How much bacteriostatic water do I add to a 30 mg tirzepatide vial?

3 mL is the common choice and gives 10 mg/mL, so 2.5 mg is 25 units and 10 mg is 100 units. If you are running 12.5 or 15 mg, 2 mL keeps those doses inside one syringe.

How many units is 5 mg of tirzepatide?

At 10 mg/mL (30 mg in 3 mL), 50 units. At 5 mg/mL (10 mg in 2 mL), 100 units. At 15 mg/mL (30 mg in 2 mL), 33.3 units. The vial and the water decide it, not the dose alone.

Can I use the chart for a pen?

No. Pens are a fixed concentration set by the manufacturer and are dosed by the pen's own dial. This chart is for lyophilised vials you reconstitute yourself.

Tirzepatide reconstitution chart

Six vial sizes, four water volumes, the concentration of each combination and the units for every rung of the 2.5 to 15 mg ladder.

Reviewed 3 September 2026
27 compounds
Formula on every page
No ads, no vendor links

Tirzepatide vials come in 5, 10, 15, 20, 30 and 60 mg. The water you add sets the concentration, and the concentration sets how many units each rung of the 2.5 to 15 mg ladder needs. This chart gives every combination so you can pick a water volume that keeps your dose readable and inside one syringe.

Concentration for every vial and water volume

Vial	1 mL	2 mL	3 mL	4 mL
5 mg	5 mg/mL	2.5 mg/mL	1.67 mg/mL	1.25 mg/mL
10 mg	10 mg/mL	5 mg/mL	3.33 mg/mL	2.5 mg/mL
15 mg	15 mg/mL	7.5 mg/mL	5 mg/mL	3.75 mg/mL
20 mg	20 mg/mL	10 mg/mL	6.67 mg/mL	5 mg/mL
30 mg	30 mg/mL	15 mg/mL	10 mg/mL	7.5 mg/mL
60 mg	60 mg/mL	30 mg/mL	20 mg/mL	15 mg/mL

The ladder in units, by vial and water

Bold rows fit a 1 mL syringe across the whole ladder. Where a dose exceeds 100 units you need less water or a second injection.

5 mg vial

Water	Conc.	2.5 mg	5 mg	7.5 mg	10 mg	12.5 mg	15 mg
1 mL	5 mg/mL	50	100	-	-	-	-
2 mL	2.5 mg/mL	100	200*	-	-	-	-
3 mL	1.67 mg/mL	150*	300*	-	-	-	-
4 mL	1.25 mg/mL	200*	400*	-	-	-	-

10 mg vial

Water	Conc.	2.5 mg	5 mg	7.5 mg	10 mg	12.5 mg	15 mg
1 mL	10 mg/mL	25	50	75	100	-	-
2 mL	5 mg/mL	50	100	150*	200*	-	-
3 mL	3.33 mg/mL	75	150*	225*	300*	-	-
4 mL	2.5 mg/mL	100	200*	300*	400*	-	-

15 mg vial

Water	Conc.	2.5 mg	5 mg	7.5 mg	10 mg	12.5 mg	15 mg
1 mL	15 mg/mL	16.7	33.3	50	66.7	83.3	100
2 mL	7.5 mg/mL	33.3	66.7	100	133.3*	166.7*	200*
3 mL	5 mg/mL	50	100	150*	200*	250*	300*
4 mL	3.75 mg/mL	66.7	133.3*	200*	266.7*	333.3*	400*

20 mg vial

Water	Conc.	2.5 mg	5 mg	7.5 mg	10 mg	12.5 mg	15 mg
1 mL	20 mg/mL	12.5	25	37.5	50	62.5	75
2 mL	10 mg/mL	25	50	75	100	125*	150*
3 mL	6.67 mg/mL	37.5	75	112.5*	150*	187.5*	225*
4 mL	5 mg/mL	50	100	150*	200*	250*	300*

30 mg vial

Water	Conc.	2.5 mg	5 mg	7.5 mg	10 mg	12.5 mg	15 mg
1 mL	30 mg/mL	8.3	16.7	25	33.3	41.7	50
2 mL	15 mg/mL	16.7	33.3	50	66.7	83.3	100
3 mL	10 mg/mL	25	50	75	100	125*	150*
4 mL	7.5 mg/mL	33.3	66.7	100	133.3*	166.7*	200*

60 mg vial

Water	Conc.	2.5 mg	5 mg	7.5 mg	10 mg	12.5 mg	15 mg
1 mL	60 mg/mL	4.2	8.3	12.5	16.7	20.8	25
2 mL	30 mg/mL	8.3	16.7	25	33.3	41.7	50
3 mL	20 mg/mL	12.5	25	37.5	50	62.5	75
4 mL	15 mg/mL	16.7	33.3	50	66.7	83.3	100

Units on a standard U-100 insulin syringe. * means more than 100 units, so more than one 1 mL syringe. A dash means the dose is larger than the vial.

