Calculate semaglutide dose volume and U-100 syringe units from total mg and pharmacist-confirmed final volume, or work out final volume and dilutions.

Final volume is not automatically equal to water added.

Read the size printed on your syringe; U-100 scale = 100 marks per mL.

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Important: This tool is for general math/education only and is not medical advice. It does not determine your dose. Do not prepare, dilute, or measure semaglutide injections based on this page unless a licensed prescriber/pharmacist has instructed you and you have verified the exact product concentration and directions on your dispensing label. Do not use for branded pens (e.g., Ozempic/Wegovy). If you suspect an overdose or severe symptoms, seek urgent care or contact Poison Control.

Related Calculators

Semaglutide Dilution Formula

The following formula is used to calculate the final total solution volume after diluting a semaglutide solution (mass balance: the amount of drug stays the same before and after dilution).

SD = (V1 × C1) / C2

Variables:

  • SD is the final total volume of the diluted solution (V2)
  • V1 is the initial volume of the solution
  • C1 is the initial concentration of the solution
  • C2 is the desired final concentration

To calculate the final total volume required, multiply the initial volume by the initial concentration, then divide by the desired final concentration. The result is the final total solution volume, not automatically the amount of water to add. For an existing solution, the ideal volume increase is V2 − V1, assuming additive volumes and no drug loss. This arithmetic does not establish a compatible diluent or preparation method.

What is a Semaglutide Dilution?

Semaglutide dilution is the process of lowering the concentration of a semaglutide solution by adding a compatible diluent (for example, sterile diluent used for reconstitution). This concept is commonly discussed for reconstituted or multi‑dose vials where a specific concentration is needed to measure small doses accurately. It is not a routine step for FDA‑approved, ready‑to‑use semaglutide injection products (such as branded pens); do not dilute or alter those products unless a licensed prescriber and the product instructions specifically direct you to.

How to Calculate Semaglutide Dilution?

The following steps outline how to calculate the Semaglutide Dilution.

  1. First, determine the initial volume of the semaglutide solution (V1).
  2. Next, determine the initial concentration of the solution (C1).
  3. Next, determine the desired final concentration (C2).
  4. Next, use the formula SD = (V1 * C1) / C2 to calculate the final total volume of solution required (SD or V2).
  5. Finally, insert the values of V1, C1, and C2 into the formula and calculate the result for SD.

Example Problem:

The following is a hypothetical mass-balance example, not preparation or dosing instructions:

Initial volume of Semaglutide (V1) = 10 mL

Initial concentration of Semaglutide (C1) = 5 mg/mL

Final concentration in the example (C2) = 2 mg/mL. Final total volume = 10 × 5 ÷ 2 = 25 mL; the ideal volume increase is 25 − 10 = 15 mL. These example values are not a treatment recommendation.