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To convert a tirzepatide dose to syringe units, divide the dose in milligrams by your solution’s concentration in mg/mL, then multiply by 100. Example: at 10 mg/mL, a 5 mg dose is 50 units on a U-100 syringe. Commercial Zepbound and Mounjaro come pre-mixed as fixed single doses, so this arithmetic is only for a self-reconstituted research solution. This is arithmetic only, not medical advice — verify any dose with a licensed clinician.
Tirzepatide reconstitution & dosage calculator X
Reconstitution / draw volume / syringe units / supply-chain
Arithmetic checks out. Confirm clinically, against the label, and against the actual vial before any use.
Independent check - dose mg / concentration mg/mL = volume. U-100 units = mL x 100.
Start 2.5 mg weekly; labeled maintenance 5, 10, or 15 mg weekly; max 15 mg
Commercial Zepbound is supplied pre-mixed in fixed-dose pens/vials. Use actual product concentration; do not invent a reconstitution.
Prescription-only; indication, titration, contraindications, interactions and monitoring are outside this calculator.
FDA prescribing information (Tirzepatide) - accessdata.fda.govSupply-chain signal only - not a potency guarantee. Enter the COA's tested mg and purity above so the math reflects the real vial.
View on finnrick.comReverse: pick a dose and the units you want it to read, then calculate diluent to add.
Same-syringe co-draw. Reconstitute each peptide in its own vial, then draw them into one syringe.
- Reconstitute each peptide in its own vial — never add water to multiple peptides in one vial.
- Only co-draw peptides with the same diluent (e.g. both bacteriostatic water) and compatible pH.
- Draw and inject fresh — do not pre-mix and store; mixture stability is not established.
- No blended stack is clinically validated. Verify each component and confirm with a clinician.
Tirzepatide dose to syringe units: reference chart
| Vial + water | Concentration | Units per 1 mg | 2.5 mg | 5 mg | 10 mg | 15 mg |
|---|---|---|---|---|---|---|
| 10 mg + 1 mL | 10 mg/mL | 10 | 25 | 50 | 100 | 150 |
| 10 mg + 2 mL | 5 mg/mL | 20 | 50 | 100 | 200 | 300 |
| 10 mg + 3 mL | 3.33 mg/mL | 30 | 75 | 150 | 300 | 450 |
| 15 mg + 1 mL | 15 mg/mL | 6.7 | 16.7 | 33.3 | 66.7 | 100 |
| 15 mg + 2 mL | 7.5 mg/mL | 13.3 | 33.3 | 66.7 | 133.3 | 200 |
| 15 mg + 3 mL | 5 mg/mL | 20 | 50 | 100 | 200 | 300 |
| 30 mg + 1 mL | 30 mg/mL | 3.3 | 8.3 | 16.7 | 33.3 | 50 |
| 30 mg + 2 mL | 15 mg/mL | 6.7 | 16.7 | 33.3 | 66.7 | 100 |
| 30 mg + 3 mL | 10 mg/mL | 10 | 25 | 50 | 100 | 150 |
Concentration = vial strength divided by the bacteriostatic water added. On a U-100 syringe 100 units = 1 mL, so units = (dose divided by concentration) x 100. Values are syringe units, not milligrams. Amber values exceed 100 units, which is more than one standard 1 mL U-100 syringe holds, so that combination needs a more concentrated solution. Columns are the dose steps named on the current FDA label - they describe what has been studied or labeled, not what anyone should take, and this page gives no dosing advice. Multiply the units-per-1-mg figure by your own dose in milligrams to convert any amount. For vial sizes or doses not shown here, use the general mg to units converter.
Sources
- FDA prescribing information (Tirzepatide) - accessdata.fda.govCurrent regulator label. Basis for the regulatory status, route, frequency and published range shown on this page, and for the dose columns in the chart above. Source last checked 2026-06-24
Frequently asked questions
What is tirzepatide, and how is it regulated?
Tirzepatide is a dual GIP/GLP-1 receptor agonist sold as the prescription products Mounjaro (type 2 diabetes) and Zepbound (chronic weight management), both FDA-approved. This page reproduces figures from the Zepbound prescribing information (FDA application 217806). Those branded products ship as pre-mixed, fixed-dose pens or single-dose vials; this tool only handles the mg-to-unit arithmetic for self-reconstituted research vials, not the finished pharmaceuticals.
Which tirzepatide research-vial sizes does this tool handle?
The calculator works from your solution’s concentration in mg/mL, so it handles any research-vial size. Research-grade tirzepatide is commonly sold as 10, 15, or 30 mg of lyophilized powder that is reconstituted into a solution before use; whatever the vial size, you enter the resulting concentration and your intended dose, and the calculator returns U-100 units. These unregulated research vials are not the same as the pre-filled, pre-mixed Mounjaro or Zepbound pens, which are dispensed ready to inject.
Why doesn’t a branded Mounjaro or Zepbound pen need any conversion here?
The commercial pens and single-dose vials are pre-mixed at a fixed strength and dispensed ready to inject, so you use the labeled dose directly — 2.5 mg to start, then 5, 10, or up to a 15 mg weekly maximum — with no unit math and no reconstitution. This page’s conversion applies only to a research solution you prepared yourself, where you supply the concentration in mg/mL.
How does this tool express a tirzepatide dose in syringe units?
Enter your solution’s concentration in mg/mL and your intended dose in milligrams, and it converts the dose to U-100 insulin-syringe units, where 100 units equals 1 mL. This is a straight arithmetic conversion for the concentration you supply. For selecting or reading the syringe barrel itself, use the /tools/insulin-syringe-calculator.
Does entering my numbers here tell me the right tirzepatide dose to take?
No. This is arithmetic only: it converts a milligram amount you already have into U-100 syringe units and is not medical advice. The appropriate tirzepatide dose, titration pace, and whether the drug is suitable for you are decisions for a licensed clinician — verify any figure with them and against the FDA label before acting.