Retatrutide Calculator
Retatrutide calculator: enter your vial size, the water you added and your dose to see exactly how many units to draw on a U-100 syringe, with the math shown.
- Concentration
- 5 mg/mL
- Doses per vial
- 5
How the math works
Three steps turn a vial into a syringe reading.
- Concentration = vial milligrams divided by millilitres of water. A 10 mg vial with 2 mL is 5 mg per mL.
- Volume = your dose divided by the concentration. 2 mg divided by 5 mg per mL is 0.4 mL.
- Units = volume multiplied by 100 on a U-100 syringe. 0.4 mL is 40 units.
The calculator also counts how many full doses the vial holds at that strength, and warns you when a single draw will not fit in the syringe you picked.
Worked examples
| Vial | Water | Dose | Concentration | Units |
|---|---|---|---|---|
| 5 mg | 1 mL | 1 mg | 5 mg/mL | 20 |
| 10 mg | 2 mL | 2 mg | 5 mg/mL | 40 |
| 10 mg | 1 mL | 4 mg | 10 mg/mL | 40 |
| 20 mg | 2 mL | 8 mg | 10 mg/mL | 80 |
| 30 mg | 3 mL | 12 mg | 10 mg/mL | 120, more than one 1 mL syringe |
Reading the syringe
A 1 mL U-100 syringe is usually numbered every 10 units with a line every 2 units. The smaller 0.3 mL and 0.5 mL syringes are marked in single units, which makes small doses easier to measure. Read the dose where the edge of the rubber stopper nearest the needle meets the scale.
Cost per milligram uses the same numbers
Price works the same way as dosing. If you are comparing retatrutide for sale across sellers, divide each price by the vial's milligrams before you look at the sticker, because a bigger vial often costs less per dose.
Frequently asked questions
How many units is 2 mg of retatrutide?
It depends on how much water went into the vial. A 10 mg vial mixed with 2 mL of bacteriostatic water holds 5 mg per mL, so 2 mg is 0.4 mL, which is 40 units on a U-100 syringe. The same vial mixed with 1 mL makes 2 mg read as 20 units.
What does U-100 mean on an insulin syringe?
U-100 syringes are marked so that 100 units equal 1 mL. A 0.3 mL syringe holds 30 units, a 0.5 mL syringe 50 units and a 1 mL syringe 100 units.
Why does the calculator warn that a dose will not fit?
When the volume for your dose is larger than the syringe holds, one draw cannot deliver it. You can use a larger syringe, split the dose into two draws, or mix the next vial with less water so each unit carries more medicine.
Does this calculator tell me what dose to take?
No. It only converts milligrams into syringe units. Dose decisions belong with a clinician who knows your history.