Tirzepatide Calculator (mg → mL → units)
A unit-conversion tool. Your dose and schedule come only from your prescriber and the FDA-approved labeling — this page does not suggest or summarize dosing.
Approved products and where the official information is
Tirzepatide is FDA-approved under the brand names Mounjaro and Zepbound (Eli Lilly). Dosage, titration, administration and storage are defined in each product's Prescribing Information and Instructions for Use. Read them at the source:
The branded products come as pens or vials with fixed strengths stated on the label (listed below), intended to be used as supplied. If you use one of these, follow the Instructions for Use rather than a calculator. Ask your pharmacist if anything on the label is unclear.
Dosage forms and strengths — FDA label, Section 3 (verbatim)
"Injection: Clear, colorless to slightly yellow solution in pre-filled single-dose pens, single-dose vials, multi-dose vials, or single-patient-use KwikPens, each available in the following strengths. The multi-dose vials and single-patient-use KwikPen each contain 4 doses:"
| Single-dose Pen or Vial |
|---|
| 2.5 mg/0.5 mL |
| 5 mg/0.5 mL |
| 7.5 mg/0.5 mL |
| 10 mg/0.5 mL |
| 12.5 mg/0.5 mL |
| 15 mg/0.5 mL |
| Multi-dose Vial / Single-Patient-Use KwikPen (4 doses) Dose per Injection | Total Strength per Total Volume | Strength per mL |
|---|---|---|
| 2.5 mg (vial: 2.5 mg/0.6 mL) | 10 mg/2.4 mL | 4.17 mg/mL |
| 5 mg (vial: 5 mg/0.6 mL) | 20 mg/2.4 mL | 8.33 mg/mL |
| 7.5 mg (vial: 7.5 mg/0.6 mL) | 30 mg/2.4 mL | 12.5 mg/mL |
| 10 mg (vial: 10 mg/0.6 mL) | 40 mg/2.4 mL | 16.7 mg/mL |
| 12.5 mg (vial: 12.5 mg/0.6 mL) | 50 mg/2.4 mL | 20.8 mg/mL |
| 15 mg (vial: 15 mg/0.6 mL) | 60 mg/2.4 mL | 25 mg/mL |
Source: MOUNJARO and ZEPBOUND (tirzepatide) Prescribing Information, Section 3, Eli Lilly and Company, as published on DailyMed (SPL version 40, Sep 02, 2026; both labels list identical strengths). Table reproduced from the label; check DailyMed for the current version.
Unit conversion
If your pharmacist has given you a liquid with a stated concentration and an amount to measure, this converts it to syringe units. Enter the vial total and volume exactly as printed on your label.
Arithmetic example: a liquid labeled 10 mg per 1 mL, entered amount 2 mg → 2 ÷ 10 = 0.2 mL = 20 units on a U-100 syringe. (Example numbers only.)
What this page will not do
- Recommend a starting amount, titration schedule, or weight-loss plan.
- Point to any seller, compounding source, or "research" product.
- Tell you whether a non-labeled product is equivalent to an FDA-approved one.
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