12.5 mg Tirzepatide in Units: Syringe Chart

How many syringe units 12.5 mg of Tirzepatide is, for every common vial size and water volume, with the math shown.

Medically reviewed by Juan Pablo Frías, MD · 3 Oct 2026 · DisclosureGLP-1 / GIP dual agonistUpdated 3 Oct 2026

Amount: 12.5 mg
At 5 mg/mL: 250 units; e.g. 10 mg vial + 2 mL
At 10 mg/mL: 125 units; e.g. 20 mg vial + 2 mL
Syringe: U-100; 100 units = 1 mL

12.5 mg in units at common mixes

Units on a U-100 syringe (100 units = 1 mL) for a 12.5 mg amount, by vial size and water added. Concentration = vial mg ÷ mL of water; units = dose ÷ concentration × 100.

12.5 mg of Tirzepatide in syringe units
Vial	Water	Concentration	Units for 12.5 mg	Volume
15 mg	1 mL	15 mg/mL	83.3 u	0.83 mL
15 mg	2 mL	7.5 mg/mL	166.7 u (over 1 mL)	1.67 mL
15 mg	3 mL	5 mg/mL	250 u (over 1 mL)	2.50 mL
20 mg	1 mL	20 mg/mL	62.5 u	0.63 mL
20 mg	2 mL	10 mg/mL	125 u (over 1 mL)	1.25 mL
20 mg	3 mL	6.667 mg/mL	187.5 u (over 1 mL)	1.88 mL
30 mg	1 mL	30 mg/mL	41.7 u	0.42 mL
30 mg	2 mL	15 mg/mL	83.3 u	0.83 mL
30 mg	3 mL	10 mg/mL	125 u (over 1 mL)	1.25 mL
40 mg	1 mL	40 mg/mL	31.3 u	0.31 mL
40 mg	2 mL	20 mg/mL	62.5 u	0.63 mL
40 mg	3 mL	13.333 mg/mL	93.8 u	0.94 mL
50 mg	1 mL	50 mg/mL	25 u	0.25 mL
50 mg	2 mL	25 mg/mL	50 u	0.50 mL
50 mg	3 mL	16.667 mg/mL	75 u	0.75 mL
60 mg	1 mL	60 mg/mL	20.8 u	0.21 mL
60 mg	2 mL	30 mg/mL	41.7 u	0.42 mL
60 mg	3 mL	20 mg/mL	62.5 u	0.63 mL

Calculator and full dosing table

Preset to 12.5 mg in a 15 mg vial. Change any value; the table below the result updates with it.

1Vial size

2Bacteriostatic water added

3Dose per injection

4Syringe (U-100)

Draw to

166.67units

= 1.67 mL on a 1 mL U-100 insulin syringe

This dose is more than the syringe holds. Choose a larger syringe or add less water.

15 mg vial2 mL water12.5 mg dose

Concentration: 7.5 mg/mL
Doses per vial: 1
Weeks (1 dose/wk): 1

Math only. It does not recommend a dose.

Dosing table for a 15 mg vial

Syringe units (U-100) for each dose, by how much bacteriostatic water you add.

Tirzepatide: U-100 syringe units per dose for a 15 mg vial
Dose	1 mL water	2 mL water	2.5 mL water	3 mL water
1 mg	6.67	13.33	16.67	20
2.5 mg	16.67	33.33	41.67	50
5 mg	33.33	66.67	83.33	100
7.5 mg	50	100	125	150
10 mg	66.67	133.33	166.67	200
12.5 mg	83.33	166.67	208.33	250
15 mg	100	200	250	300

How the math works

Concentration is the vial's milligrams divided by the water you add. Volume to draw is your dose divided by that concentration. On a U-100 syringe, 1 mL is 100 units, so units = mL × 100.

15 mg ÷ 2 mL = 7.5 mg/mL
12.5 mg ÷ 7.5 mg/mL = 1.67 mL
1.67 mL × 100 = 166.67 units

166.67 units · 1.67 mL · 12.5 mg from 15 mg + 2 mL

Math only. The amounts in these tables are reference values for the arithmetic, not dose recommendations.

Common questions

How many units is 12.5 mg of Tirzepatide?

It depends on the concentration. With a 10 mg vial and 2 mL of water (5 mg/mL), 12.5 mg is 250 units on a U-100 syringe. The table shows other mixes.

Is 12.5 mg a recommended dose of Tirzepatide?

This page is math only. It converts an amount into syringe units and does not recommend a dose. See the dosage page for what studies used.

More on Tirzepatide

DosageDoses used in published studies, with the source for each.CalculatorVial, water and dose to syringe units.Side effectsWhat labels and studies report, and what is unknown.ResultsStudy outcomes and when they were measured.PricePrice per mg and per week from dated listings. No vendor links.Legal statusFDA, compounding and WADA status with dates.

Sources

1Metric (SI) Prefixes (NIST Reference on Constants, Units, and Uncertainty)National Institute of Standards and Technology (NIST) · 2025physics.nist.govAccessed 2 Oct 2026
2BASAGLAR (insulin glargine) injection, prescribing information (DailyMed)U.S. Food and Drug Administration / DailyMed (Eli Lilly and Company label) · 2026dailymed.nlm.nih.govAccessed 2 Oct 2026

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