Pick a tirzepatide vial, choose the water volume and read the concentration and syringe units. Arithmetic only, the amount is yours to enter.
Results
0 to 100 units
Fill in the three fields on the left to calculate.
Bacteriostatic water, 10ml →Understanding units
The calculator tells you how many units to draw. Here is exactly what a unit is, and why it means the same thing on every insulin syringe.
On a U-100 insulin syringe one unit is a hundredth of a millilitre. So 10 units is 0.1 mL, and 100 units is 1 mL. Units simply make very small volumes easier to read off the barrel.
It does not matter which insulin syringe you pick up. Drawing to 20 units pulls the same 0.2 mL on a 0.3 mL, a 0.5 mL or a 1 mL syringe. The tick marks never change size.
What changes between syringes is how many of those marks fit on the barrel. A bigger syringe is not a bigger unit, it is just more room.
Example: a 20-unit draw is 0.2 mL on all three syringes above. The only difference is how much empty barrel is left behind it.
The full guide
The tirzepatide calculator guide
How the tirzepatide calculator works
Tirzepatide is a dual GIP and GLP-1 receptor agonist, and for research it ships as a lyophilized powder that has to be dissolved before it can be drawn. This tirzepatide reconstitution calculator takes the vial strength and the volume of bacteriostatic water you add, then returns the concentration and the syringe reading. It opens on a 10mg vial with 2mL of water, with presets for the 15mg and 30mg vials as well. The amount field starts empty on purpose. What goes in it is decided by the protocol, not by this page.
Tirzepatide reconstitution: picking a water volume that divides cleanly
Tirzepatide vials come in awkward sizes, and 15mg is the awkward one. Fifteen does not divide neatly into most water volumes, so it helps to choose a volume that gives a round concentration. A concentration in mg/mL multiplied by 10 gives the micrograms in each syringe unit:
- 10mg vial in 2mL gives 5mg/mL, which is 50mcg per unit
- 15mg vial in 3mL gives 5mg/mL, which is 50mcg per unit
- 15mg vial in 2mL gives 7.5mg/mL, which is 75mcg per unit
- 30mg vial in 3mL gives 10mg/mL, which is 100mcg per unit
Round numbers are easier to read off the barrel and easier to double-check. If the water volume you pick produces an untidy figure, nothing is wrong, but the calculator will still handle it.
Tirzepatide dosage calculator: milligrams to units
Take the amount you are working to and divide it by the concentration to get the volume in mL. Multiply by 100 for units. On the 15mg vial in 3mL, 1mg is 0.2mL, so it reads 20 units. The doses-in-vial figure divides the vial by the amount, and for that 15mg vial and 1mg that is fifteen draws. Switch the unit to mcg if your figures are in micrograms.
Confirm the vial, then keep notes
Every figure starts from the strength printed on the vial, so confirm it against the certificate of analysis for your batch. Healio publishes each one on the research page, and how to read a certificate of analysis explains which figures actually prove something. Once the vial is mixed, write the water volume, the concentration and the date on the label. Our guide to reconstituting peptides covers the handling, and how long bacteriostatic water lasts covers the in-use window.
If you are comparing molecules, is tirzepatide a peptide explains what it actually is. Tirzepatide for sale from Healio is stocked in 10mg, 15mg and 30mg vials. The same arithmetic applies to the semaglutide calculator, and the all-peptide calculator covers everything else.
Tirzepatide calculator FAQ
How much bacteriostatic water goes in a 10mg tirzepatide vial?
It is a choice, not a fixed answer. 1mL gives 10mg/mL, 2mL gives 5mg/mL and 3mL gives 3.33mg/mL. The volume sets the concentration, and the concentration decides where an amount lands on the syringe scale.
How many units is 1mg of tirzepatide?
It depends on the concentration. At 5mg/mL, 1mg is 0.2mL, which is 20 units on a U-100 syringe. At 10mg/mL the same 1mg is 10 units. The calculator shows the reading for whatever vial and water volume you enter.
Why is the 15mg vial harder to work with?
Fifteen does not divide into most water volumes. Using 3mL gives a clean 5mg/mL, and 1.5mL gives 10mg/mL. Other volumes still work and the calculator handles them, the figures are just less round.
Is the tirzepatide calculator different from the semaglutide one?
No. The arithmetic is identical and only the vial strengths differ. Use the semaglutide calculator to open on a 5mg vial instead.
Does the calculator recommend how much tirzepatide to use?
No. It converts the figures you type in and makes no recommendation. Healio supplies research compounds for laboratory use, so quantities belong to the protocol a researcher is working to.
How long does reconstituted tirzepatide last?
Reconstituted peptides are normally kept refrigerated, and bacteriostatic water is generally treated as good for 28 days after the first puncture. Our guide on how long bacteriostatic water lasts explains the rule.
Healio Peptides supplies research compounds intended for laboratory and research use only. This calculator performs concentration arithmetic on figures you enter. It does not recommend quantities, and nothing on this page is medical advice. These compounds are not intended for human consumption and these statements have not been evaluated by the FDA.