Wegovy Reverse Dose Calculator
Convert U-100 syringe markings to milligrams using the concentration printed on a compounded semaglutide vial. This is not a calculator for branded Wegovy pens or tablets.
- 1Enter U-100 markings
- 2Enter vial mg/mL
- 3See calculated mg
A QUICK WALKTHROUGH
How the Wegovy Reverse Dose Calculator works
The formula reverses a U-100 volume marking into milligrams using only the vial concentration you enter. It cannot verify the medicine or tell you what to inject.
Read the syringe scale
Enter the number of markings on a U-100 syringe. On that scale, 100 markings represent 1 mL.
Read the specific vial label
Enter its stated concentration in mg/mL. Compounded semaglutide concentrations vary, so a value from another vial cannot be reused.
Convert markings to mL
The calculator divides the U-100 marking number by 100. This converts a volume scale, not a drug strength.
Read the calculated mg
It multiplies mL by the entered mg/mL. Confirm all medication instructions with your prescriber or pharmacist before use.
U-100 syringe units to mg formula
Calculated mg = (U-100 syringe markings ÷ 100) × vial concentration (mg/mL). First divide the marking number by 100 to get mL. Then multiply by the concentration on the specific vial label. Syringe markings describe volume; they do not have a fixed semaglutide mg value.
Worked arithmetic example: a hypothetical vial labeled 2.5 mg/mL and 20 U-100 markings gives 0.2 mL × 2.5 mg/mL = 0.5 mg. This example is not a dose recommendation and cannot confirm the vial's actual contents.
This is not a Wegovy pen conversion
Wegovy product information describes branded pens and tablets, not a compounded multidose vial that the patient measures using a U-100 syringe. The search term “Wegovy reverse dose calculator” can be misleading: this page calculates only from a compounded semaglutide vial's stated mg/mL. Do not apply its result to a branded pen, tablet, prefilled syringe, a different medicine or a U-40 syringe.
The FDA warns that variable compounded semaglutide concentrations and confusion among mg, mL and syringe markings have caused overdoses, some requiring hospitalization. If your vial label or instructions are unclear, stop and ask the dispensing pharmacist or prescriber. This tool is educational arithmetic, not medical advice or injection guidance.
Wegovy Reverse Dose Calculator FAQs
How do I convert U-100 syringe units to mg of semaglutide?
Divide the syringe markings by 100 to get mL, then multiply by the vial concentration in mg/mL. For example, 20 markings at 2.5 mg/mL equal 0.2 mL and a calculated 0.5 mg. This is arithmetic, not a dose instruction.
How many mg is 10 units of compounded semaglutide?
There is no fixed mg amount for 10 syringe markings. On a U-100 scale, 10 markings equal 0.1 mL. Multiply 0.1 mL by the concentration printed on the specific vial label in mg/mL to calculate mg.
How many mg is 20 units of compounded semaglutide?
On a U-100 scale, 20 markings equal 0.2 mL. At a hypothetical 2.5 mg/mL, the calculated amount is 0.5 mg; at another concentration it is different. Confirm the actual vial label with your pharmacist.
Can I use this reverse calculator for a Wegovy pen or tablet?
No. The syringe-unit formula applies only when a compounded semaglutide vial has a stated concentration in mg/mL and a U-100 syringe scale is used. Branded Wegovy pens and tablets are different presentations, not compounded vials.
What if my vial label says total mg and total mL instead of mg/mL?
The arithmetic concentration is total mg divided by total mL. For example, 5 mg in 2 mL equals 2.5 mg/mL. Do not guess from a label that does not clearly give both values; ask the dispensing pharmacist to confirm the concentration and instructions.
Does 100 U-100 syringe units equal 1 mL?
Yes, on a U-100 syringe scale, 100 markings correspond to 1 mL of liquid volume. These are volume markings, not milligrams of semaglutide. This calculator does not apply to U-40 or other scales.
Can the result tell me how much to inject?
No. It does not choose or verify a prescribed dose, confirm what is actually in a vial, or determine whether a syringe is appropriate. The FDA has reported serious errors with compounded semaglutide caused by confusion among units, mL and mg. Check with your prescriber or pharmacist before administering any medication.
Sources
Sources checked . Educational conversion only, not a prescribed dose or confirmation of product contents. Wegovy is a Novo Nordisk trademark. GLP Buddy is not affiliated with Novo Nordisk.