Semaglutide Dosage Calculator
Use this semaglutide dose-to-units calculator to convert the amount on your prescription from mg to liquid mL and U-40 or U-100 syringe markings using the labeled mg per 1 mL or per 0.5 mL on a compounded semaglutide vial. No vial concentration or dose is assumed.
- 1Read vial mg/mL
- 2Enter prescribed mg
- 3Check the volume
A QUICK WALKTHROUGH
How the Semaglutide Dosage Calculator works
The tool converts an already-prescribed mg amount into liquid volume using the exact concentration on one vial. It cannot verify the vial or decide a treatment dose.
Find the concentration
Read both the milligrams and the corresponding volume from your own compounded semaglutide liquid-vial label. Different vials can have different concentrations.
Enter your written prescription
Use the prescribed milligram amount, not a dose suggested by another website or a different vial.
Choose the syringe type
Match U-40 or U-100 on the syringe your pharmacy specified. Optionally enter barrel capacity to check whether the result fits.
Read and verify the result
The calculator displays mL and markings for the selected scale. Check your label and instructions with your dispensing pharmacist before use.
Semaglutide mg to mL and syringe units formula
Liquid volume (mL) = prescribed amount (mg) ÷ vial concentration (mg/mL). First divide the labeled mg by the paired mL to get mg/mL. For example, 2.5 mg per 0.5 mL is 5 mg/mL, not 2.5 mg/mL. Syringe units = mL × the selected scale: multiply by 100 for U-100 or 40 for U-40. The same 0.1 mL reads 10 on U-100 and 4 on U-40. This comparison is not an instruction to switch syringes. These markings measure volume, not a fixed semaglutide strength. You cannot convert mg to markings without the actual vial concentration.
Why concentration changes the unit count
Consider a hypothetical prescribed amount of 0.5 mg. If a liquid vial is labeled 2.5 mg/mL, that is 0.2 mL or 20 U-100 markings. If another vial is labeled 5 mg/mL, the same 0.5 mg is 0.1 mL or 10 markings. The arithmetic changes because the concentration changes. These examples are not injection instructions or dose recommendations.
The FDA reports that mg, mL and syringe-unit mix-ups with compounded semaglutide have caused overdoses, some requiring hospital care. If your label or prescription is unclear, ask your dispensing pharmacist before using a calculated number.
Not for Ozempic or Wegovy pens or tablets
This calculator only uses a concentration printed on a compounded liquid vial. Ozempic pen instructions and Wegovy product guidance are separate from vial-and-syringe calculations. Do not apply this output to a branded pen, oral tablet, an unknown liquid or a syringe scale other than U-40 or U-100.
The result cannot confirm product identity, quality, sterility or actual concentration. It also cannot tell you whether compounded semaglutide is appropriate for you or how to prepare it. Follow your prescriber's and pharmacist's instructions.
Semaglutide Dosage Calculator FAQs
What does a semaglutide dosage calculator convert?
This tool converts a prescribed milligram amount and the exact concentration on a compounded liquid vial into milliliters. It also shows the equivalent volume markings on the selected U-40 or U-100 syringe. It does not select or confirm a dose.
How many units is 0.25 mg of semaglutide?
There is no fixed unit count without the vial concentration and syringe scale. For a hypothetical 2.5 mg/mL vial, 0.25 mg is 0.1 mL or 10 U-100 volume markings. A different mg/mL produces a different result. Check your own label and instructions with your pharmacist.
How many units is 0.5 mg of semaglutide?
The number depends on mg/mL and the syringe scale. At a hypothetical 2.5 mg/mL, 0.5 mg is 0.2 mL or 20 U-100 markings. This arithmetic example is not a recommended dose or a direction to inject.
How many units is 1 mg of semaglutide?
It depends on the exact vial concentration and syringe scale. For a hypothetical 5 mg/mL vial, 1 mg is 0.2 mL or 20 U-100 markings. Never reuse that number for a different vial concentration.
How much semaglutide is 20 units?
Twenty markings on a U-100 syringe equal 0.2 mL, but the milligrams depend on the vial concentration. Multiply 0.2 mL by the labeled mg/mL to calculate mg. For example, 2.5 mg/mL gives 0.5 mg mathematically.
Are syringe units the same as milligrams?
No. U-100 markings describe liquid volume, with 100 markings equal to 1 mL. Milligrams describe medication mass. You need the concentration in mg/mL to convert between them.
Can this calculate doses for Ozempic or Wegovy pens or tablets?
No. This calculator covers labeled liquid-vial concentration arithmetic only. Ozempic and Wegovy pens and semaglutide tablets have separate product-specific directions. Do not transfer a vial marking result to those products.
Can I use total milligrams printed on a vial instead of mg/mL?
No. The calculator needs concentration in mg per mL. Total mg does not describe how much medication is in each milliliter unless the total volume is also known. Ask your dispensing pharmacist to confirm the concentration if the label is unclear.
Does changing syringe size change the calculated semaglutide amount?
Changing capacity within one scale does not change the units or mL. Changing between U-40 and U-100 changes the units, but not the mL. The calculator withholds results that exceed the selected capacity.
Does this calculator tell me how much BAC water to add?
No. It provides no mixing, reconstitution or preparation instructions. Enter only the mg/mL stated on a prescribed liquid vial. Confirm any product preparation questions directly with a pharmacist or prescriber.
Sources
Sources checked . Educational arithmetic only, not medical advice or an injection instruction. GLP Buddy is not affiliated with Novo Nordisk.