How many units is 0.25 mg of semaglutide?

It depends entirely on your vial's concentration, which is why there is no single answer. On a 5 mg/mL vial, 0.25 mg is 0.05 mL — 5 units on a U-100 insulin syringe. On a 2.5 mg/mL vial the same dose is 10 units, and on a 1 mg/mL vial it is 25 units. Check the concentration on your vial before you read any chart.

How many mg is 20 units of semaglutide?

On a U-100 syringe, 20 units is always 0.2 mL — but how much semaglutide that contains depends on the vial. At 5 mg/mL it is 1 mg. At 2.5 mg/mL it is 0.5 mg. At 10 mg/mL it is 2 mg. The units number alone never identifies a dose.

Why does my chart not match someone else's?

Because a compounded vial's concentration is set when it is reconstituted — total milligrams divided by the millilitres of bacteriostatic water added — and pharmacies do not all use the same pairing. A 5 mg vial made up with 1 mL is 5 mg/mL; the same 5 mg vial with 2 mL is 2.5 mg/mL, and every unit figure on it doubles. Two people on identical doses can be drawing to completely different marks.

Do Wegovy and Ozempic pens have units?

No. Wegovy and Ozempic are pre-filled, fixed-dose pens: you select a dose in milligrams and the pen delivers it. There is nothing to convert, and an insulin syringe is not used. Units only come into it when a compounded multi-dose vial is drawn with a U-100 syringe.

Interactive tool · Unit converter

How many units is my semaglutide dose?

Compounded semaglutide ships as a multi-dose vial measured in milligrams, but an insulin syringe is marked in units. Convert your own vial below, or read the answer straight off the dosage chart — every standard dose at every common concentration, already worked out. It is a math converter, not a dose recommendation.

Read before you use this

This is an educational arithmetic converter, not medical advice and not a dosing recommendation. It does not tell you what dose to take — it only converts numbers you enter between milligrams and U-100 syringe units. It applies only to compounded multi-dose vials drawn with an insulin syringe under a prescriber's direction; brand-name Wegovy and Ozempic are fixed-dose pens — you dial the dose and there are no "units" to compute. Compounded products vary in strength and quality, and a math slip in self-injected medication can be dangerous. Always confirm your vial strength, the exact water volume, your prescribed dose, and your syringe type with the prescriber and pharmacy who supplied them before drawing or injecting anything.

Your compounded vial

Total semaglutide in the vialmgThe total milligrams on the vial label — not your dose. Common compounded vials are 5, 10, or 12.5 mg.Bacteriostatic water addedmLThe volume of BAC water used to reconstitute it — follow your pharmacy's exact instruction.

Reconstituted concentration: 5 mg/mL (5 mg ÷ 1 mL)

Desired dosemgThe dose in milligrams you want to draw, exactly as your prescriber specified.

Draw to this mark

5units

on a U-100 insulin syringe

0.05 mL

volume drawn

Math only — this is not a dose recommendation. Compounded vials vary; confirm your vial strength, water volume, and the exact dose your prescriber set before drawing anything.

How it is calculated. Reconstituting a vial fixes its concentration = total mg ÷ mL of bacteriostatic water. A U-100 insulin syringe reads 100 units per 1 mL, so units = (dose mg ÷ concentration) × 100, and reversing it, dose mg = (units ÷ 100) × concentration. Worked example: 5 mg vial + 1 mL water = 5 mg/mL; a 0.25 mg dose = 0.05 mL = 5 units.

Semaglutide dosage chart in units

One number decides everything on this page, and it is not your dose — it is your vial's concentration, the milligrams of semaglutide in each millilitre of liquid after it was reconstituted. A U-100 insulin syringe is marked in units, where 100 units is 1 mL, and it has no idea what is dissolved in that millilitre. So "20 units of semaglutide" is not a dose until you say what the vial is. Find your concentration in the column headings below and read across.

Dose in mg → units on the syringe

Semaglutide dose in milligrams converted to units on a U-100 insulin syringe, for each common compounded vial concentration. Cells marked with a double dagger exceed the 100 units a standard 1 mL insulin syringe holds.
Dose	1 mg/mL	2 mg/mL	2.5 mg/mL	5 mg/mL	10 mg/mL
0.125 mg	12.5 units0.125 mL	6.3 units0.0625 mL	5 units0.05 mL	2.5 units0.025 mL	1.3 units0.0125 mL
0.25 mg	25 units0.25 mL	12.5 units0.125 mL	10 units0.1 mL	5 units0.05 mL	2.5 units0.025 mL
0.5 mg	50 units0.5 mL	25 units0.25 mL	20 units0.2 mL	10 units0.1 mL	5 units0.05 mL
0.75 mg	75 units0.75 mL	37.5 units0.375 mL	30 units0.3 mL	15 units0.15 mL	7.5 units0.075 mL
1 mg	100 units1 mL	50 units0.5 mL	40 units0.4 mL	20 units0.2 mL	10 units0.1 mL
1.25 mg	125 units — more than one 100-unit syringe holds1.25 mL	62.5 units0.625 mL	50 units0.5 mL	25 units0.25 mL	12.5 units0.125 mL
1.7 mg	170 units — more than one 100-unit syringe holds1.7 mL	85 units0.85 mL	68 units0.68 mL	34 units0.34 mL	17 units0.17 mL
2 mg	200 units — more than one 100-unit syringe holds2 mL	100 units1 mL	80 units0.8 mL	40 units0.4 mL	20 units0.2 mL
2.4 mg	240 units — more than one 100-unit syringe holds2.4 mL	120 units — more than one 100-unit syringe holds1.2 mL	96 units0.96 mL	48 units0.48 mL	24 units0.24 mL