Reading the chart

A 30 mg vial with 3 mL is the setup most people land on: 10 mg/mL, so the ladder runs 25, 50, 75, 100, 125 and 150 units. Fine up to 10 mg, then it outgrows the syringe. Reconstituting the same vial with 2 mL (15 mg/mL) brings 15 mg down to 100 units. A 5 mg vial is two 2.5 mg starting doses and nothing else, whatever the water. Write the water volume on the vial; the chart is useless a week later if you cannot remember which row you are on.

Tirzepatide dosage chart: the 2.5 to 15 mg titration ladder converted to insulin syringe units — Tirzepatide dosage chart. Save or print this one, or download the full-size image. Open the live calculator to use your own numbers.

Live version: the tirzepatide dosage calculator. The titration schedule page runs the whole ladder with a vial count.

Peptide calculator by Peptulator Free, no signup. Research use only, not medical advice.

Free downloadThe Protocol Pack

25 printable pages: dosing cards for the twelve most-used compounds at three water volumes, titration planners, a vial log, and five pages on what to do when it has already gone wrong.

Common questions

How much bacteriostatic water do I add to a 30 mg tirzepatide vial?: 3 mL is the common choice and gives 10 mg/mL, so 2.5 mg is 25 units and 10 mg is 100 units. If you are running 12.5 or 15 mg, 2 mL keeps those doses inside one syringe.
How many units is 5 mg of tirzepatide?: At 10 mg/mL (30 mg in 3 mL), 50 units. At 5 mg/mL (10 mg in 2 mL), 100 units. At 15 mg/mL (30 mg in 2 mL), 33.3 units. The vial and the water decide it, not the dose alone.
Can I use the chart for a pen?: No. Pens are a fixed concentration set by the manufacturer and are dosed by the pen's own dial. This chart is for lyophilised vials you reconstitute yourself.

MethodologyEvery formula and rounding rule, so you can check the maths Read a syringeU-100 vs U-40, and the 2.5x error Build a full protocolThe stack builder at Peptide Bureau, about two minutes

Related calculators and charts

Dosage charts and schedules

Peptide reconstitution chart Concentration for every vial and water combination
Peptide dosing chart Printable unit tables for every compound
Retatrutide titration schedule 2 to 12 mg in units, stage by stage
Tirzepatide titration schedule 2.5 to 15 mg in units, stage by stage
Semaglutide titration schedule 0.25 to 2.4 mg in units, stage by stage
KLOW dosage and frequency chart The 80 mg blend at 2, 3 and 4 mL, both phases
GLOW dosage chart The 70 mg blend, units to each peptide
Wolverine stack dosing chart BPC-157 + TB-500, blend and separate vials
MOTS-c dosage chart 5 and 10 mg vials at three water volumes
Tirzepatide reconstitution chart (this page)
Tirzepatide units to mg chart Both directions, every vial and water volume
Semaglutide units to mg chart The dosage chart in units, both directions
NAD+ injection dosage chart Per day, per week and frequency, 100 to 1,000 mg vials
Tesamorelin dosage chart 2, 5 and 10 mg vials, 0.5 to 2 mg in units
BPC-157 dosage chart mcg doses from 5 and 10 mg vials, four water volumes
PT-141 dosage chart The 10 mg vial, 0.5 to 2 mg, with uses per vial
Sermorelin dosage chart Nightly mcg doses from 5, 10 and 15 mg vials
Printable dosing charts Four one-page charts to save, pin or print
Peptide storage chart How long powder and mixed vials last, fridge to freezer

Every one of the 27 compound calculators, charts and tools: the full list.

Before you use these numbers This is a unit-conversion tool. It turns a vial strength and a water volume into a concentration, a draw volume and a syringe mark. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most compounds listed are sold for laboratory research and are not approved for human use. Nothing here is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always check the strength printed on your own vial rather than trusting a preset.