Semaglutide dosage calculator

Semaglutide dose in units

Semaglutide doses are written in mg, and a vial is drawn with a syringe marked in units. The conversion only works with your vial’s strength, so enter the mg/mL from the label and the dose to get the units, or look up what a number of units holds.

mg → units
Units → mg
Charts for 0.25–2.4 mg
Label schedule, sourced

Start calculating See the chart

Semaglutide units calculator

Draw to

—

units
on U-100

Enter the vial, the mix and the dose to see where to draw.

—mg/mL

Concentration

—mL

Volume to draw

—doses

Doses per vial

—days

Vial lasts (set frequency)

U-100 · 1 mL (100 units)

Drawn to scale

Worked example

10 units, step by step

The example numbers show how the math works. They are not a dose recommendation.

1The vial label says 2.5 mg/mL.
2A 0.25 mg dose: 0.25 ÷ 2.5 = 0.1 mL.
30.1 mL × 100 = 10 units on a U-100 syringe.

Semaglutide dosing chart in units

Units on a U-100 syringe for the label dose steps at example vial strengths, and the reverse: how many mg a number of units holds. Every cell comes from the calculator’s formula.

Semaglutide: units for each dose step

Dose / Concentration	1 mg/mL	2 mg/mL	2.5 mg/mL	3 mg/mL	5 mg/mL
0.25 mg	25 u	12.5 u	10 u	8.3 u	5 u
0.5 mg	50 u	25 u	20 u	16.7 u	10 u
1 mg	100 u	50 u	40 u	33.3 u	20 u
1.7 mg	> 1 mL	85 u	68 u	56.7 u	34 u
2 mg	> 1 mL	100 u	80 u	66.7 u	40 u
2.4 mg	> 1 mL	> 1 mL	96 u	80 u	48 u

Units on a U-100 insulin syringe (100 units = 1 mL). “> 1 mL” means the dose does not fit a 1 mL syringe at that strength. Computed by the same formula as the calculator.

How many mg is X units? It depends on the concentration

Units / vial	1 mg/mL	2 mg/mL	2.5 mg/mL	5 mg/mL
5 units	0.05 mg	0.1 mg	0.125 mg	0.25 mg
10 units	0.1 mg	0.2 mg	0.25 mg	0.5 mg
20 units	0.2 mg	0.4 mg	0.5 mg	1 mg
25 units	0.25 mg	0.5 mg	0.625 mg	1.25 mg
40 units	0.4 mg	0.8 mg	1 mg	2 mg
50 units	0.5 mg	1 mg	1.25 mg	2.5 mg

mg = units ÷ 100 × concentration (U-100 syringe). The same number of units holds a different dose in every vial strength.

Units → mg

Already know the units? Enter them with your vial strength to see the dose in mg (U-100 syringe).

Units on the syringe

units

Vial concentration

mg/mL

—

Wegovy (injection)

Label schedule

Weeks 1–40.25 mg once weekly
Weeks 5–80.5 mg once weekly
Weeks 9–121 mg once weekly
Weeks 13–161.7 mg once weekly
Week 17 on2.4 mg once weekly (or 1.7 mg)Adult weight reduction maintenance. If a step is not tolerated the label says to consider delaying escalation by 4 weeks.
Maximum7.2 mg once weekly, only after 2.4 mg is tolerated for at least 4 weeks

Single-dose pens: 0.25, 0.5 and 1 mg in 0.5 mL; 1.7 and 2.4 mg in 0.75 mL.
FlexTouch pen: 9.6 mg in 3 mL (3.2 mg/mL), 4 doses of 2.4 mg.

Source: Wegovy US Prescribing Information, Table 1 (Novo Nordisk; DailyMed SPL effective 2026-06-18; DailyMed, checked 2026-09-30). Label schedule only: follow your prescriber.

Ozempic

Label schedule

Weeks 1–40.25 mg once weeklyStarting dose.
Week 5 on0.5 mg once weekly
If needed1 mg, then 2 mgEach after at least 4 weeks on the current dose.
Maximum2 mg once weekly

Pens: 2 mg/3 mL (0.68 mg/mL), 4 mg/3 mL (1.34 mg/mL), 8 mg/3 mL (2.68 mg/mL).

Source: Ozempic US Prescribing Information, section 2 (Novo Nordisk; DailyMed SPL effective 2026-06-01; DailyMed, checked 2026-09-30). Label schedule only: follow your prescriber.

Converting units and mg needs a concentration

There is no single answer to how many mg a unit is. A unit is 0.01 mL on a U-100 syringe, and how much semaglutide sits in that 0.01 mL depends on the vial. Double the strength and the same units hold double the dose. Always convert with the mg/mL on your own label.

Pens and vials

Branded semaglutide pens deliver a fixed or dialled dose in mg, so they do not need a units conversion. The conversion matters when semaglutide comes in a vial and is drawn up with an insulin syringe. The label schedule is included so you can check the mg figure you were given, not to suggest one.

Sources (checked 30 September 2026)

About this page

Who made it, and how

Made by FangFang, an independent app studio run by Fang Fang in Auckland, New Zealand.

We draft with AI assistance. Facts are checked against the primary sources linked on the page (US prescribing information and product labels on DailyMed, CDC and NLM pages), each with the date it was checked. Every number comes from the calculator’s own formula, which is covered by automated tests, including the worked example above. A person reviews the page before it is published. No doctor or pharmacist has reviewed it, which is why it sticks to arithmetic and quoted labels.

Last reviewed 30 September 2026

FAQ

Questions

How many mg is 40 units of semaglutide?

It depends on the vial strength. On a U-100 syringe 40 units is 0.4 mL: 1 mg at 2.5 mg/mL, 2 mg at 5 mg/mL and 0.4 mg at 1 mg/mL. Use the units → mg lookup with your own strength.

How many units is 0.25 mg of semaglutide?

At 2.5 mg/mL, 0.25 mg is 10 units on a U-100 syringe; at 5 mg/mL it is 5 units; at 1 mg/mL it is 25 units.

How many units is 1.7 mg or 2.4 mg?

At 5 mg/mL, 1.7 mg is 34 units and 2.4 mg is 48 units. At 2.5 mg/mL they are 68 and 96 units, so 2.4 mg would not fit a 0.5 mL syringe.

What is the semaglutide dose schedule on the label?

For Wegovy injections the US label steps up every 4 weeks: 0.25 mg, 0.5 mg, 1 mg, 1.7 mg, then 2.4 mg (or 1.7 mg) from week 17. Ozempic starts at 0.25 mg for 4 weeks, then 0.5 mg, with increases to 1 mg and 2 mg if needed. Follow your prescriber.

Does the calculator tell me what dose to take?

No. It only converts the dose you already have into mL and syringe units. It has no default doses and does not check whether a dose is right for you. Your prescriber or pharmacist decides the dose and how to prepare it.

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