How many units is each Retatrutide amount?
At 10 mg + 2 mL (5 mg/mL) on a U-100 syringe:
Generated from the calculator's own functions. Rows are evenly spaced reference amounts, not suggested amounts. Amber readings don't fit a 100-unit barrel.
| Amount | mcg | Volume (mL) | Syringe units |
|---|---|---|---|
| 0.25 mg | 250 | 0.05 | 5 |
| 0.5 mg | 500 | 0.1 | 10 |
| 1 mg | 1,000 | 0.2 | 20 |
| 2 mg | 2,000 | 0.4 | 40 |
| 2.5 mg | 2,500 | 0.5 | 50 |
| 3 mg | 3,000 | 0.6 | 60 |
| 4 mg | 4,000 | 0.8 | 80 |
| 5 mg | 5,000 | 1 | 100 |
| 6 mg | 6,000 | 1.2 | 120 (> 100) |
| 7.5 mg | 7,500 | 1.5 | 150 (> 100) |
| 8 mg | 8,000 | 1.6 | 160 (> 100) |
| 10 mg | 10,000 | 2 | 200 (> 100) |
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How much water for each Retatrutide vial size?
Retatrutide is sold in 8 common sizes (5 mg, 10 mg, 12 mg, 15 mg, 20 mg, 24 mg, 30 mg, 40 mg). The same water volume gives a different concentration in each, so the same reading means a different amount. Each cell shows mcg per unit with mg/mL in brackets.
| Vial | 1 mL | 2 mL | 3 mL |
|---|---|---|---|
| 5 mg | 50 (5) | 25 (2.5) | 16.67 (1.67) |
| 10 mg | 100 (10) | 50 (5) | 33.33 (3.33) |
| 12 mg | 120 (12) | 60 (6) | 40 (4) |
| 15 mg | 150 (15) | 75 (7.5) | 50 (5) |
| 20 mg | 200 (20) | 100 (10) | 66.67 (6.67) |
| 24 mg | 240 (24) | 120 (12) | 80 (8) |
| 30 mg | 300 (30) | 150 (15) | 100 (10) |
| 40 mg | 400 (40) | 200 (20) | 133.3 (13.33) |
How much bacteriostatic water for a 5 mg Retatrutide vial?
1 mL → 5 mg/mL, so 2 mg is 40 units. 2 mL → 2.5 mg/mL, so 2 mg is 80 units. 3 mL → 1.67 mg/mL, so 2 mg is 120 units. The whole vial holds 2 draws of 2 mg. Full 5 mg Retatrutide page →
How much bacteriostatic water for a 10 mg Retatrutide vial?
1 mL → 10 mg/mL, so 2 mg is 20 units. 2 mL → 5 mg/mL, so 2 mg is 40 units. 3 mL → 3.33 mg/mL, so 2 mg is 60 units. The whole vial holds 5 draws of 2 mg. Full 10 mg Retatrutide page →
How much bacteriostatic water for a 12 mg Retatrutide vial?
1 mL → 12 mg/mL, so 2 mg is 16.7 units. 2 mL → 6 mg/mL, so 2 mg is 33.3 units. 3 mL → 4 mg/mL, so 2 mg is 50 units. The whole vial holds 6 draws of 2 mg. Full 12 mg Retatrutide page →
How much bacteriostatic water for a 15 mg Retatrutide vial?
1 mL → 15 mg/mL, so 2 mg is 13.3 units. 2 mL → 7.5 mg/mL, so 2 mg is 26.7 units. 3 mL → 5 mg/mL, so 2 mg is 40 units. The whole vial holds 7 draws of 2 mg. Full 15 mg Retatrutide page →
How much bacteriostatic water for a 20 mg Retatrutide vial?
1 mL → 20 mg/mL, so 2 mg is 10 units. 2 mL → 10 mg/mL, so 2 mg is 20 units. 3 mL → 6.67 mg/mL, so 2 mg is 30 units. The whole vial holds 10 draws of 2 mg. Full 20 mg Retatrutide page →
How much bacteriostatic water for a 24 mg Retatrutide vial?
1 mL → 24 mg/mL, so 2 mg is 8.3 units. 2 mL → 12 mg/mL, so 2 mg is 16.7 units. 3 mL → 8 mg/mL, so 2 mg is 25 units. The whole vial holds 12 draws of 2 mg. Full 24 mg Retatrutide page →
How much bacteriostatic water for a 30 mg Retatrutide vial?
