Step 03 / Calculate
Calculate a dose
Pick a compound. We'll show the reconstitution math, syringe draw, cost per dose, and how long a vial lasts.
Using Retatrutide. To switch, type a different name above and pick it from the list. Only injectable compounds are listed; oral, nasal and topical compounds don't need mixing.
Printed on the vial.
Commonly referenced range: 1 up to 12 mg per dose (start low, increase slowly)Trial dose
iPeptide Decoding does not recommend a dose. Enter the amount your clinician gave you, or pick a value from the reference range to model.
Same dose, different draw. Pick whichever is easiest to measure.
Measuring the water1 mL = one full 100-unit syringe.
YOUR DRAW20 / 100 units
Multi-vendor comparison is a Pro feature.
Daily is 7. Twice weekly is 2.
Decoded
Your plan for Retatrutide
Dose
1 mg
Syringe draw
20units
Concentration
5mg/mL
Doses per vial
10
Cost per dose
$5.90
Monthly cost
$25.64
Current supply lasts
2.3months
Reorder by
Dec 7, 2026
Want the dose people cite instead of the math? See the dosage chart.
This is one of four tools on the site. See all tools.
Common questions
What does this calculator do?
It turns three numbers you enter, the milligrams in the vial, the water you add, and the dose you want, into the concentration, the syringe draw in units, and the cost per dose. It does arithmetic. It does not recommend a dose.
Worked example?
A 5 mg vial with 2 mL of water is 2.5 mg per mL. A 250 mcg dose is 0.1 mL, which is 10 units on a 100-unit insulin syringe.
Does adding more water give me more drug?
No. The vial holds a fixed amount. More water spreads it thinner, so the same dose is a larger draw on the syringe.
What syringe does it assume?
A U-100 insulin syringe, where 100 units is 1 mL. If your syringe is different, use the mL figure instead of the units figure.
Where does the "reference range" come from?
From the drug label, a published trial, or community practice, and it is labelled with which. It is the range a source used, not a recommendation. Talk to a licensed clinician before using any substance.