This draw is larger than a standard 1 mL insulin syringe holds — 100 units is the whole barrel. The arithmetic is correct; the syringe is the constraint. In practice it means the concentration and the dose are mismatched, which is a question for the pharmacy rather than something to solve by splitting the dose across two injections.

Units on the syringe → dose in mg

Units on a U-100 insulin syringe converted to a semaglutide dose in milligrams, for each common compounded vial concentration. Cells marked with a dagger deliver more than the 2.4 mg recommended maintenance dose.
Syringe mark	1 mg/mL	2 mg/mL	2.5 mg/mL	5 mg/mL	10 mg/mL
2 units	0.02 mg	0.04 mg	0.05 mg	0.1 mg	0.2 mg
4 units	0.04 mg	0.08 mg	0.1 mg	0.2 mg	0.4 mg
5 units	0.05 mg	0.1 mg	0.125 mg	0.25 mg	0.5 mg
8 units	0.08 mg	0.16 mg	0.2 mg	0.4 mg	0.8 mg
10 units	0.1 mg	0.2 mg	0.25 mg	0.5 mg	1 mg
12 units	0.12 mg	0.24 mg	0.3 mg	0.6 mg	1.2 mg
15 units	0.15 mg	0.3 mg	0.375 mg	0.75 mg	1.5 mg
20 units	0.2 mg	0.4 mg	0.5 mg	1 mg	2 mg
25 units	0.25 mg	0.5 mg	0.625 mg	1.25 mg	2.5 mg — above the 2.4 mg recommended maintenance dose
30 units	0.3 mg	0.6 mg	0.75 mg	1.5 mg	3 mg — above the 2.4 mg recommended maintenance dose
40 units	0.4 mg	0.8 mg	1 mg	2 mg	4 mg — above the 2.4 mg recommended maintenance dose
50 units	0.5 mg	1 mg	1.25 mg	2.5 mg — above the 2.4 mg recommended maintenance dose	5 mg — above the 2.4 mg recommended maintenance dose
60 units	0.6 mg	1.2 mg	1.5 mg	3 mg — above the 2.4 mg recommended maintenance dose	6 mg — above the 2.4 mg recommended maintenance dose
70 units	0.7 mg	1.4 mg	1.75 mg	3.5 mg — above the 2.4 mg recommended maintenance dose	7 mg — above the 2.4 mg recommended maintenance dose
80 units	0.8 mg	1.6 mg	2 mg	4 mg — above the 2.4 mg recommended maintenance dose	8 mg — above the 2.4 mg recommended maintenance dose
100 units	1 mg	2 mg	2.5 mg — above the 2.4 mg recommended maintenance dose	5 mg — above the 2.4 mg recommended maintenance dose	10 mg — above the 2.4 mg recommended maintenance dose

This mark delivers more than 2.4 mg, the recommended once-weekly maintenance dose in Wegovy's FDA label. Seeing a number in this table does not mean it is a dose anyone should draw — it means that is what the syringe would deliver at that concentration. If your prescribed dose lands on a marked cell, check the vial strength and the water volume before you check anything else: a mis-reconstituted vial is the usual explanation.

Which concentration do I have?

The vial label states a total in milligrams, not a concentration — the concentration only exists once water has been added. If your pharmacy shipped the vial already mixed, the concentration is on the label or the paperwork. If it shipped a powder and an instruction, the concentration is whatever that instruction produces, and our reconstitution calculator works it out from the vial size and the water volume. These are the pairings that produce each column above:

1 mg/mL: 2 mg vial + 2 mL water · 5 mg vial + 5 mL
2 mg/mL: 4 mg vial + 2 mL water · 10 mg vial + 5 mL
2.5 mg/mL: 2.5 mg vial + 1 mL water · 5 mg vial + 2 mL
5 mg/mL: 5 mg vial + 1 mL water · 10 mg vial + 2 mL
10 mg/mL: 10 mg vial + 1 mL water · 5 mg vial + 0.5 mL

Semaglutide 5 mg/mL dosage chart

The most common compounded strength — a 5 mg vial reconstituted with 1 mL of bacteriostatic water, or a 10 mg vial with 2 mL. It is convenient because the early ladder lands on round numbers: 0.25 mg is 5 units, 0.5 mg is 10, and 1 mg is 20.

