Vial size
5 mg
BAC water
1.0 mL
Concentration
5 mg/mL
Units per 1 mg
20 units
Peptide Tools
Reconstitution + Units
Tirzepatide Reconstitution & Dosage Calculator
This free calculator turns vial size, BAC water, and target dose into concentration, draw volume, and U-100 syringe units. It is an educational research-planning tool, not medical advice, and it does not tell you what dose to use.
Quick summary
- Converts vial size (mg), BAC water (mL), and target dose (mg) into concentration, draw volume, and U-100 syringe units.
- Works for any common research vial size: 5, 10, 15, 20, 30, 40, and 60 mg.
- Educational research-planning tool only. It does not diagnose, treat, or recommend a dose.
- Compound
- Tirzepatide (GIP/GLP-1 agonist)
- Tool type
- Reconstitution and unit calculator
- Common research vials
- 10, 15, 20, 30, 40, 60 mg
- Most common mix
- 30 mg + 3 mL = 10 mg/mL
- Regulatory status
- Research-use compounded vials not FDA-approved
Tirzepatide reconstitution calculator
Tirzepatide presets
Use the presets first; the manual steps below are for different vial sizes, water volumes, or doses.
3 mL max presets
30 mg + 3 mL = 10 mg/mL, so 10 units = 1 mg.
Optional: use when your setup does not match a preset
Step 1
Syringe
U-100
Choose syringe size.
Step 2
Vial quantity
How many mg of peptides in your vial?
mg
Step 3
Dose
Dose amount per injection. 1 mg = 1000 mcg.
mg
Step 4
BAC water
Bacteriostatic water used to reconstitute your vial.
mL
Your draw
1.0 mL
25units
0102030405060708090100
To have a dose of 2.5 mg, pull to 25 units.
Vial
30 mg
Water
3 mL
Volume
0.250 mL
Save this draw so you do not need to redo the math next time.
Tirz shopping
Copy the discount code, then use at checkout.
Verified USA Suppliers
Verified EU Supplier
What this tirzepatide calculator does
This calculator does one job. It turns your vial size, the amount of BAC water you add, and your target dose into three numbers: concentration in mg/mL, the volume you draw in mL, and the matching units on a U-100 insulin syringe.
Tirzepatide ships as a freeze-dried powder. Before it can be drawn into a syringe, it has to be mixed with bacteriostatic (BAC) water. The amount of water you add sets the concentration, and the concentration is what decides how many units you draw. Get the concentration right and the units fall into place.
Research-use only - not medical advice
This page and calculator are educational research-planning tools. They do not recommend a dose, diagnose, or treat anything. Compounded and research-use tirzepatide is not FDA-approved. Talk to a qualified clinician before using any peptide.
How to use the tirzepatide calculator
The easiest path is to use the tirzepatide preset dropdowns first. Pick the vial setup that matches your research vial, then pick the common dose you want to calculate. The custom steps are only there when your vial size, BAC water volume, or target dose does not match a preset.
- 1
Start with a tirzepatide vial preset
Use the common vial setup dropdown first. It includes common tirzepatide setups for 5, 10, 15, 20, 30, 40, and 60 mg vials, with BAC water capped at 3 mL.
- 2
Pick the tirzepatide dose
Use the common dose dropdown next. The calculator fills the dose field for you without choosing or recommending a dose.
- 3
Use custom only if needed
If your tirzepatide vial, BAC water amount, or target dose is different, use the manual fields below the preset divider. Enter the vial mg, BAC water mL, and dose yourself.
- 4
Read the tirzepatide draw
The calculator shows concentration in mg/mL, draw volume in mL, and matching U-100 syringe units. If the draw is more than 1 mL, it will not fit one syringe, so use a stronger mix for that research setup.
- 5
Save the tirzepatide calculation
Use Save calculation to email yourself the draw, vial, water, dose, and supplier links so you can reference the setup later.
Tirzepatide reconstitution math, explained
The math is short. Concentration is vial size divided by BAC water. Draw volume is target dose divided by concentration. U-100 units are milliliters multiplied by 100.
Here is one example. A 30 mg vial with 3 mL of BAC water gives 10 mg/mL. A 2.5 mg dose is 2.5 divided by 10, which is 0.25 mL, or 25 units. Add only 1.5 mL to that same vial and you get 20 mg/mL, so the same 2.5 mg dose becomes 0.125 mL, or about 13 units. Same peptide, different volume.
Concentration and units per 1 mg by vial size and BAC water
Vial size
10 mg
BAC water
1.0 mL
Concentration
10 mg/mL
Units per 1 mg
10 units
Vial size
10 mg
BAC water
2.0 mL
Concentration
5 mg/mL
Units per 1 mg
20 units
Vial size
15 mg
BAC water
1.5 mL
Concentration
10 mg/mL
Units per 1 mg
10 units
Vial size
20 mg
BAC water
2.0 mL
Concentration
10 mg/mL
Units per 1 mg
10 units
Vial size
30 mg
BAC water
3.0 mL
Concentration
10 mg/mL
Units per 1 mg
10 units (most common)
Vial size
30 mg
BAC water
1.5 mL
Concentration
20 mg/mL
Units per 1 mg
5 units
Vial size
40 mg
BAC water
2.0 mL
Concentration
20 mg/mL
Units per 1 mg
5 units
Vial size
60 mg
BAC water
3.0 mL
Concentration
20 mg/mL
Units per 1 mg
5 units
A 10 mg/mL mix is the easy one: 10 units equals 1 mg. A 20 mg/mL mix is stronger, so each unit carries more peptide and your draw volume stays small for larger doses.
