Semaglutide Units Chart: How Many Units for 0.25mg, 0.5mg, 1mg and 2mg

Semaglutide is dosed in milligrams (mg), but an insulin syringe is marked in units. To draw the right amount you need to convert your target dose into units, and that number depends entirely on how concentrated your vial is after mixing. This page maps the four most common doses, 0.25mg, 0.5mg, 1mg and 2mg, to syringe units across typical concentrations.

Numbers below are reference math for research and educational use only. They are not dosing instructions. Confirm any protocol with a licensed clinician, and use the semaglutide calculator to check your own vial.

The one formula behind every number

On a U-100 insulin syringe, 100 units equals 1mL. So units depend on the concentration, which is total peptide divided by the water you add:

• Concentration (mg/mL) = peptide mg / bacteriostatic water mL
• Units = (dose mg / concentration mg/mL) x 100

Worked example: a 5mg vial reconstituted with 1mL of water is 5mg/mL. A 0.25mg dose is (0.25 / 5) x 100 = 5 units. Same vial, same dose, but with 2mL of water gives 2.5mg/mL, so the dose becomes 10 units. The mg never changed. Only the volume you pull did.

Units chart: 5mg vial

A 5mg vial is the most common size. Here is how the four standard doses map at two popular fill volumes.

5mg vial + 1mL water (5mg/mL)

• 0.25mg = 5 units
• 0.5mg = 10 units
• 1mg = 20 units
• 2mg = 40 units

5mg vial + 2mL water (2.5mg/mL)

• 0.25mg = 10 units
• 0.5mg = 20 units
• 1mg = 40 units
• 2mg = 80 units

Units chart: 10mg vial

Larger vials shift the math. At 10mg the same doses read differently again, which is exactly why a fixed chart from someone else's vial can mislead you.

10mg vial + 1mL water (10mg/mL)

• 0.25mg = 2.5 units
• 0.5mg = 5 units
• 1mg = 10 units
• 2mg = 20 units

10mg vial + 2mL water (5mg/mL)

• 0.25mg = 5 units
• 0.5mg = 10 units
• 1mg = 20 units
• 2mg = 40 units

Notice the 10mg vial at 2mL gives the identical chart to the 5mg vial at 1mL. Both are 5mg/mL. Concentration is the only thing that decides units, so two different vials can share the same numbers.

Why 0.25mg is the trickiest to draw

The lowest reference dose is the one most likely to land on a tiny, hard-to-read line. At 10mg/mL, 0.25mg is just 2.5 units, which sits between marks on most U-100 syringes. Two ways researchers handle this:

• Use a 0.3mL (30-unit) syringe, where each line is finer and small volumes are easier to read.
• Reconstitute with more water so the same 0.25mg dose spreads across more units (5mg/mL puts it at 5 units, a cleaner draw).

If the unit markings are unfamiliar, see how to read an insulin syringe for peptides. To pick a fill volume on purpose, the reconstitution calculator shows units at any water amount before you mix.

How to use these charts safely

1. Confirm vial strength. Read the actual mg on your vial, not a label you assume.
2. Decide your water volume. This sets concentration and locks in your units per dose.
3. Match the right chart. Use the section for your exact mg and mL, not a different vial.
4. Verify with the tool. Enter your numbers in the semaglutide calculator and confirm the units match by hand.
5. Recheck after any change. New vial size or new water volume means a brand-new chart.

For background on reading and mixing, see semaglutide units per dose and the broader peptide dosage explained guide. All figures here are general reference information. Any decision about whether or how to use a research compound belongs with a qualified clinician. See our disclaimer.