Tirzepatide units calculator

Tirzepatide units = dose (mg) ÷ vial concentration (mg/mL) × 100. Pick your vial's strength and your prescribed dose below, or type any values.

How to use it

1. Read the concentration on your vial or pharmacy label (mg/mL). If the label gives mg and mL separately, choose amount in the vial + liquid added and enter both.
2. Enter the weekly dose your prescriber gave you, in mg.
3. Draw to the number of units shown. The drawn syringe shows where the line falls and which barrel size fits.

The formula, worked through

dose 5 mg, vial 15 mg/mL 5 ÷ 15 = 0.333 mL 0.333 × 100 = 33.3 units

33.3 units is between lines on every syringe, so the calculator also shows the nearest marking (33 on a 0.5 mL syringe). Small differences like this are why your pharmacy may choose a concentration that gives round numbers; ask them if you aren't sure how to round.

All doses at a glance

The tirzepatide dosage chart lists the label schedule from 2.5 mg to 15 mg, with units and mL for 5, 10, 15, 17, 20 and 30 mg/mL vials in one table you can print.

When the units are over 100

A U-100 syringe holds at most 100 units (1 mL). If the calculator says more, the dose and concentration don't fit one syringe, which usually means a value was entered wrong. Check the label again and talk to your pharmacist; don't split the dose across syringes unless they tell you to.