Quick math example
A 10 mg vial mixed with 2 mL gives 5 mg/mL. A 2 mg dose is 0.4 mL, which equals 40 units on a U-100 syringe.
How the retatrutide calculation works
Retatrutide doses are typically discussed in milligrams while many vials and syringes require thinking in mg, mcg, mL, and units at the same time. The calculator handles all four conversions for you.
Concentration is solved first, then your target dose is divided by that concentration to return the draw volume and matching syringe units.
- 10 mg equals 10,000 mcg
- 10,000 mcg / 2 mL = 5,000 mcg per mL
- 2,000 mcg / 5,000 mcg per mL = 0.4 mL
Re-check the math when anything changes
Recalculate whenever vial size, BAC water amount, target dose, syringe type, or syringe capacity changes. Saving the setup in PepSync prevents re-entering the same details every cycle.
Sources used
Frequently asked questions
Does this calculator tell me what retatrutide dose to take?+
No. It converts a dose you already have into mL and syringe units. Dosing decisions should come from a licensed clinician or pharmacy instructions.
Why does the draw volume change when I switch syringes?+
Insulin syringe units are based on concentration markings. U-100 has 100 units per mL, so a 0.4 mL draw is 40 units; on a different scale the unit count changes.
Is retatrutide available as a commercial product?+
Availability varies by jurisdiction and time. This page only covers the calculator math; for status and access, check current regulatory guidance.