/mL). Units = mL × 100. Example: 0.5 mg from a 2.5 mg/mL vial is 0.2 mL, which is 20 units.
Questions
How many units is 0.25 mg of semaglutide?
It depends on your vial strength. At 2.5 mg per mL, 0.25 mg is 0.1 mL, which is 10 units on a U-100 insulin syringe. At 5 mg per mL it is 5 units. Use the calculator with the strength printed on your vial.
What does 'units' mean on a syringe?
On a U-100 insulin syringe, 100 units equals 1 mL, so each unit is 0.01 mL. Units measure liquid volume on the syringe, not the amount of medicine. The amount of medicine depends on the vial strength.
Why do two people on the same dose draw different units?
Because compounded vials come in different strengths. The same 0.5 mg dose is 20 units from a 2.5 mg/mL vial and 10 units from a 5 mg/mL vial.
Does this work for Ozempic or Wegovy pens?
No. Brand pens are pre-measured and you dial the dose in mg. This calculator is for vials drawn with an insulin syringe, which is how most compounded semaglutide is supplied.