How do I count clicks on a tirzepatide pen?

Turn the dial and count the audible/tactile clicks up to the number this calculator gives you. On a 1-click-per-unit pen the clicks equal the U-100 units for your dose.

What if my pen uses 2 units per click?

Then halve the click count from a 1-unit pen. Always confirm your pen’s click ratio with the pharmacy before dosing — getting it wrong doubles or halves your dose.

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Zepbound Pen Clicks

Match pen clicks to your prescribed Zepbound dose.

Vial concentrationmg/mL

Prescribed doseTirzepatide · Mounjaro · Zepboundmg

Pen clicks

10clicks

On a U-100 syringe

10units

Volume

0.104mL

Always verify against your vial and pharmacy label. Concentrations differ between products and batches — a vial reading 5 mg / 0.5 mL is 10 mg/mL, not 5. If your number here doesn't match what your prescriber told you, stop and call your pharmacy.

Counting Zepbound pen clicks

When tirzepatide is dispensed in a click-dosing pen, you set the dose by counting clicks. On standard U-100 pens each click is one unit, so:

clicks = (dose_mg ÷ concentration_mg/mL) × 100

Enter your prescribed dose and the pen's concentration to get the click count — then double-check it matches the instructions that came with your pen.

Frequently asked

How do I count clicks on a tirzepatide pen?: Turn the dial and count the audible/tactile clicks up to the number this calculator gives you. On a 1-click-per-unit pen the clicks equal the U-100 units for your dose.
What if my pen uses 2 units per click?: Then halve the click count from a 1-unit pen. Always confirm your pen’s click ratio with the pharmacy before dosing — getting it wrong doubles or halves your dose.

Medical disclaimer. Tiro is a tracking companion, not a medical device, and nothing on this site is medical advice. Always follow the titration schedule and dosing instructions from your prescriber. Never change your dose without talking to them first.