1 mL → 30 mg/mL, so 2 mg is 6.7 units. 2 mL → 15 mg/mL, so 2 mg is 13.3 units. 3 mL → 10 mg/mL, so 2 mg is 20 units. The whole vial holds 15 draws of 2 mg. Full 30 mg Retatrutide page →
How much bacteriostatic water for a 40 mg Retatrutide vial?
1 mL → 40 mg/mL, so 2 mg is 5 units. 2 mL → 20 mg/mL, so 2 mg is 10 units. 3 mL → 13.33 mg/mL, so 2 mg is 15 units. The whole vial holds 20 draws of 2 mg. Full 40 mg Retatrutide page →
Worked example: 10 mg vial, 2 mL, 2 mg
- Concentration. 10 mg ÷ 2 mL = 5 mg/mL (5,000 mcg/mL).
- Volume. 2 mg ÷ 5 mg/mL = 0.4 mL.
- Units. 0.4 mL × 100 = 40 units on a U-100 syringe.
- Check. One unit holds 50 mcg; 40 × 50 mcg = 2,000 mcg = 2 mg, which matches. The vial holds 5 draws of this size.
Retatrutide: notes for the arithmetic
Retatrutide is sold in more vial sizes than almost any other compound (5 mg to 40 mg), so the same "units" reading means very different amounts from one vial to the next. A 40-unit draw is 2 mg from a 10 mg / 2 mL vial but 8 mg from a 40 mg / 2 mL vial. Always recompute when the vial size changes.
For the lab procedure itself (materials, aseptic technique, mixing without foaming) see how to reconstitute Retatrutide. For what bacteriostatic water is and how long an opened vial is kept, see the bacteriostatic water guide and the storage guide.
Exact-value lookup: how many units is 2 mg of Retatrutide.
Frequently asked questions
How many units is 2 mg of Retatrutide?
It depends on the water volume. 10 mg + 2 mL = 5 mg/mL, so 2 mg is 0.4 mL, or 40 units on a U-100 syringe. With 1 mL instead it would be 20 units.
How much bacteriostatic water for a 5 mg Retatrutide vial?
There is no single correct volume. 1 mL gives 5 mg/mL (50 mcg per unit); 2 mL gives 2.5 mg/mL (25 mcg per unit); 3 mL gives 1.67 mg/mL (16.67 mcg per unit). Pick the volume that makes your reading easy to measure on the barrel you have.
How much bacteriostatic water for a 10 mg Retatrutide vial?
There is no single correct volume. 1 mL gives 10 mg/mL (100 mcg per unit); 2 mL gives 5 mg/mL (50 mcg per unit); 3 mL gives 3.33 mg/mL (33.33 mcg per unit). Pick the volume that makes your reading easy to measure on the barrel you have.
How much bacteriostatic water for a 12 mg Retatrutide vial?
There is no single correct volume. 1 mL gives 12 mg/mL (120 mcg per unit); 2 mL gives 6 mg/mL (60 mcg per unit); 3 mL gives 4 mg/mL (40 mcg per unit). Pick the volume that makes your reading easy to measure on the barrel you have.
How many mg of Retatrutide is 10 units?
10 units on a U-100 syringe is 0.1 mL. At 5 mg/mL (10 mg in 2 mL) that is 0.5 mg (500 mcg). At a different concentration the answer is different.
Is this a Retatrutide dosing calculator?
It is an arithmetic tool. It converts an amount you enter into a volume and a syringe reading; it does not suggest amounts, schedules or uses. Investigational. Retatrutide is not approved by the FDA for any use; Eli Lilly is still studying it in phase 3 trials (for example TRIUMPH-1, NCT05929066), and FDA states that it cannot be used in compounding under federal law.
Sources
- What to know about retatrutide
- FDA's Concerns with Unapproved GLP-1 Drugs Used for Weight Loss
- A Study of Retatrutide (LY3437943) in Participants Who Have Obesity or Overweight (TRIUMPH-1), NCT05929066
- Triple-Hormone-Receptor Agonist Retatrutide for Obesity — A Phase 2 Trial
- FDA alerts health care providers, compounders and patients of dosing errors associated with compounded injectable semaglutide products
Links checked 2026-10-19.