Tirzepatide calculator
Enter your tirzepatide vial size, the water you added, and a dose. PepExact returns the exact units on a U-100 insulin syringe — and shows the arithmetic behind it.
The fields below are generic example numbers, filled in so you can see the calculator work — they are not a recommended Tirzepatide dose. Clear them and enter your own vial size, water, and dose.
Your draw
10 units
on a U-100 insulin syringe · 0.1 mL
Concentration
2.5 mg/mL
2,500 mcg/mL
Volume per dose
0.1 mL
Doses in this vial
20
at 250 mcg each
Show the math
- 1. Concentration: 5 mg ÷ 2 mL = 2.5 mg/mL (2,500 mcg/mL)
- 2. Volume for one dose: 250 mcg ÷ 2,500 mcg/mL = 0.1 mL
- 3. Syringe units (U-100): 0.1 mL × 100 units/mL = 10 units
- 4. Doses in the vial: 5,000 mcg ÷ 250 mcg = 20 full doses
Continue on your phone
PepExact for iPhone keeps the same vial numbers, draws the syringe marks, and works offline — the same measurement math as here.
About this calculator
Tirzepatide is a synthetic peptide that acts on both glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors and has been studied extensively in clinical trials.
Whatever the compound, this page only does arithmetic. It turns a vial size in milligrams, the water you add in millilitres, and a dose into the number of units on a U-100 insulin syringe — and shows every step. It does not know, store, or suggest what any dose should be.
The most common measurement slip is milligrams versus micrograms: 1 mg is 1,000 mcg. Keep the unit switch on the dose field set to whatever your number is actually written in, and the arithmetic stays honest.
Primary sources
PepExact does not assess whether any compound works or is appropriate for anyone. These registries are the record for research and regulatory status.
Common questions
How do I work out tirzepatide syringe units?
Three steps of arithmetic. Concentration: vial milligrams ÷ water millilitres. Volume: your dose ÷ that concentration. Units: volume in mL × 100, because a U-100 syringe holds 100 units per mL. PepExact does all three and shows the working.
How much water do I add to a tirzepatide vial?
That is your choice, and it changes the concentration rather than the amount of peptide in the vial. More water makes each draw larger and easier to read; less water makes it smaller. The reconstitution calculator works backwards from the units you want to a water volume.
Why do two people get different units for the same tirzepatide dose?
Because units depend on concentration, which depends on how much water was added. The same dose from a vial mixed with 1 mL versus 2 mL of water lands on a different number of units. Always recalculate when the vial or water changes.
Does PepExact recommend a tirzepatide dose?
No. PepExact is a measurement tool. It converts numbers you already have into syringe units and never suggests what or how much to take.
Related tools
PepExact is a measurement tool, not medical advice. It never suggests what or how much of Tirzepatide — or anything else — to take; it only does the arithmetic on numbers you already have.