Semaglutide Calculator
Convert a dose of Semaglutide into syringe units. Enter the vial size, the bacteriostatic water added and the dose on your prescription.
Enter the vial size and the water you added.
Arithmetic only. This tool does not recommend a dose; use the one your prescriber gave you.
About Semaglutide
Semaglutide is a GLP-1 receptor agonist.
FDA-approved as a prescription medicine (Ozempic, Wegovy, Rybelsus). Compounded versions are not FDA-approved.
Ozempic and Wegovy injections are pre-filled pens that need no reconstitution and no separate syringe; Rybelsus is a tablet. This calculator applies only to semaglutide dispensed as a powder vial, or as a solution with a stated mg/mL on the label.
Semaglutide concentration chart
Concentration for common vial sizes at 1, 2, 3 and 5 mL of water, with the amount held in every 10 units of a U-100 syringe.
| Vial | 1 mL water | 2 mL water | 3 mL water | 5 mL water |
|---|---|---|---|---|
| 2 mg | 2 mg/mL · 0.2 mg (200 mcg) per 10 units | 1 mg/mL · 0.1 mg (100 mcg) per 10 units | 0.6667 mg/mL · 0.06667 mg (66.67 mcg) per 10 units | 0.4 mg/mL · 0.04 mg (40 mcg) per 10 units |
| 3 mg | 3 mg/mL · 0.3 mg (300 mcg) per 10 units | 1.5 mg/mL · 0.15 mg (150 mcg) per 10 units | 1 mg/mL · 0.1 mg (100 mcg) per 10 units | 0.6 mg/mL · 0.06 mg (60 mcg) per 10 units |
| 5 mg | 5 mg/mL · 0.5 mg (500 mcg) per 10 units | 2.5 mg/mL · 0.25 mg (250 mcg) per 10 units | 1.667 mg/mL · 0.1667 mg (166.7 mcg) per 10 units | 1 mg/mL · 0.1 mg (100 mcg) per 10 units |
| 10 mg | 10 mg/mL · 1 mg per 10 units | 5 mg/mL · 0.5 mg (500 mcg) per 10 units | 3.333 mg/mL · 0.3333 mg (333.3 mcg) per 10 units | 2 mg/mL · 0.2 mg (200 mcg) per 10 units |
Units per 1 mg of Semaglutide
How many units on a U-100 syringe hold 1 mg, for each vial size and water volume. 1 mg is a round reference amount for scaling, not a dose: multiply or divide to match the dose on your prescription, or use the calculator.
| Vial | 1 mL water | 2 mL water | 3 mL water | 5 mL water |
|---|---|---|---|---|
| 2 mg | 50 units | 100 units | 150 units · over 1 mL | 250 units · over 1 mL |
| 3 mg | 33.33 units | 66.67 units | 100 units | 166.7 units · over 1 mL |
| 5 mg | 20 units | 40 units | 60 units | 100 units |
| 10 mg | 10 units | 20 units | 30 units | 50 units |
Semaglutide dispensed as a liquid
Some pharmacies dispense Semaglutide already in solution, with the concentration printed on the label as mg/mL. No water is added, so the label figure is the concentration. The rows below are example label concentrations; use the one on your vial. The columns show how much each syringe marking holds, and the marking that holds 1 mg, a round reference amount rather than a dose.
| Label concentration | In 1 unit | In 10 units | In 50 units | 1 mg = |
|---|---|---|---|---|
| 1 mg/mL | 0.01 mg · 10 mcg | 0.1 mg · 100 mcg | 0.5 mg · 500 mcg | 100 units |
| 2 mg/mL | 0.02 mg · 20 mcg | 0.2 mg · 200 mcg | 1 mg | 50 units |
| 2.5 mg/mL | 0.025 mg · 25 mcg | 0.25 mg · 250 mcg | 1.25 mg | 40 units |
| 3 mg/mL | 0.03 mg · 30 mcg | 0.3 mg · 300 mcg | 1.5 mg | 33.33 units |
| 5 mg/mL | 0.05 mg · 50 mcg | 0.5 mg · 500 mcg | 2.5 mg | 20 units |
| 10 mg/mL | 0.1 mg · 100 mcg | 1 mg | 5 mg | 10 units |
More concentrations: mg/mL to units chart.
Questions
How do I calculate Semaglutide units on a syringe?
Divide the mg in the vial by the mL of water added to get mg/mL. Divide your prescribed dose by that figure for mL, then multiply by 100 for units on a U-100 syringe. For example, a 3 mg vial with 2 mL of water is 1.5 mg/mL, so every 10 units holds 0.15 mg (150 mcg).
How many units is 1 mg of Semaglutide?
It depends on the vial size and the water added. With a 3 mg vial, 1 mg is 33.33 units after 1 mL of water, 66.67 units after 2 mL of water, 100 units after 3 mL of water. The lookup table above covers the other vial sizes.
Is Semaglutide measured in mg or mcg?
Semaglutide vials are labelled in mg. If your prescription is written in mcg, divide by 1,000 to get mg, or switch the dose field to mcg. In a 3 mg vial mixed with 2 mL, one unit on the syringe holds 0.015 mg (15 mcg).
Does this calculator apply to Ozempic and Wegovy pens?
Ozempic and Wegovy injections are pre-filled pens that need no reconstitution and no separate syringe; Rybelsus is a tablet. This calculator applies only to semaglutide dispensed as a powder vial, or as a solution with a stated mg/mL on the label.
My Semaglutide vial is already a liquid. How do I calculate units?
Use the mg/mL printed on the label. Divide the dose in mg by that figure for mL, then multiply by 100 for units. In the calculator, enter the mg/mL as the amount in the vial and 1 mL as the water. At 2 mg/mL, every 10 units holds 0.2 mg (200 mcg).
How much bacteriostatic water do I add to Semaglutide?
Follow the amount on your pharmacy label. The volume of water does not change how much Semaglutide is in the vial; it only changes how many units a given dose takes up. Enter whatever amount was actually added.
What Semaglutide dose should I enter?
The dose written on your prescription. This page converts a dose into syringe units and does not recommend one.
Related conversions
- 2 units to mg
- 30 units to mg
- 10 units to mL
- 0.15 mL to units
- mg/mL to units chart
- mcg to mg
- All conversions
Other calculators
GLP-1 and related, and a few others.