WeightSnap Tools / Retatrutide reconstitution
Enter your retatrutide vial size, how much bacteriostatic water you add, and your dose. Get the concentration, the volume to draw, and the insulin syringe units. Retatrutide vials are commonly 10mg, 12mg, or 20mg. Free, instant, nothing to install.
Common retatrutide vial and bacteriostatic water combinations, with the resulting concentration and the U-100 syringe units for reference dose points. Pure arithmetic; your protocol is between you and your provider.
| Vial + water | Concentration | 2 mg | 4 mg | 6 mg | 8 mg |
|---|---|---|---|---|---|
| 10 mg + 1 mL | 10 mg/mL | 20 | 40 | 60 | 80 |
| 10 mg + 2 mL | 5 mg/mL | 40 | 80 | 120 | 160 |
| 12 mg + 2 mL | 6 mg/mL | 33.3 | 66.7 | 100 | 133.3 |
| 20 mg + 2 mL | 10 mg/mL | 20 | 40 | 60 | 80 |
Units = (dose ÷ concentration) × 100. A U-100 syringe holds 100 units (1 mL); anything over 100 units will not fit in one syringe.
Reconstitution is one division and one multiplication. The water you add sets the concentration, and the concentration turns your dose into a syringe reading.
Worked example: a 10mg retatrutide vial with 2mL of bacteriostatic water gives 5 mg/mL. A 4mg dose is 4 ÷ 5 = 0.8 mL, which reads 80 units on a U-100 syringe. The same vial with 1mL of water would be 10 mg/mL, so that dose would read 40 units.
Any amount works mathematically; it only sets the concentration. Adding 1mL to a 10mg vial gives 10 mg/mL, and 2mL gives 5 mg/mL. People often pick a volume that makes their dose land on a round syringe number. Enter your numbers above to see the units for each option. Your dose itself is between you and your provider.
Divide your dose in mg by the concentration in mg/mL to get the volume in mL, then multiply by 100 for U-100 units. Example: 4mg at 5 mg/mL is 0.8 mL, or 80 units. The calculator does this for you.
Retatrutide is sold as a lyophilised powder in vials commonly labeled 10mg, 12mg, or 20mg. A frequent choice is 10mg plus 1 to 2mL of bacteriostatic water. The chart above shows the resulting concentration and units for several combinations.
No. Retatrutide is an investigational triple agonist in Phase 3 trials (the TRIUMPH program) and is not FDA approved. This tool is arithmetic for educational purposes and is not medical advice.
No. It converts vial size, water, and dose into concentration, volume, and units. It does not recommend a dose, schedule, or product. Always confirm anything affecting your health with your pharmacist or provider.
WeightSnap is a tracking tool, not medical advice. This calculator performs arithmetic on the numbers you enter and makes no recommendations. Always work with your healthcare provider.
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