Why does the number of units change depending on concentration?

The unit marking on the syringe always represents 0.01 mL. If your concentration is higher (more mg per mL), you need less liquid — and therefore fewer units — to get the same dose. That's why the concentration you set at reconstitution directly affects how many units you draw.

Semaglutide Units Converter

Convert semaglutide doses from mg to insulin syringe units instantly. Enter your vial concentration and desired dose to get the exact number of units to draw — no guesswork.

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Semaglutide units chart

Syringe units for common semaglutide doses across typical reconstitution concentrations. All values assume a standard U-100 insulin syringe (1 unit = 0.01 mL).

Dose	0.5 mg/mL	1 mg/mL	2 mg/mL	2.5 mg/mL
0.25 mg (250 mcg)	50 units0.500 mL	25 units0.250 mL	12.5 units0.125 mL	10 units0.100 mL
0.5 mg (500 mcg)	100 units1.000 mL	50 units0.500 mL	25 units0.250 mL	20 units0.200 mL
1 mg (1000 mcg)	200 units2.000 mL	100 units1.000 mL	50 units0.500 mL	40 units0.400 mL
1.7 mg (1700 mcg)	340 units3.400 mL	170 units1.700 mL	85 units0.850 mL	68 units0.680 mL
2.4 mg (2400 mcg)	480 units4.800 mL	240 units2.400 mL	120 units1.200 mL	96 units0.960 mL

Concentration is set at reconstitution: divide vial size (mg) by BAC water added (mL). E.g., 5 mg vial + 2 mL BAC water = 2.5 mg/mL.

Semaglutide units to mg chart

Already know how many units you drew? Use this chart to find the corresponding dose in mg. All values assume a U-100 insulin syringe (1 unit = 0.01 mL).

Units drawn	@ 0.5 mg/mL → mg	@ 1 mg/mL → mg	@ 2 mg/mL → mg	@ 2.5 mg/mL → mg
10 units0.10 mL	0.050 mg50 mcg	0.100 mg100 mcg	0.200 mg200 mcg	0.250 mg250 mcg
12.5 units0.13 mL	0.063 mg63 mcg	0.125 mg125 mcg	0.250 mg250 mcg	0.313 mg313 mcg
15 units0.15 mL	0.075 mg75 mcg	0.150 mg150 mcg	0.300 mg300 mcg	0.375 mg375 mcg
20 units0.20 mL	0.100 mg100 mcg	0.200 mg200 mcg	0.400 mg400 mcg	0.500 mg500 mcg
25 units0.25 mL	0.125 mg125 mcg	0.250 mg250 mcg	0.500 mg500 mcg	0.625 mg625 mcg
40 units0.40 mL	0.200 mg200 mcg	0.400 mg400 mcg	0.800 mg800 mcg	1 mg1000 mcg
50 units0.50 mL	0.250 mg250 mcg	0.500 mg500 mcg	1 mg1000 mcg	1.250 mg1250 mcg
75 units0.75 mL	0.375 mg375 mcg	0.750 mg750 mcg	1.500 mg1500 mcg	1.875 mg1875 mcg
100 units1.00 mL	0.500 mg500 mcg	1 mg1000 mcg	2 mg2000 mcg	2.500 mg2500 mcg

Formula: units ÷ 100 = mL; mL × concentration = mg dose. Use the “units → mg” toggle in the converter above for any value.

How to convert semaglutide mg to units

Semaglutide for weight loss is typically prescribed as a compounded injectable peptide. It comes as a lyophilized (freeze-dried) powder in a vial, which you reconstitute by adding bacteriostatic water (BAC water). The amount of BAC water you add determines your concentration.

Once you know your concentration (mg/mL), converting a dose to syringe units is straightforward:

Formula

mL = dose (mg) ÷ concentration (mg/mL)

Units = mL × 100

Example: 0.25 mg at 2 mg/mL

0.25 mg ÷ 2 mg/mL = 0.125 mL

0.125 mL × 100 = 12.5 units

The standard semaglutide titration protocol starts at 0.25 mg per week for the first four weeks, then increases to 0.5 mg weekly, and may escalate further based on clinical response. Use the titration calculator to generate a complete week-by-week schedule.

Frequently Asked Questions

How many units is 0.25 mg of semaglutide?

It depends on your concentration. At 2 mg/mL: 12.5 units. At 1 mg/mL: 25 units. At 2.5 mg/mL: 10 units. At 0.5 mg/mL: 50 units. Use the converter above for any concentration.

How many units is 0.5 mg of semaglutide?

At 2 mg/mL: 25 units. At 2.5 mg/mL: 20 units. At 1 mg/mL: 50 units. At 0.5 mg/mL: 100 units (requires a full 1 mL syringe).

How many units is 1 mg of semaglutide?

At 2 mg/mL: 50 units. At 2.5 mg/mL: 40 units. At 1 mg/mL: 100 units (a full 1 mL syringe). At 0.5 mg/mL: 200 units — this exceeds any single syringe and would require splitting into two injections.

How many units is 1.7 mg of semaglutide?

At 2 mg/mL: 85 units. At 2.5 mg/mL: 68 units. At 1 mg/mL: 170 units (requires two injections). At 2 mg/mL you can fit this in a 1 mL (100-unit) syringe.

How many units is 2.4 mg of semaglutide (maximum dose)?

At 2.5 mg/mL: 96 units (fits in a 1 mL syringe). At 2 mg/mL: 120 units (requires a second injection or a higher concentration). At 1 mg/mL: 240 units (requires multiple injections).

What does semaglutide concentration mean?

Concentration (mg/mL) tells you how much semaglutide is dissolved in each mL of solution. A 5 mg vial with 2 mL of BAC water gives 2.5 mg/mL. A 5 mg vial with 1 mL gives 5 mg/mL. A higher concentration means fewer units per dose.

What syringe size should I use for semaglutide?

For most weekly doses of 0.25–0.5 mg at 2 mg/mL concentration (12.5–25 units), a 0.3 mL (30-unit) or 0.5 mL (50-unit) insulin syringe works well. Higher doses like 1–2.4 mg at 2+ mg/mL concentration will require a 1 mL (100-unit) syringe.

Can I use this for compounded semaglutide?

Yes. Compounded semaglutide is typically supplied as lyophilized powder you reconstitute at home, or as a pre-mixed solution. Enter your actual concentration from your pharmacy label to get the correct unit amount.

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Medical disclaimer: This tool is provided for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Semaglutide dosing should be supervised by a licensed healthcare provider. Always consult your prescribing physician before adjusting any dose.