Tirzepatide Dose Calculator
Convert mg/mL to Syringe Units
Use this free tirzepatide dose calculator to convert a prescribed dose and vial concentration (mg/mL or mg/0.5 mL) into syringe units, based on your specific formulation.
Calculate Your Dose
Finding Your Tirzepatide Concentration
Think of concentration as the strength of the medication. A higher-concentration vial contains more medication in each milliliter.
What to look for on your vial label
Find a number followed by:
- mg/mL (for example, 15 mg/mL), or
- mg/0.5 mL (for example, 7.5 mg/0.5 mL)
Enter the value exactly as shown on your label. If needed, use the unit toggle above the concentration field — the calculator will handle the conversion.
Simple example
- If your vial says 15 mg/mL, then 1 mL (100 units) contains 15 mg of medication.
- If your prescribed dose is 15 mg, you would draw 1 mL (100 units).
- If your vial says 7.5 mg/0.5 mL, switch the calculator to mg/0.5 mL, enter 7.5, and the calculator will do the rest.
Understanding Volume, Concentration, and Units
Dosage (mg)
The dosage is the amount of medication you intend to take, measured in milligrams (mg). This is not the same as the volume you inject. Prescriptions for tirzepatide (including Mounjaro and Zepbound) are written in mg.
Volume (mL)
The volume is the amount of liquid you inject, measured in milliliters (mL). How much medication is contained in that liquid depends entirely on the concentration of your vial.
Concentration (mg/mL or mg/0.5 mL)
Concentration tells you how much medication is packed into each amount of liquid.
- mg/mL means milligrams per 1 milliliter
- mg/0.5 mL means milligrams per half a milliliter
For example: A vial labeled 10 mg/mL contains 10 mg of medication in every 1 mL. A vial labeled 7.5 mg/0.5 mL contains 7.5 mg in every 0.5 mL.
Units
Units are another way to measure volume when using insulin syringes. On a standard U-100 insulin syringe:
- 1 mL = 100 units
- 0.5 mL = 50 units
Frequently Asked Questions
Answers to common questions about tirzepatide dosing
What is a tirzepatide dose calculator?
A tirzepatide dose calculator converts a prescribed dose in milligrams (mg) and a vial concentration (mg/mL or mg/0.5 mL) into the correct syringe units to draw.
Does this work for Mounjaro® and Zepbound®?
Yes. This calculator supports tirzepatide dosing for both Mounjaro® and Zepbound®, as well as compounded tirzepatide formulations.
Can I use this for compounded tirzepatide?
Yes. As long as you know the concentration listed on your vial, the calculator can convert the dose into mL and syringe units.
What type of syringe does this assume?
The calculator assumes a standard U-100 insulin syringe, where 100 units equal 1 mL.
Data Sources
This calculator uses standard pharmaceutical dosing formulas and FDA-approved references:
- U-100 Syringe Standard — FDA Insulin Delivery Device Guidance (100 units = 1 mL)
- Tirzepatide Prescribing Information — FDA NDA 215866, Mounjaro Clinical Pharmacology Review
- Volume Calculation Formula — Standard pharmaceutical formula: Units = (Dose mg ÷ Concentration mg/mL) × 100
⚠️ Important Medical Disclaimer
This calculator is for informational purposes only and does not constitute medical advice. Always consult with your healthcare provider before making any changes to your medication dosing.
Dosage calculations should be verified by a healthcare professional. Glapp and its contributors assume no liability for medication dosing errors or adverse events.
Off-Label Use Notice: Split dosing features represent off-label use not approved by the FDA. Discuss with your prescriber before implementing.