Tirzepatide dose-to-units reference
The FDA-approved labels for Zepbound and Mounjaro list once-weekly doses that step up over time: 2.5, 5, 7.5, 10, 12.5, and 15 mg, with the label moving up about every four weeks and 15 mg as the maximum. We list these numbers because people search for them. This is label reporting, not a dose recommendation, and this calculator does not tell you which dose to use.
Below is how those same mg values convert to U-100 syringe units at the two most common research concentrations. Use it as a sanity check against the calculator.
Units to draw at 10 mg/mL (e.g. 30 mg vial + 3 mL)
Dose (mg)
2.5 mg
Volume (mL)
0.25 mL
U-100 units
25 units
Dose (mg)
5 mg
Volume (mL)
0.50 mL
U-100 units
50 units
Dose (mg)
7.5 mg
Volume (mL)
0.75 mL
U-100 units
75 units
Dose (mg)
10 mg
Volume (mL)
1.00 mL
U-100 units
100 units (full 1 mL syringe)
Dose (mg)
12.5 mg
Volume (mL)
1.25 mL
U-100 units
125 units (over 1 mL - use 20 mg/mL)
Dose (mg)
15 mg
Volume (mL)
1.50 mL
U-100 units
150 units (over 1 mL - use 20 mg/mL)
At 10 mg/mL, doses of 12.5 mg and higher do not fit one 1 mL syringe. Mix stronger to keep each draw under 1 mL.
Units to draw at 20 mg/mL (e.g. 60 mg vial + 3 mL)
Dose (mg)
2.5 mg
Volume (mL)
0.125 mL
U-100 units
12.5 units
Dose (mg)
5 mg
Volume (mL)
0.25 mL
U-100 units
25 units
Dose (mg)
7.5 mg
Volume (mL)
0.375 mL
U-100 units
37.5 units
Dose (mg)
10 mg
Volume (mL)
0.50 mL
U-100 units
50 units
Dose (mg)
12.5 mg
Volume (mL)
0.625 mL
U-100 units
62.5 units
Dose (mg)
15 mg
Volume (mL)
0.75 mL
U-100 units
75 units
A 20 mg/mL mix keeps every listed dose well under 1 mL, but the units land on half marks, so a 0.3 mL (30-unit) syringe with finer lines is easier to read.
Tirzepatide supplies
Use this as a simple shopping checklist for reconstitution. Confirm vial size, batch documents, and current pricing before ordering. This is not dose advice.
Recommended Supply
PEPPAL applies to eligible supplier checkout links when supported by the supplier.
Why choose Peptide Partners?Verified Supplier LinkVerified Supplier Link
Tirzepatide Supply
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Disclosure: supply links may earn PepPal a commission at no cost to you.
Frequently Asked Questions
What does this tirzepatide calculator tell me?
It converts vial size, BAC water, and target dose into concentration (mg/mL), draw volume (mL), and U-100 syringe units. It does not tell you what dose to use.
Is this tirzepatide reconstitution calculator free?
Yes. It runs in your browser at no cost and does not require an account.
How much BAC water do I add to a tirzepatide vial?
It depends on the concentration you want. A 30 mg vial with 3 mL of BAC water makes 10 mg/mL, which is the most common community mix. Less water makes a stronger solution. Enter your vial size and water amount and the calculator shows the result.
How many units is 2.5 mg of tirzepatide?
At 10 mg/mL it is 25 units (0.25 mL). At 20 mg/mL it is about 13 units (0.125 mL). Units always depend on your concentration, so check your own mix in the calculator.
How do I use it for a 60 mg or 30 mg vial?
Pick the vial size, then enter your BAC water. A 60 mg vial with 3 mL gives 20 mg/mL. A 30 mg vial with 3 mL gives 10 mg/mL. The calculator handles 5, 10, 15, 20, 30, 40, and 60 mg vials.
What concentration should I mix tirzepatide to?
Many people use 10 mg/mL because 10 units equals 1 mg, which is easy math. A stronger 20 mg/mL mix keeps larger doses under one syringe. The right choice is the one that keeps your draw easy to read on your syringe.
What is the tirzepatide half-life?
Tirzepatide has a half-life of about five days, which is why it is studied as a once-weekly injection. The calculator only handles single-draw math, not blood-level modeling over time.
Is tirzepatide FDA-approved?
Branded tirzepatide is FDA-approved as Zepbound and Mounjaro. Compounded and research-use tirzepatide vials are not FDA-approved. Tirzepatide was removed from the FDA shortage list on October 2, 2024.
Can I use this for compounded tirzepatide from a pharmacy?
You can use it to double-check the math, but always read the concentration printed on your pharmacy label first and confirm it with your pharmacy or clinician before drawing any dose.
Is this medical advice?
No. This calculator is for education and research planning only. It does not diagnose, treat, or recommend a dose. Talk to a qualified clinician before using any peptide.
Preferred supplier
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Sources and research notes
- 1. Jastreboff AM, Aronne LJ, Ahmad NN, et al. Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). New England Journal of Medicine (2022)
- 2. ClinicalTrials.gov A Study of Tirzepatide (LY3298176) in Participants With Obesity or Overweight (NCT04184622). U.S. National Library of Medicine (2023)
- 3. Wadden TA, Chao AM, Machineni S, et al. Tirzepatide after intensive lifestyle intervention in adults with overweight or obesity (SURMOUNT-3). Nature Medicine (2023)
- 4. Eli Lilly and Company SURMOUNT-1 results published in NEJM: tirzepatide achieved 16.0% to 22.5% weight loss in adults with obesity or overweight. Lilly Investor News (2022)
- 5. Drugs.com editorial team (medically reviewed) Tirzepatide (Zepbound, Mounjaro): dosage forms, vial strengths, half-life, and approval status. Drugs.com (2026)