Semaglutide Weight Loss Dosage Chart in mL: How to Read Your Pen or Vial

There is no single mL dose for semaglutide, because the volume you inject depends on how concentrated the liquid is. To find your dose in milliliters, divide the prescribed milligrams by the concentration printed on the pen or vial in mg/mL. A 1 mg dose equals 0.2 mL at a 5 mg/mL concentration, but 0.75 mL in an Ozempic 1.34 mg/mL pen — the same drug in very different volumes.

Why a Semaglutide Dose Chart in mL Only Works With Concentration

Milligrams measure the drug; milliliters measure the liquid that carries it. Every semaglutide product states its concentration as a ratio, such as 0.68 mg/mL, 1.34 mg/mL, 2.68 mg/mL, or 5 mg/mL, and that number is what converts your prescription into a volume.

The rule is simple: volume (mL) = dose (mg) ÷ concentration (mg/mL). Change the concentration and the same milligram dose produces a different volume.

• Higher concentration (5 mg/mL): a smaller volume is needed for the same dose.
• Lower concentration (2.5 mg/mL): the same dose needs twice the volume.
• Different product, same drug: Ozempic, Wegovy, and compounded semaglutide each use their own concentrations.

This is why a semaglutide dosage for weight loss should always be written as a milligram amount first, with the matching volume listed second.

Semaglutide Weight Loss Dosage Chart in mL for Brand-Name Pens

Ozempic and Wegovy are both semaglutide, but they are packaged for different purposes. Ozempic is FDA-approved for type 2 diabetes and is often prescribed off-label for weight loss, while Wegovy is FDA-approved for chronic weight management.

The ozempic for weight loss dosage chart below shows how each labeled dose translates into milliliters.

Product and concentration	Labeled dose	Volume per injection
Ozempic 0.68 mg/mL	0.25 mg	0.37 mL
Ozempic 0.68 mg/mL	0.5 mg	0.74 mL
Ozempic 1.34 mg/mL	1 mg	0.75 mL
Ozempic 2.68 mg/mL	2 mg	0.75 mL
Wegovy 0.5 mg/mL	0.25 mg	0.5 mL
Wegovy 1 mg/mL	0.5 mg	0.5 mL
Wegovy 2 mg/mL	1 mg	0.5 mL
Wegovy 2.27 mg/mL	1.7 mg	0.75 mL
Wegovy 3.2 mg/mL	2.4 mg	0.75 mL

Wegovy pens are single-dose devices, so each pen contains exactly one injection at a fixed volume. Ozempic pens are multi-dose and dial to the prescribed amount, and the dose counter window shows milligrams rather than milliliters.

If you want to verify the volume on an Ozempic pen, divide the dose on the counter by the concentration on the box. The result should match the mL figures in the table above.

Compounded Semaglutide: mL Charts and Units

Compounded semaglutide usually arrives in a vial with a concentration such as 5 mg/mL or 2.5 mg/mL, and patients draw it with an insulin syringe marked in units. On a U-100 syringe, 100 units equals 1 mL, which is where a semaglutide weight loss dosage chart in units becomes helpful.

Dose	Volume at 5 mg/mL	Units at 5 mg/mL	Volume at 2.5 mg/mL	Units at 2.5 mg/mL
0.25 mg	0.05 mL	5 units	0.1 mL	10 units
0.5 mg	0.1 mL	10 units	0.2 mL	20 units
1 mg	0.2 mL	20 units	0.4 mL	40 units
1.7 mg	0.34 mL	34 units	0.68 mL	68 units
2.4 mg	0.48 mL	48 units	0.96 mL	96 units

For a semaglutide 5mg/ml dosage chart, the math is straightforward: every 10 units (0.1 mL) contains 0.5 mg. A 2.5 mg/mL vial requires double the volume for the same milligram dose, so confirm the concentration on the label with your pharmacist or prescriber before drawing anything.

Standard Weekly Titration Schedules

Semaglutide for weight loss is started low and increased roughly every four weeks to reduce nausea and other gastrointestinal side effects. The table below reflects the labeled schedules for Wegovy and Ozempic, and your clinician may go slower or hold a dose.

Weeks	Wegovy weekly dose	Ozempic weekly dose
Weeks 1–4	0.25 mg	0.25 mg
Weeks 5–8	0.5 mg	0.5 mg
Weeks 9–12	1 mg	1 mg
Weeks 13–16	1.7 mg	Up to 2 mg if needed
Week 17 and beyond	2.4 mg (maximum)	Up to 2 mg if needed

Staying at each step for the full four weeks matters. Moving up faster than prescribed raises the risk of severe nausea, vomiting, and dehydration, and it does not produce faster weight loss.

Semaglutide vs Tirzepatide: Why the mL Math Differs

Tirzepatide (Zepbound and Mounjaro) is a different medication, and the tirzepatide vs semaglutide dosage for weight loss comparison confuses many people because the two drugs are titrated on different milligram scales. Tirzepatide is typically increased from 2.5 mg up to a maximum of 15 mg weekly, while semaglutide tops out at 2.4 mg weekly for weight management.

Brand tirzepatide pens also deliver the same 0.5 mL per injection at every strength, so the volume stays constant while the dose rises. That is the opposite of most compounded semaglutide vials, where the volume grows along with the milligram dose.

If you switch between products, you need a new prescription and a new calculation. Never reuse an old mL dose from a different pen, vial, or concentration.

Safety Notes Before You Draw a Dose

• Use only the pen or syringe supplied with your prescription, and never substitute a U-40 syringe for a U-100 syringe.
• Read the concentration on the label at every dose, because packaging can change between refills.
• Compounded semaglutide is not FDA-approved, and its strength and purity are not reviewed the way brand-name products are.
• Do not split, double, or stretch doses to save money or catch up after a missed week.
• Contact a healthcare professional for severe or persistent abdominal pain, vomiting, or signs of dehydration.

This article is general information and is not a substitute for advice from a licensed healthcare professional. Your prescriber or pharmacist can confirm the exact mL or unit measurement for your specific product.

COMMON QUESTIONS

Frequently Asked Questions

How many mL is 1 mg of semaglutide?

It depends entirely on the concentration. One milligram is 0.2 mL in a 5 mg/mL compounded vial, 0.5 mL in a Wegovy 1 mg single-dose pen, and about 0.75 mL in an Ozempic 1.34 mg/mL pen. Always divide the milligram dose by the mg/mL listed on your product.

What is the starting dose of semaglutide for weight loss in mL?

The starting dose is 0.25 mg once weekly for four weeks, and the volume depends on the product. That is 0.5 mL in a Wegovy 0.25 mg pen, about 0.37 mL in the Ozempic 0.68 mg/mL pen, and 0.05 mL (5 units) in a 5 mg/mL compounded vial.

Is compounded semaglutide dosed the same as Ozempic or Wegovy?

No. Brand-name pens are fixed-dose devices with their own concentrations, while compounded vials come in strengths like 2.5 mg/mL or 5 mg/mL that you draw yourself. Compounded semaglutide is not FDA-approved, so the milligram dose and the matching volume should be confirmed by your prescriber or pharmacist.