Tools / 1 mg in units
How many units is 1 mg of semaglutide?
It depends on the strength printed on your vial, in mg/mL. Here's 1 mg in units and mL at each common strength, worked out on a U-100 insulin syringe.
At 1 mg/mL: 1 mg = 1 mL = the 100-unit line
Written as mg/mL, for example 2.5 mg/mL. Don't add water.
In mL, from the label. Only used to count doses.
Check whether it says mcg or mg. They differ by 1,000 times.
It's printed on the packet: 0.3, 0.5 or 1 mL.
1 mg/mL vial → 1 mg dose
Fill your syringe to
100units
The 100 line on a 1 mL syringe, which is 1 mL.
- Strength after mixing
- 1 mg/mL
- Each unit holds
- 10 mcg
- Doses in this vial
- 1
Show the math
- 1 mg × 1,000 = 1,000 mcg in the vial
- 1,000 mcg ÷ 1 mL = 1,000 mcg/mL
- 1,000 mcg ÷ 1,000 mcg/mL = 1 mL
- 1 mL × 100 units/mL = 100 units
Not what you expected? Check the numbers above, and confirm with your prescriber or pharmacist before you inject.
Checked November 8, 2026 by the PeptideTracker editorial team · This tool does the math only. It doesn't recommend a dose.
[02] Units
1 mg of semaglutide in units, by vial strength
1 mg of semaglutide is 100 units at 1 mg/mL. The same dose ranges from 20 units on a 5 mg/mL vial to 100 units on a 1 mg/mL vial. Find the mg/mL on your vial label and read across.
| Vial strength | Volume | Units | Syringe it fits |
|---|---|---|---|
| 1 mg/mL | 1 mL | 100 units | 1 mL only |
| 2 mg/mL | 0.5 mL | 50 units | 0.5 mL or 1 mL |
| 2.5 mg/mL | 0.4 mL | 40 units | 0.5 mL or 1 mL |
| 5 mg/mL | 0.2 mL | 20 units | 0.3 mL or bigger |
Example strengths for the math only, not products. * Falls between the lines on a 1 mL syringe marked every 2 units. Count the lines on yours, or use a 0.3 or 0.5 mL syringe, which usually have a line for every unit.
[03] Label
Where 1 mg sits on the semaglutide label
- Wegovy injection: step 3 of 5, weeks 9 to 12 at the earliest. Wegovy US prescribing information, section 2
- Ozempic: step 3 of 4, weeks 9 to 12 at the earliest (if more blood sugar control is needed). Ozempic US prescribing information, section 2
These are the label's earliest dates. Your prescriber decides when, or whether, to go up. The dose schedule planner turns the steps into dates from your first dose.
[04] Pens
Do pens and branded vials use units?
No. Ozempic and Wegovy pens give a set dose in mg, so there are no syringe units to count. Units only matter when your semaglutide comes in a vial with its own mg/mL. The semaglutide dosage chart has the pen doses with their label sources.
[06] Questions
Questions
How many units is 1 mg of semaglutide?
At 1 mg/mL it's 100 units (1 mL) on a U-100 insulin syringe. At other strengths it ranges from 20 to 100 units. Go by the mg/mL printed on your own vial.
How many mL is 1 mg of semaglutide?
Divide the dose by the vial strength. At 1 mg/mL, 1 mg ÷ 1 = 1 mL. On a U-100 syringe, 1 unit is 0.01 mL, so that's 100 units.
Does the syringe size change the number of units?
No. A unit on any U-100 insulin syringe is 0.01 mL. The syringe size only decides whether the dose fits: 0.3 mL holds 30 units, 0.5 mL holds 50 and 1 mL holds 100.
What if my vial only shows mg, not mg/mL?
Divide the total mg by the total mL in the vial. A vial with 10 mg in 2 mL is 5 mg/mL. If it's a powder you mix yourself, use the reconstitution calculator with the water you added.
Spotted a mistake or something out of date? Tell us. We aim to fix factual errors within two working days.
[07] Read next
Guides that go with this calculator
- Semaglutide dosage chart: mg, mL and unitsPens give you a set dose in mg. If your semaglutide comes from a vial, each label dose also has to become mL and syringe units.
- SemaglutideSemaglutide label doses: Ozempic 0.25 mg to 2 mg weekly, Wegovy 0.25 mg to 2.4 mg (max 7.2 mg). Half-life about 1 week. 0.25 mg at 2.5 mg/mL is 10 units.
- Units vs mg vs mL: what's the difference on a syringe?Units and mL measure how much liquid is in the syringe. mg and mcg measure how much medicine is in that liquid. The vial strength links the two.
- How to read an insulin syringeThe numbers on the barrel are units of liquid, not milligrams of medicine. To read one correctly, check the scale, line up the top edge of the plunger with your number and clear any air.
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