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Quick answer: it depends on how the vial was mixed. Units on an insulin syringe = dose in mcg ÷ (concentration in mg/mL × 10). So 300 mcg is 12 units at 2.5 mg/mL, but 6 units at 5 mg/mL. Find your concentration below, or let the calculator do it.
Each column is one concentration, with a common way to mix it. The number is the same on a 0.5 mL (50-unit) or 1 mL (100-unit) insulin syringe; a 0.5 mL syringe just tops out at 50.
| Dose | 1 mg/mL 5 mg vial + 5 mL | 2 mg/mL 5 mg vial + 2.5 mL | 2.5 mg/mL 5 mg vial + 2 mL | 3.33 mg/mL 10 mg vial + 3 mL | 5 mg/mL 10 mg vial + 2 mL |
|---|---|---|---|---|---|
| 100 mcg | 10 | 5 | 4 | 3 | 2 |
| 200 mcg | 20 | 10 | 8 | 6 | 4 |
| 250 mcg | 25 | 12.5 | 10 | 7.5 | 5 |
| 300 mcg | 30 | 15 | 12 | 9 | 6 |
| 400 mcg | 40 | 20 | 16 | 12 | 8 |
| 500 mcg | 50 | 25 | 20 | 15 | 10 |
| 750 mcg | 75 | 37.5 | 30 | 22.5 | 15 |
| 1 mg | 100 | 50 | 40 | 30 | 20 |
| 1.5 mg | over 1 mL | 75 | 60 | 45 | 30 |
| 2 mg | over 1 mL | 100 | 80 | 60.1 | 40 |
| 2.5 mg | over 1 mL | over 1 mL | 100 | 75.1 | 50 |
Rounded to a tenth of a unit. "Over 1 mL" means the dose needs more than one full 1 mL syringe at that concentration.
Concentration = mg in the vial ÷ mL of bacteriostatic water you added. A 5 mg vial with 2 mL of water is 2.5 mg/mL; a 10 mg vial with 3 mL is 3.33 mg/mL. If your numbers aren't in the chart, the peptide calculator works any mix, and every compound page lists the standard water per vial size.
Informational use only — not medical advice. This is arithmetic: it converts an amount to a syringe reading and does not say what or how much to take.
It depends on the concentration of your vial. At 2.5 mg/mL (a 5 mg vial with 2 mL of water) 300 mcg is 12 units on a U-100 insulin syringe; at 5 mg/mL it is 6 units; at 1 mg/mL it is 30 units.
At 2.5 mg/mL, 250 mcg is 10 units on a U-100 syringe. At 2 mg/mL it is 12.5 units, and at 5 mg/mL it is 5 units.
At 2.5 mg/mL, 500 mcg is 20 units on a U-100 syringe. At 5 mg/mL it is 10 units, and at 1 mg/mL it is 50 units.
1 mg is 1,000 mcg. At 2.5 mg/mL that is 40 units on a U-100 syringe; at 5 mg/mL it is 20 units.
Units on an insulin syringe = dose in mcg ÷ (concentration in mg/mL × 10). Concentration = mg in the vial ÷ mL of water added.
No. Standard insulin syringes all use the U-100 scale: 100 units = 1 mL. A 0.5 mL syringe (often called U-50 or a 50-unit syringe) just holds less and has wider spacing between marks, so a dose reads the same number of units on it as on a 1 mL syringe, as long as it is 50 units or less. Syringes made for other insulin strengths (such as U-40) use a different scale, so these numbers don't apply to them.
Dosify Me does this math for you. Pick the compound, your vial size and dose, and the app draws the exact syringe reading, keeps your schedule and reminders, and logs every dose — privately, on your phone.
Pre-filled with each compound's vial sizes, standard water and common doses: