Dual GIP/GLP-1 Receptor Agonist15 mg

15 mg Tirzepatide Dosage Calculator

Convert the maximum 15 mg tirzepatide maintenance dose to exact units for your vial concentration.

Select Dose

Vial Concentration

How many units is 15 mg of Tirzepatide at 5 mg/mL?

Draw

300units

3.00 mL on a U-100 insulin syringe

15 mg ÷ 5 mg/mL × 100 = 300 units

This dose exceeds 50 units (0.5 mL). Volumes greater than 0.5 mL may be uncomfortable for subcutaneous injection. Consult your provider about splitting the dose into two injections.

For educational purposes only. Always follow your provider's instructions.

Quick Reference Table

All dose × concentration combinations

Dose	5 mg/mL	10 mg/mL	15 mg/mL	25 mg/mL	30 mg/mL	60 mg/mL	90 mg/mL	100 mg/mL
2.5 mg	50	25	16.7	10	8.3	4.2	2.8	2.5
5 mg	100*	50	33.3	20	16.7	8.3	5.6	5
7.5 mg	150*	75*	50	30	25	12.5	8.3	7.5
10 mg	200*	100*	66.7*	40	33.3	16.7	11.1	10
12.5 mg	250*	125*	83.3*	50	41.7	20.8	13.9	12.5
15 mg	300*	150*	100*	60*	50	25	16.7	15

Values in U-100 insulin syringe units

* Exceeds 50 units (0.5 mL) — may require splitting into two injections

There's an easier way

Tired of calculating doses?

We handle everything — the prescription, the right dose, and shipping straight to your door. No math, no hassle.

Get Started

2-min quiz · Free consultation · No commitment

About the 15 mg Dose

The 15 mg dose is the maximum maintenance dose for both Mounjaro and Zepbound, reached at week 21 and continued indefinitely. This is the highest approved dose of tirzepatide. Patients at this dose have completed a full 20-week titration.

Frequently Asked Questions

How many units is 15 mg tirzepatide in a 30 mg/mL vial?

In a 30 mg/mL vial, 15 mg tirzepatide equals 50 units. The math is (15 / 30) x 100 = 50 units. In a 25 mg/mL vial, it would be 60 units. In a 60 mg/mL vial, it would be 25 units.

How long does it take to reach the 15 mg maximum dose?

The standard titration schedule reaches 15 mg at week 21. The full path is: 2.5 mg (weeks 1-4), 5 mg (weeks 5-8), 7.5 mg (weeks 9-12), 10 mg (weeks 13-16), 12.5 mg (weeks 17-20), and 15 mg (weeks 21 onward). This 20-week ramp-up minimizes gastrointestinal side effects.

How much tirzepatide do I need per month at 15 mg?

At 15 mg per week, you need approximately 60 mg of tirzepatide per month (4 weekly injections). Over 3 months, that totals about 180 mg. Knowing your monthly consumption helps when evaluating vial sizes and concentration options. Higher concentration vials like 60 mg/mL or 100 mg/mL require less injection volume at this dose.

How does 15 mg tirzepatide compare to 2.4 mg semaglutide for weight loss?

Tirzepatide and semaglutide work through different receptor mechanisms — tirzepatide is a dual GIP/GLP-1 receptor agonist, while semaglutide acts on the GLP-1 receptor alone. Individual results vary significantly from person to person. Your provider can help determine which medication and dose best fit your treatment goals.

Other Tirzepatide Doses

2.5 mg Tirzepatide 5 mg Tirzepatide 7.5 mg Tirzepatide 10 mg Tirzepatide 12.5 mg Tirzepatide

Tirzepatide Calculator Tirzepatide Dosing

Ready to Get Started?

Take our 2-minute quiz to see if you qualify for GLP-1 treatment.

Start Quiz

Free consultation. No commitment.