Semaglutide dosage chart for a 5 mg/mL vial: each dose in milligrams with its volume in millilitres and its mark on a U-100 insulin syringe.
Dose	Volume	U-100 syringe mark
0.125 mg	0.025 mL	2.5 units
0.25 mg	0.05 mL	5 units
0.5 mg	0.1 mL	10 units
0.75 mg	0.15 mL	15 units
1 mg	0.2 mL	20 units
1.25 mg	0.25 mL	25 units
1.7 mg	0.34 mL	34 units
2 mg	0.4 mL	40 units
2.4 mg	0.48 mL	48 units

Semaglutide 2.5 mg/mL dosage chart

Half the strength, so every mark doubles: 0.25 mg is 10 units here rather than 5. The trade-off is precision at the bottom of the ladder — a dilute vial spreads a small dose across more of the syringe, where it is easier to read accurately, at the cost of drawing a larger volume once you reach maintenance.

Semaglutide dosage chart for a 2.5 mg/mL vial: each dose in milligrams with its volume in millilitres and its mark on a U-100 insulin syringe.
Dose	Volume	U-100 syringe mark
0.125 mg	0.05 mL	5 units
0.25 mg	0.1 mL	10 units
0.5 mg	0.2 mL	20 units
0.75 mg	0.3 mL	30 units
1 mg	0.4 mL	40 units
1.25 mg	0.5 mL	50 units
1.7 mg	0.68 mL	68 units
2 mg	0.8 mL	80 units
2.4 mg	0.96 mL	96 units

Semaglutide 10 mg/mL dosage chart

The most concentrated of the common setups, and the least forgiving. At 10 mg/mL a starting dose of 0.25 mg is 2.5 units — a mark between two lines on most U-100 syringes — and a one-unit misread is a 0.1 mg error. This is the concentration where the arithmetic is worth double-checking rather than eyeballing.

Semaglutide dosage chart for a 10 mg/mL vial: each dose in milligrams with its volume in millilitres and its mark on a U-100 insulin syringe.
Dose	Volume	U-100 syringe mark
0.125 mg	0.0125 mL	1.3 units
0.25 mg	0.025 mL	2.5 units
0.5 mg	0.05 mL	5 units
0.75 mg	0.075 mL	7.5 units
1 mg	0.1 mL	10 units
1.25 mg	0.125 mL	12.5 units
1.7 mg	0.17 mL	17 units
2 mg	0.2 mL	20 units
2.4 mg	0.24 mL	24 units

Is 50 units of semaglutide a lot?

This is the most-asked version of the question, and the honest answer is that it is unanswerable as asked — but the range is worth seeing. Fifty units is 0.5 mL of liquid. On a 1 mg/mL vial that is 0.5 mg, an ordinary second rung of the titration ladder. On 5 mg/mL it is 2.5 mg, just past the 2.4 mg once-weekly maintenance dose Wegovy's label recommends. On 10 mg/mL it is 5 mg — more than double that dose.

The same 50 units is therefore either unremarkable or a serious overdose depending on a number printed on a vial. That asymmetry is the reason to read the concentration first and the syringe second, every single time — and the reason a chart you found on a forum, where nobody stated the concentration, is worth nothing. If your figures do not reconcile, the conversation to have is with the pharmacy that filled the vial, not with a calculator.

Where to actually get it · affiliate partners

Where compounded vials come from

Unit math only helps if you already have a vial. These are the telehealth programs we partner with, each with a clinician reviewing an online intake first.

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See how the whole field compares

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Common questions

How many units is 0.25 mg of semaglutide?: It depends entirely on your vial's concentration, which is why there is no single answer. On a 5 mg/mL vial, 0.25 mg is 0.05 mL — 5 units on a U-100 insulin syringe. On a 2.5 mg/mL vial the same dose is 10 units, and on a 1 mg/mL vial it is 25 units. Check the concentration on your vial before you read any chart.
How many mg is 20 units of semaglutide?: On a U-100 syringe, 20 units is always 0.2 mL — but how much semaglutide that contains depends on the vial. At 5 mg/mL it is 1 mg. At 2.5 mg/mL it is 0.5 mg. At 10 mg/mL it is 2 mg. The units number alone never identifies a dose.
Is 50 units of semaglutide a lot?: It can be. 50 units is 0.5 mL. On a 5 mg/mL vial that delivers 2.5 mg, slightly more than the 2.4 mg recommended once-weekly maintenance dose in Wegovy's FDA label; on a 10 mg/mL vial it is 5 mg, more than double it. On a 1 mg/mL vial the same 50 units is 0.5 mg, an ordinary early titration dose. If a prescribed dose converts to a number that surprises you, confirm the vial strength and the water volume with the pharmacy before drawing anything.
Why does my chart not match someone else's?: Because a compounded vial's concentration is set when it is reconstituted — total milligrams divided by the millilitres of bacteriostatic water added — and pharmacies do not all use the same pairing. A 5 mg vial made up with 1 mL is 5 mg/mL; the same 5 mg vial with 2 mL is 2.5 mg/mL, and every unit figure on it doubles. Two people on identical doses can be drawing to completely different marks.
Do Wegovy and Ozempic pens have units?: No. Wegovy and Ozempic are pre-filled, fixed-dose pens: you select a dose in milligrams and the pen delivers it. There is nothing to convert, and an insulin syringe is not used. Units only come into it when a compounded multi-dose vial is drawn with a U-100 syringe.

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