Retatrutide Dosage Calculator: Bac Water, Concentration and Units

Retatrutide Reconstitution Calculator

Reconstituting Retatrutide

Retatrutide is supplied as lyophilized powder in 10mg, 20mg and 30mg vials, and has to be dissolved in bacteriostatic water before it can be measured. The fill never changes, only the concentration does: a 10mg vial with 1 mL of water gives 10 mg per mL, with 2 mL it gives 5 mg per mL. Most labs choose the volume that puts the amounts they measure between about 10 and 100 units on the syringe, where the markings are easiest to read.

A standard 3 mL vial holds up to about 3 mL of liquid, so the 30mg vial reaches its lowest practical concentration, 10 mg per mL, at 3 mL. For very small volumes, a 0.3 mL or 0.5 mL U-100 syringe spaces its markings further apart than a 1 mL syringe.

Retatrutide reconstitution chart

Concentration for each vial size and water volume. On a U-100 insulin syringe, 10 units is 0.1 mL and 100 units is 1 mL.

Vial	Bac water added	Concentration	Per 10 units (0.1 mL)	Per 1 unit
10 mg	1 mL	10 mg/mL	1 mg (1000 mcg)	100 mcg
10 mg	2 mL	5 mg/mL	0.5 mg (500 mcg)	50 mcg
10 mg	3 mL	3.333 mg/mL	0.333 mg (333.333 mcg)	33.333 mcg
20 mg	1 mL	20 mg/mL	2 mg (2000 mcg)	200 mcg
20 mg	2 mL	10 mg/mL	1 mg (1000 mcg)	100 mcg
20 mg	3 mL	6.667 mg/mL	0.667 mg (666.667 mcg)	66.667 mcg
30 mg	1 mL	30 mg/mL	3 mg (3000 mcg)	300 mcg
30 mg	2 mL	15 mg/mL	1.5 mg (1500 mcg)	150 mcg
30 mg	3 mL	10 mg/mL	1 mg (1000 mcg)	100 mcg

The formula behind the calculator

concentration (mg/mL) = Retatrutide in vial (mg) ÷ water added (mL)

units on a U-100 syringe = amount (mg) ÷ concentration (mg/mL) × 100

Amounts in micrograms are divided by 1,000 first. The calculator does this arithmetic only; it does not recommend an amount, and Retatrutide from AminoBlend is supplied for laboratory research use only.

Buy Retatrutide Online in the Size This Chart Uses

The chart covers each fill we sell, so buy the matching retatrutide vial: 10mg at $129, 20mg at $209 or 30mg at $289. Shop the retatrutide starter kit to get the vial, water and syringe in one order, or the ready-mixed retatrutide pen when no reconstitution is wanted. All are online from Australian stock, no local supplier near me required.

Retatrutide Calculator Explained

Interpreting the Retatrutide Readout

The top line is retatrutide per millilitre: the 10, 20 or 30mg fill divided by the water added. Below it, mcg per 0.1 mL is that concentration times 100. The volume line is the target mass over the concentration, and the units line is the same volume expressed on a U-100 scale, so 0.2 mL appears as 20 units.

A 2 mg Retatrutide Target for Each Vial Size

10mg vial at 1, 2 or 3 mL: 10, 5 or 3.333 mg/mL; 1,000, 500 or about 333 mcg per 0.1 mL; 2 mg is 0.2, 0.4 or 0.6 mL, which reads 20, 40 or 60 units.
20mg vial: 20, 10 or 6.667 mg/mL; 2,000, 1,000 or about 667 mcg per 0.1 mL; 2 mg is 0.1, 0.2 or 0.3 mL, or 10, 20 or 30 units.
30mg vial: 30, 15 or 10 mg/mL; 3,000, 1,500 or 1,000 mcg per 0.1 mL; 2 mg is about 0.067, 0.133 or 0.2 mL, or roughly 6.7, 13.3 or 20 units.

Water Volumes That Give Retatrutide Clean Readings

Some combinations land between graduations: the 30mg vial at 1 or 2 mL turns a 2 mg target into 6.7 or 13.3 units, which cannot be read exactly. The same vial at 3 mL gives a round 10 mg/mL and 20 units. Picking the water volume that makes the concentration a whole number, such as 2 mL for the 20mg or 3 mL for the 30mg retatrutide vial, keeps every unit worth a tidy amount.

Retatrutide Mass and Molar Conversion

Retatrutide is a fatty acid modified 39 residue peptide of about 4.73 kDa, roughly 4,731 g/mol. A 10 mg/mL stock is therefore around 2.1 mM, and a 1 micromolar working solution holds about 4.73 mcg per mL. Background on the molecule is in what retatrutide is.

Retatrutide Calculator Mistakes

Entering the retatrutide pen as a vial and adding water; the pen is already in solution at about 3.3 mg/mL, so enter 10mg and 3 mL to mirror it.
Typing 2 in the mcg field for a 2 mg target, a thousandfold error.
Leaving the fill at the 10mg default while the 30mg vial is on the bench, so every volume comes out three times too large.
Logging 40 units as 4 mL instead of 0.4 mL.

Retatrutide Calculator Questions

How much bac water for 10mg retatrutide?

There is no single correct volume. 1 mL gives 10 mg per mL, 2 mL gives 5 mg per mL and 3 mL gives about 3.33 mg per mL. Choose the volume that makes the amounts your protocol measures easy to read on a U-100 syringe; the calculator shows the result for any volume.

How much bac water for 20mg retatrutide?

Adding 2 mL to a 20mg vial gives 10 mg per mL, and 3 mL gives about 6.67 mg per mL. A 3 mL vial will not hold much more than 3 mL, so for a weaker solution split the work across two smaller vials instead.

How do I convert retatrutide mg to units?

Divide the amount in mg by the concentration in mg per mL to get millilitres, then multiply by 100 for units on a U-100 syringe. At 5 mg per mL, 0.5 mg is 0.1 mL, which is 10 units.

How long does reconstituted retatrutide last?

Once mixed with bacteriostatic water, keep the vial at 2 to 8 °C and use it within about 28 days of the first puncture, the usual limit for a multi-dose vial. Unmixed powder keeps longer; see our storage guide.