How many units is 0.25 mg of semaglutide?

At 2.5 mg/mL, 0.25 mg = 10 units (0.1 mL). At 5 mg/mL it is 5 units. Enter your vial concentration to get the exact number.

Why is my semaglutide volume so small?

Semaglutide doses are in fractions of a milligram, so even at a low concentration the volume is small — often just 5–20 units. Draw carefully and verify against your label.

Can I use this for Ozempic or Wegovy pens?

No. The branded pens dial or deliver a set dose. This tool is for compounded semaglutide drawn from a vial with a U-100 syringe.

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Semaglutide Dose Calculator

Milligrams to syringe units for compounded semaglutide.

Vial concentrationmg/mL

Prescribed doseSemaglutide · Ozempic · Wegovymg

Draw to

10units

Exact units

10u

Volume

0.1mL

Always verify against your vial and pharmacy label. Concentrations differ between products and batches — a vial reading 5 mg / 0.5 mL is 10 mg/mL, not 5. If your number here doesn't match what your prescriber told you, stop and call your pharmacy.

Converting semaglutide mg to units

Compounded semaglutide (the molecule in Ozempic and Wegovy) is measured in mg but drawn in units on an insulin syringe. Because semaglutide doses are small, vials are usually a low concentration (1–5 mg/mL), so a typical dose is only a fraction of a mL.

units = (dose_mg ÷ concentration_mg/mL) × 100

Double-check the concentration

A vial marked 2.5 mg / mL and one marked 5 mg / mL need very different volumes for the same dose. Enter your exact concentration — or derive it from the powder and water if your vial was reconstituted — and verify against the pharmacy label before injecting.

Frequently asked

How many units is 0.25 mg of semaglutide?: At 2.5 mg/mL, 0.25 mg = 10 units (0.1 mL). At 5 mg/mL it is 5 units. Enter your vial concentration to get the exact number.
Why is my semaglutide volume so small?: Semaglutide doses are in fractions of a milligram, so even at a low concentration the volume is small — often just 5–20 units. Draw carefully and verify against your label.
Can I use this for Ozempic or Wegovy pens?: No. The branded pens dial or deliver a set dose. This tool is for compounded semaglutide drawn from a vial with a U-100 syringe.

Medical disclaimer. Tiro is a tracking companion, not a medical device, and nothing on this site is medical advice. Always follow the titration schedule and dosing instructions from your prescriber. Never change your dose without talking to them first.