GLP-1 Dose Calculator

Compounded GLP-1 medications require you to calculate syringe units from your prescribed milligram dose and vial concentration. Dosy's built-in calculator does this conversion instantly — but always verify with your provider.

The problem

Why GLP-1 Dosing Math Matters

With pre-filled pens (Ozempic^®, Mounjaro^®), you dial or click to your dose — the pen handles the math. With compounded GLP-1 vials, you must calculate how many syringe units to draw based on three variables:

Your prescribed dose (mg)

The milligram amount your provider prescribed — e.g., 0.5 mg, 1.25 mg, 2.5 mg. This is what you need to deliver.

Your vial concentration (mg/mL)

How much active ingredient is dissolved per milliliter of solution. This varies by compounding pharmacy — e.g., 2.5 mg/mL, 5 mg/mL, 10 mg/mL.

Your syringe calibration (units/mL)

Standard insulin syringes are calibrated at 100 units per 1 mL. This means 10 units = 0.1 mL, 50 units = 0.5 mL, etc.

Educational

How the Conversion Works

The fundamental relationship between dose, concentration, and volume:

The formula (for 100-unit/mL insulin syringes):

Volume (mL) = Dose (mg) ÷ Concentration (mg/mL)
Syringe units = Volume (mL) × 100

Illustrative examples:

Dose	Concentration	Volume	Units
0.5 mg	5 mg/mL	0.1 mL	10 units
1.0 mg	5 mg/mL	0.2 mL	20 units
2.5 mg	5 mg/mL	0.5 mL	50 units
0.5 mg	2.5 mg/mL	0.2 mL	20 units
1.25 mg	2.5 mg/mL	0.5 mL	50 units

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Critical safety note: These examples are for educational illustration ONLY. Your actual dose, concentration, and draw volume must be confirmed by your prescribing provider and match the label on your specific vial. Concentrations vary between compounding pharmacies. Syringe types vary. A calculation error can result in significantly over- or under-dosing. Never calculate your own dose without provider guidance.

Dosy feature

Dosy's Built-In Dose Calculator

Enter your concentration once — Set your vial's mg/mL concentration from the pharmacy label. Dosy remembers it for all future calculations.

Instant unit conversion — Enter your prescribed mg dose and immediately see the syringe units to draw. No manual math or mental arithmetic.

Vial inventory integration — The calculator works with Dosy's inventory tracking — it knows how much is left in your vial and alerts you before you run out.

Supports all concentrations — Works with any mg/mL concentration from any compounding pharmacy. Update it when you get a new vial with a different concentration.

⚠️

Dosy's calculator is a convenience tool to reduce arithmetic errors. It is NOT a substitute for your provider's dosing instructions. Always verify the calculator's output against your provider's prescribed dose and your vial label before injecting.

Medical Disclaimer

Dosy Health is an educational and tracking tool only. It does not provide medical advice, diagnosis, or treatment recommendations. All dosing decisions must be made by your healthcare provider.

Do not rely on any app, including Dosy, as a substitute for professional medical guidance. Always confirm your dose and injection instructions with your prescribing provider and pharmacist.

Dosy Health is not affiliated with, endorsed by, or associated with Novo Nordisk (manufacturer of Ozempic^®, Wegovy^®, Saxenda^®, and Victoza^®), Eli Lilly (manufacturer of Mounjaro^®, Zepbound^®, Trulicity^®, and Foundayo^®), or any compounding pharmacy.

Calculate Your Dose Instantly

Free dose calculator built into Dosy. Works with any compounding pharmacy concentration.

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Sources

U.S. Food & Drug Administration. "Compounding and the FDA: Questions and Answers." FDA.gov
BD (Becton, Dickinson and Company). "Understanding Insulin Syringes." BD.com — Reference for standard syringe calibrations (100 units/mL).
21 U.S.C. § 353a (Section 503A) and § 353b (Section 503B) — Federal Food, Drug, and Cosmetic Act provisions governing pharmacy compounding.
Institute for Safe Medication Practices (ISMP). "Syringe Dose Calculation Errors." ISMP Medication Safety Alert, 2022.