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Semaglutide Dosage Calculator

Semaglutide is supplied as a lyophilised powder in 5 mg, 10 mg and 15 mg vials. Research doses are small relative to the vial, so the water volume you choose has a large effect on how precisely a draw can be measured.

The formula

Concentration (mg/mL) = vial strength (mg) ÷ bacteriostatic water (mL). Draw volume (mL) = dose (mg) ÷ concentration (mg/mL). On a U-100 insulin syringe, units = draw volume (mL) × 100. For Semaglutide: a 5 mg vial in 2 mL of water is 2.5 mg/mL, so a 250 mcg dose is 0.1 mL — 10 units.

Your Semaglutide vial

1 mg = 1,000 mcg

Syringe size

Your result

Draw to

10

units on a U-100 insulin syringe

= 0.1 mL

Concentration
2.5mg/mL
2,500 mcg/mL
Draws per vial
20
at 250 mcg each

For laboratory and research use only. This calculator is a unit-conversion aid and is not medical guidance or a dosing recommendation.

Buy Semaglutide — 99%+ purity, COA per lot

Semaglutide units per dose — quick reference

U-100 insulin-syringe units for each vial size we ship, reconstituted with 2 mL of bacteriostatic water.

Semaglutide insulin syringe units per dose by vial size
VialConcentration250 mcg500 mcg1 mg2 mg
5 mg2.5 mg/mL10 u20 u40 u80 u
10 mg5 mg/mL5 u10 u20 u40 u
15 mg7.5 mg/mL3.3 u6.7 u13.3 u26.7 u

How to reconstitute a Semaglutide vial

  1. 1. Bring the vial to room temperature. Let a refrigerated or frozen vial equilibrate before opening so condensation doesn't form on the powder.
  2. 2. Swab both stoppers. Wipe the Semaglutide vial and the bacteriostatic water vial with alcohol and let them dry.
  3. 3. Draw your diluent. Pull the volume you entered above into the syringe.
  4. 4. Run it down the glass wall. Angle the needle so water flows down the side of the vial rather than jetting onto the peptide cake — shear and foaming degrade peptides.
  5. 5. Swirl, never shake. Roll the vial gently until fully clear. Do not vortex or shake.
  6. 6. Label and refrigerate. Mark the date and concentration, then store at 2-8 °C away from light.

Semaglutide calculator FAQs

How many units is 250 mcg of semaglutide from a 5 mg vial?

A 5 mg vial with 2 mL of bacteriostatic water is 2.5 mg/mL (2,500 mcg/mL). A 250 mcg draw is 0.1 mL — 10 units on a U-100 insulin syringe, and the vial holds 20 draws.

How do you calculate a Semaglutide dose in syringe units?

Divide the vial strength by the bacteriostatic water you added to get the concentration: concentration (mg/mL) = vial mg ÷ water mL. Then draw volume (mL) = dose (mg) ÷ concentration. On a U-100 insulin syringe, 1.0 mL is 100 units, so units = draw volume × 100.

Does adding more water change how much Semaglutide is in the vial?

No. The vial holds a fixed mass of lyophilised powder. More bacteriostatic water only dilutes it — each syringe unit carries less compound and the draw volume for the same dose gets larger, which can make small doses easier to measure accurately.

How is reconstituted Semaglutide stored?

After reconstitution with bacteriostatic water, research peptides are kept refrigerated at 2-8 °C, protected from light, and away from freeze-thaw cycles. Unreconstituted lyophilised vials are far more stable and are typically stored frozen.

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