Retatrutide dosage calculator
Retatrutide vials are usually 5–20 mg of powder. Enter the vial size, how much bacteriostatic water you added and the dose you want — the calculator gives the exact insulin-syringe mark, how many doses the vial holds and the cost per dose.
Vial size
Common doses
Draw to this mark
40
units on a U-100 insulin syringe (0.4 mL)
- Concentration
- 5 mg/mL
- 5000 mcg/mL
- Doses per vial
- 5
- 2 mg each
- Cost per dose
- —
- add a vial cost
Retatrutide reconstitution chart (10 mg vial)
| Water added | Concentration | 1 mg | 2 mg | 4 mg |
|---|---|---|---|---|
| 1 mL | 10 mg/mL | 10 units | 20 units | 40 units |
| 2 mL | 5 mg/mL | 20 units | 40 units | 80 units |
| 3 mL | 3.333 mg/mL | 30 units | 60 units | 120 units |
Units are marks on a U-100 insulin syringe (1 mL = 100 units).
Retatrutide calculator FAQ
- How much bacteriostatic water for a 10 mg retatrutide vial?
- 2 mL is the most common choice: it gives 5 mg/mL, so a 2 mg dose is 0.4 mL, or the 40-unit mark on a U-100 insulin syringe. 1 mL gives 10 mg/mL and halves every draw; 3 mL gives 3.33 mg/mL and makes small doses easier to measure precisely.
- How many doses are in a 10 mg retatrutide vial?
- Divide the vial by your dose: 10 mg at 2 mg per week is 5 doses, at 4 mg it is 2 full doses plus a remainder. The calculator shows this as you type.
- Does the amount of water change the strength of the dose?
- No. More water only makes the solution more dilute, so you draw a larger volume for the same milligrams. The amount of peptide you inject is what you set as the dose.
- How do you calculate a peptide dose after reconstitution?
- Divide the peptide in the vial (mg) by the bacteriostatic water you added (mL) to get mg/mL. Then divide your dose by that concentration to get the volume to draw, and multiply by 100 for the mark on a U-100 insulin syringe.
- Does this calculator give medical advice?
- No. It is arithmetic only. It does not suggest, endorse or recommend any compound or dose. Talk to a licensed clinician before using any peptide.
Keep the numbers instead of redoing them
Pepprep saves your Retatrutide vials, tracks how much is left as you log doses and shows cost per dose over time — free, and it syncs across your devices.
Other peptide calculators
Pepprep is a tracking and arithmetic tool. It does not prescribe, diagnose or recommend any compound or dose. See the medical disclaimer.