mg to Units Converter
Type a dose in mg or a number of units — the other updates instantly, based on how your vial was mixed.
Your vial
Use the confirmed final solution volume, which may differ from the diluent volume added. These example values are not mixing instructions.
Concentration: 5 mg/mL · 50 mcg per unit
2.5 mg = 50 units = 0.5 mL
Quick reference
Units → dose at your concentration
5 mg/mL · 50 mcg per unit
Arithmetic examples only. These amounts are not suggested doses.
2 units
100 mcg
0.02 mL
5 units
250 mcg
0.05 mL
10 units
500 mcg
0.1 mL
15 units
750 mcg
0.15 mL
20 units
1 mg
0.2 mL
25 units
1.25 mg
0.25 mL
30 units
1.5 mg
0.3 mL
40 units
2 mg
0.4 mL
50 units
2.5 mg
0.5 mL
60 units
3 mg
0.6 mL
75 units
3.75 mg
0.75 mL
100 units
5 mg
1 mL
Good to know
mg and units, explained
How many units is 1 mg?
It depends on the concentration. At 5 mg/mL, 1 mg = 0.2 mL = 20 units. At 2.5 mg/mL, 1 mg = 0.4 mL = 40 units. Units = (mg ÷ concentration in mg/mL) × 100.
Why does the same dose need different units?
Units measure liquid volume, not medication. The same mg spread across more liquid gives a lower concentration, so each dose takes more units. Use the labeled concentration or the confirmed final solution volume, which may differ from the diluent volume added.
Does this work for any U-100 syringe?
Yes. On every U-100 syringe 100 units = 1 mL; only the barrel size and the spacing of the marks differ.