Units to mg Calculator
Two-way conversion between U-100 syringe units and mg (or mcg). You need one thing from the label: the concentration in mg/mL.
Type in either Units or Amount — the other fills in.
The two formulas
- Units → mg: mg = units ÷ 100 × concentration (mg/mL)
- mg → units: units = mg ÷ concentration (mg/mL) × 100
Don't know the concentration? It's the vial's total mg ÷ total mL — e.g. a 10 mg vial mixed with 2 mL is 5 mg/mL. The dose calculator does that step for you.
Units to mg chart
mg contained in a given number of U-100 units, by concentration. Reference arithmetic only.
| Units ↓ / mg/mL → | 1 | 2 | 2.5 | 5 | 10 | 12.5 | 20 |
|---|---|---|---|---|---|---|---|
| 5 units (0.05 mL) | 0.05 mg | 0.1 mg | 0.125 mg | 0.25 mg | 0.5 mg | 0.625 mg | 1 mg |
| 10 units (0.1 mL) | 0.1 mg | 0.2 mg | 0.25 mg | 0.5 mg | 1 mg | 1.25 mg | 2 mg |
| 15 units (0.15 mL) | 0.15 mg | 0.3 mg | 0.375 mg | 0.75 mg | 1.5 mg | 1.875 mg | 3 mg |
| 20 units (0.2 mL) | 0.2 mg | 0.4 mg | 0.5 mg | 1 mg | 2 mg | 2.5 mg | 4 mg |
| 25 units (0.25 mL) | 0.25 mg | 0.5 mg | 0.625 mg | 1.25 mg | 2.5 mg | 3.125 mg | 5 mg |
| 30 units (0.3 mL) | 0.3 mg | 0.6 mg | 0.75 mg | 1.5 mg | 3 mg | 3.75 mg | 6 mg |
| 40 units (0.4 mL) | 0.4 mg | 0.8 mg | 1 mg | 2 mg | 4 mg | 5 mg | 8 mg |
| 50 units (0.5 mL) | 0.5 mg | 1 mg | 1.25 mg | 2.5 mg | 5 mg | 6.25 mg | 10 mg |
| 60 units (0.6 mL) | 0.6 mg | 1.2 mg | 1.5 mg | 3 mg | 6 mg | 7.5 mg | 12 mg |
| 80 units (0.8 mL) | 0.8 mg | 1.6 mg | 2 mg | 4 mg | 8 mg | 10 mg | 16 mg |
| 100 units (1 mL) | 1 mg | 2 mg | 2.5 mg | 5 mg | 10 mg | 12.5 mg | 20 mg |
Working in mcg? See the mcg to units chart. Drug-specific versions: tirzepatide units to mg · semaglutide units to mg.
FAQ
How do I convert units to mg?
mg = (units ÷ 100) × concentration in mg/mL, for a U-100 syringe. Example: 20 units at 5 mg/mL = 0.2 mL × 5 = 1 mg.
How do I convert mg to units?
units = (mg ÷ concentration in mg/mL) × 100. Example: 2.5 mg at 10 mg/mL = 0.25 mL = 25 units.
Why is there no single "units to mg" number?
Because syringe units measure volume (1 unit = 0.01 mL), not weight. The mg in a unit depends entirely on how concentrated the liquid is.
Does this apply to insulin?
Insulin is labeled in international units (IU), where U-100 means 100 IU per mL. This page is for medications labeled in mg or mcg drawn with a U-100 syringe; for insulin follow your prescriber.
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