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Retatrutide dosage calculator
Retatrutide vials are commonly labelled 5 mg, 10 mg, 20 mg. This calculator divides the vial mass by the diluent volume you enter to show concentration, then converts your own target amount into millilitres and syringe units. It states no dose, chooses no amount and stores nothing.
This page is a calculation tool. The amounts you enter are values you decided; this page states no dose and gives no medical advice.
Retatrutide vial concentration grid
This table answers one arithmetic question: what concentration results when a labelled vial mass is divided by a measured diluent volume? It does not select either value.
| Vial mass | Diluent | Concentration | Same concentration |
|---|---|---|---|
| 5 mg | 0.5 mL | 10,000 mcg/mL | 10 mg/mL |
| 5 mg | 1 mL | 5,000 mcg/mL | 5 mg/mL |
| 5 mg | 1.5 mL | 3,333.33 mcg/mL | 3.333 mg/mL |
| 5 mg | 2 mL | 2,500 mcg/mL | 2.5 mg/mL |
| 5 mg | 2.5 mL | 2,000 mcg/mL | 2 mg/mL |
| 5 mg | 3 mL | 1,666.67 mcg/mL | 1.667 mg/mL |
| 5 mg | 5 mL | 1,000 mcg/mL | 1 mg/mL |
| 10 mg | 0.5 mL | 20,000 mcg/mL | 20 mg/mL |
| 10 mg | 1 mL | 10,000 mcg/mL | 10 mg/mL |
| 10 mg | 1.5 mL | 6,666.67 mcg/mL | 6.667 mg/mL |
| 10 mg | 2 mL | 5,000 mcg/mL | 5 mg/mL |
| 10 mg | 2.5 mL | 4,000 mcg/mL | 4 mg/mL |
| 10 mg | 3 mL | 3,333.33 mcg/mL | 3.333 mg/mL |
| 10 mg | 5 mL | 2,000 mcg/mL | 2 mg/mL |
| 20 mg | 0.5 mL | 40,000 mcg/mL | 40 mg/mL |
| 20 mg | 1 mL | 20,000 mcg/mL | 20 mg/mL |
| 20 mg | 1.5 mL | 13,333.33 mcg/mL | 13.333 mg/mL |
| 20 mg | 2 mL | 10,000 mcg/mL | 10 mg/mL |
| 20 mg | 2.5 mL | 8,000 mcg/mL | 8 mg/mL |
| 20 mg | 3 mL | 6,666.67 mcg/mL | 6.667 mg/mL |
| 20 mg | 5 mL | 4,000 mcg/mL | 4 mg/mL |
Retatrutide physical-property record
Retatrutide reference identity
Cayman Chemical identifies retatrutide as LY3437943 and lists formula C221H342N46O68 with molecular weight 4,731.34 g/mol. That value belongs to the structure in the supplier specification. A research vial with an added counterion or a different purity basis may not have the same gross formula mass. The complete product name, certificate and lot should therefore remain attached to any molecular-weight entry instead of relying on the short name alone. Sources: Cayman Chemical: retatrutide specification.
Solubility and storage for the catalog material
The Cayman technical page reports water solubility at 25 mg/mL and storage at -20 C for its retatrutide reference material. These are laboratory handling facts for that product, not a selected concentration or reconstitution instruction. The calculator deliberately ignores the supplier's solubility number when setting inputs. It divides the labelled mass by the liquid volume actually entered by the user. Sources: Cayman Chemical: retatrutide specification.
Published trial material is not a retail vial specification
The phase 2 publication identifies the investigational compound and trial context, but it does not authenticate products sold outside that study. A study record, a chemical reference standard and a commercial research vial are different physical objects. The study citation can support the compound name and investigational status; the supplier technical sheet supports the reference material's formula and handling. Neither source proves the contents of an unrelated vial. Sources: New England Journal of Medicine: retatrutide phase 2 trial · Cayman Chemical: retatrutide specification.
A narrow arithmetic role
For retatrutide, this page records mass, measured liquid and unit conversion without converting a trial result into an amount recommendation. Molecular weight is an identity aid, while water solubility is a supplier observation. Neither value selects the user's target field. Keeping those physical facts visibly sourced allows the calculator to remain an auditable concentration tool while stating no dose, schedule, progression or clinical equivalence. Sources: Cayman Chemical: retatrutide specification · New England Journal of Medicine: retatrutide phase 2 trial.
How to use the calculator
- Read the total mass from your own vial label and enter it in milligrams.
- Enter the diluent volume you actually measured, not an intended or remembered value.
- Enter your own target amount and select the calibration printed on your syringe barrel.
- Record the concentration with the result so the syringe-unit figure remains interpretable later.
Source and identity record
Use the compound reference page and these external database searches when checking identity: PubMed literature search for Retatrutide · PubChem compound database · Cayman Chemical: retatrutide specification · New England Journal of Medicine: retatrutide phase 2 trial. A database record does not authenticate a vial.
Frequently asked questions
How much bacteriostatic water for a 5 mg Retatrutide vial?
This calculator does not choose a diluent volume. Enter the volume you decided to add to the 5 mg vial and it will show the resulting concentration. The page supplies arithmetic, not an instruction.
How much bacteriostatic water for a 20 mg Retatrutide vial?
There is no universal volume selected by this page. Use the value you measured or were instructed to use; the calculator then divides the 20 mg label mass by that volume.
Does the Retatrutide calculator recommend a dose?
No. The target amount is always entered by the user. The tool provides no starting amount, maximum amount, progression, frequency or schedule.
Why does the syringe calibration matter?
A syringe unit is a volume marking. U-100, U-50 and U-40 barrels use different numbers of units per millilitre, so the same solution volume produces different markings.
Related pages
Stop recalculating this every time
PepCycle stores each vial once — mass, diluent volume, concentration — and converts automatically for every entry after that, in both directions, including entries you backdate.
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Last updated · Written by Aykut Yilmaz. All calculations run in your browser; no values are transmitted or stored.