mcg to Syringe Units Converter
The answer depends on concentration. A 250 mcg target does not map to one universal syringe mark, because the units change when the vial is diluted to 1 mg/mL versus 5 mg/mL or 10 mg/mL.
Lookup reference only. These tables convert visible concentration examples into U-100 syringe units and back. They are not dosing instructions or regimen recommendations.
250 mcg at 2.5 mg/mL =
10 units
Concentration math only — use the full calculator for custom vials, or see the disclaimer.
mcg to units lookup table
| Dose | 1 mg/mL | 2 mg/mL | 2.5 mg/mL | 5 mg/mL | 10 mg/mL |
|---|---|---|---|---|---|
| 100 mcg | 10 units | 5 units | 4 units | 2 units | 1 units |
| 200 mcg | 20 units | 10 units | 8 units | 4 units | 2 units |
| 250 mcg | 25 units | 12.5 units | 10 units | 5 units | 2.5 units |
| 500 mcg | 50 units | 25 units | 20 units | 10 units | 5 units |
| 1000 mcg | 100 units | 50 units | 40 units | 20 units | 10 units |
Units to mcg lookup table
| Units | 1 mg/mL | 2 mg/mL | 2.5 mg/mL | 5 mg/mL | 10 mg/mL |
|---|---|---|---|---|---|
| 1 units | 10 mcg | 20 mcg | 25 mcg | 50 mcg | 100 mcg |
| 2 units | 20 mcg | 40 mcg | 50 mcg | 100 mcg | 200 mcg |
| 5 units | 50 mcg | 100 mcg | 125 mcg | 250 mcg | 500 mcg |
| 10 units | 100 mcg | 200 mcg | 250 mcg | 500 mcg | 1000 mcg |
| 20 units | 200 mcg | 400 mcg | 500 mcg | 1000 mcg | 2000 mcg |
| 25 units | 250 mcg | 500 mcg | 625 mcg | 1250 mcg | 2500 mcg |
| 50 units | 500 mcg | 1000 mcg | 1250 mcg | 2500 mcg | 5000 mcg |
Popular dose conversions
Jump to a dedicated page for a specific dose. Each one shows that dose across every standard concentration, the reconstitution recipes that produce it, and which syringe size reads most cleanly.
250 mcg to units
Full U-100 chart, reconstitution recipes, and syringe guidance for 250 mcg.
200 mcg to units
Full U-100 chart, reconstitution recipes, and syringe guidance for 200 mcg.
2 mg to units
Full U-100 chart, reconstitution recipes, and syringe guidance for 2 mg.
How to find your concentration
Start with the vial amount in mg and divide by the amount of liquid added in mL.
Concentration (mg/mL) = total peptide in mg ÷ reconstitution volume in mL
Example: 5 mg ÷ 2 mL = 2.5 mg/mL. On a U-100 syringe, that means each unit holds 25 mcg.
When to use the full calculator
Use the full calculator when your concentration does not match one of the columns above, when you need to check syringe-capacity limits, or when you want the calculation broken out step by step.