Tirzepatide Dosage Calculator
Enter the concentration printed on your liquid vial and the amount in your written prescription. See the calculated mL and equivalent U-100 syringe volume markings. This is a conversion check, not a way to choose a dose.
- 1Check vial mg/mL
- 2Enter prescribed mg
- 3Review volume math
A QUICK WALKTHROUGH
How the Tirzepatide Dosage Calculator works
This calculator checks a concentration-to-volume conversion using your own labeled values. It cannot verify the vial or decide whether the prescription is correct.
Read the exact vial concentration
Enter mg/mL from the liquid vial label. Total vial mg is not the same as mg/mL.
Enter the prescribed amount
Use only the milligram amount on your own written prescription. Do not use this tool to choose or change it.
Select the U-100 syringe capacity
Choose 0.3, 0.5 or 1 mL. These all use the same U-100 volume scale, with different maximum capacities.
Compare the calculated volume
The result shows mL and equivalent U-100 markings. Confirm the label, device and instructions with your pharmacist before any administration.
Tirzepatide mg to mL and U-100 units formula
Volume (mL) = prescribed amount (mg) ÷ concentration on the vial (mg/mL). For a U-100 syringe, volume markings = mL × 100. Syringe markings describe volume, not milligrams of tirzepatide. A different vial concentration changes the result even when the prescribed mg stays the same.
A concentration-specific example
For a hypothetical liquid vial labeled 10 mg/mL, an entered 2.5 mg amount mathematically corresponds to 0.25 mL, or 25 U-100 volume markings. If the label instead says 5 mg/mL, that same 2.5 mg corresponds to 0.5 mL, or 50 markings. Neither example verifies a product or recommends a dose. Always use the concentration on the actual vial and the instructions from your care team.
What this calculator cannot do
This page is not for Zepbound or Mounjaro pen clicks, tablets, reconstitution, unknown vial concentrations, or non-U-100 syringes. Approved tirzepatide products have different presentations and their own instructions. Lilly's product guidance shows that vial and pen directions differ. Do not use a vial conversion to override those directions.
The FDA warns about unapproved GLP-1 products, including compounded tirzepatide, and the potential for dosing errors. This calculator cannot verify sterility, contents, concentration or legal status. If a vial label is unclear or does not match the prescription, contact your dispensing pharmacist before using it.
Tirzepatide Dosage Calculator FAQs
What does the tirzepatide dosage calculator calculate?
It divides an entered prescribed amount in mg by the exact labeled liquid concentration in mg/mL. The result is mL; multiplying that volume by 100 gives U-100 syringe volume markings. It does not select a dose.
How many U-100 units is 2.5 mg of tirzepatide?
There is no single answer. It depends on the concentration printed on the specific vial. For a hypothetical 10 mg/mL vial, 2.5 mg mathematically equals 0.25 mL or 25 U-100 markings. That example is not a recommendation or a substitute for your prescription.
How many U-100 units is 5 mg of tirzepatide?
The conversion depends on the vial concentration. For a hypothetical 10 mg/mL vial, 5 mg is 0.5 mL or 50 U-100 markings. A different mg/mL gives a different marking count. Confirm your actual label and instructions with your pharmacist.
Is 20 units of tirzepatide always the same mg dose?
No. Twenty U-100 markings indicate 0.2 mL of liquid, not a fixed number of milligrams. Multiply 0.2 mL by your vial’s labeled mg/mL to calculate the corresponding mg.
Does syringe size change the calculated tirzepatide amount?
No. The 0.3, 0.5 and 1 mL options all assume a U-100 scale. Syringe size changes the illustrated capacity, not the calculated mL or mg. The tool withholds a result when it exceeds the selected capacity.
Can I use this tirzepatide calculator for Zepbound or Mounjaro pens?
No. This tool is for liquid-vial concentration arithmetic only. Pens have their own device-specific instructions, and this page cannot convert pen clicks or replace the approved product directions.
Can I enter total vial mg instead of mg/mL?
No. Enter the concentration in mg/mL on the label. Total mg in a vial is different from mg per mL. If the label only shows total mg and volume, ask the dispensing pharmacist to confirm the correct concentration before using this tool.
How much BAC water should I add to tirzepatide?
This calculator does not give reconstitution or mixing instructions. Approved tirzepatide products have specific ready-to-use presentations. Do not add liquid or alter a product based on a calculator.
Is this a tirzepatide dose recommendation?
No. It is a unit conversion using numbers you supply. Only your prescriber can determine a suitable dose, and your pharmacist should confirm the product concentration and device instructions.
Sources
Sources checked . Educational arithmetic only, not medical advice or a dosing instruction. GLP Buddy is not affiliated with Eli Lilly.