Retatrutide dosage calculator
Enter your vial strength and the amount of bacteriostatic water you added, and the calculator returns concentration, injection volume, syringe units, and how many doses remain in the vial.
Open the dosage calculatorThe formula behind it
Concentration (mg/mL) = vial strength (mg) ÷ water added (mL). Injection volume (mL) = target dose (mg) ÷ concentration. Syringe units = injection volume × 100 on a U-100 syringe.
Worked example: a 30 mg vial with 3 mL of water is 10 mg/mL. A 1.5 mg dose is 0.15 mL — 15 units.
Doses per vial
| Vial | Water | Concentration | 1 mg doses |
|---|---|---|---|
| 30 mg | 3 mL | 10 mg/mL | 30 |
| 30 mg | 1.5 mL | 20 mg/mL | 30 |
| 20 mg | 2 mL | 10 mg/mL | 20 |
| 10 mg | 1 mL | 10 mg/mL | 10 |
Note that the number of doses depends only on the vial strength — water volume changes how much you draw, never how much peptide is in the vial.
Frequently asked questions
How many units is 1 mg of Retatrutide?
At 10 mg/mL (30 mg vial reconstituted with 3 mL), 1 mg is 0.1 mL, which is 10 units on a U-100 insulin syringe.
Does adding more water reduce the strength of each dose?
It reduces the concentration, so the same dose takes a larger volume. The milligrams delivered are unchanged as long as you recalculate the volume.
Every vial ships with its own published certificate.
Purity, quantity, and endotoxin tested by Janoshik Analytical, published before the product goes on sale.
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Continue reading
How to mix Retatrutide
Reconstitution is the step where most peptide is wasted. This is the exact procedure for a 30 mg Retatrutide vial, including the arithmetic that turns milligrams into syringe units.
Peptide calculator
One calculator handles every peptide, because the arithmetic never changes — only the numbers you put into it.
Insulin syringe guide
Almost every dosing error in peptide research traces back to the syringe: units confused with millilitres, or a barrel too large to read a small dose.
All Origen products are supplied for laboratory research use only and are not for human or veterinary consumption. Nothing on this page is medical advice. Last updated 2026-08-03.