PeptideCalculations
GLP-1/GIP dual agonist · 5 mg / 10 mg / 15 mg / 30 mg vials

Tirzepatide calculator

Tirzepatide is the dual GIP/GLP-1 agonist sold as Zepbound and Mounjaro. The FDA label starts at 2.5 mg once a week for 4 weeks, moves to 5 mg, and then allows 2.5 mg steps after at least 4 weeks at each dose, up to 15 mg.

mL
Draw to
—units
— mL on a U-100, 1 mL barrel
Concentration
—mg/mL
— mcg per unit
Doses in the vial
—
of
Tirzepatide dosage
2.5 mg to 15 mgper week · FDA label
Frequency
once weekly
Timing
any time of day, with or without food; keep at least 3 days between doses if you move the day
Cycle
continuous while in use; the SURMOUNT trials ran 72 weeks and weight returns after stopping
Route
subcutaneous, abdomen or thigh, or the back of the upper arm if someone else injects; rotate sites
Easy mix
10 mg + 1 mL = 10 mg/mL, so 2.5 mg = 0.25 mL = 25 units; 5 mg = 50 units, 7.5 mg = 75 units. For 10 mg and above use a 2 mL reconstitution on a 20 mg or larger vial or draw twice.

Full Tirzepatide dosage chart →

Tirzepatide units chart

10 mg vial. Rows are doses; columns show the units to draw on a U-100 syringe at each water volume.

10 mg vial + 1 mL = 10 mg/mL (10,000 mcg/mL, 100 mcg per unit on U-100)
DosemLU-100 unitsDoses per vial
100 mcg0.011100
200 mcg0.02250
250 mcg0.0252.540
500 mcg0.05520
1 mg0.11010
2 mg0.2205
2.5 mg0.25254
5 mg0.5502
10 mg11001

Other mixes: 10 mg + 2 mL · 10 mg + 3 mL · 5 mg + 2 mL · 15 mg + 2 mL · 30 mg + 2 mL

Tirzepatide questions

How many units is 2.5 mg of tirzepatide?

It depends on the vial. A 10 mg vial reconstituted with 1 mL is 10 mg/mL, so 2.5 mg is 25 units on a U-100 syringe and 5 mg is 50 units. A 10 mg vial with 2 mL is 5 mg/mL, so 2.5 mg becomes 50 units. Always run the math for your own vial.

Tirzepatide dosage chart by week?

Label schedule: 2.5 mg for weeks 1 to 4, 5 mg for weeks 5 to 8, then optional 2.5 mg steps every 4 or more weeks through 7.5, 10, 12.5 and 15 mg. You do not have to climb; 5, 10 and 15 mg are all approved maintenance doses. Many people hold at 5 mg or 7.5 mg as long as weight keeps moving.

How much bacteriostatic water for a 10 mg vial of Tirzepatide?

Any volume the vial holds. 10 mg in 1 mL is 10 mg/mL, in 2 mL is 5 mg/mL and in 3 mL is 3.333 mg/mL. The water changes the units per dose, not the amount of peptide.

Brands we recommend for Tirzepatide. We are independent and have no affiliation with any brand: no affiliate links, no referral codes, no paid placements. These are the suppliers whose testing and certificates hold up when we check them.