16.667 mg/mL · 16,667 mcg/mL · 166.67 mcg per U-100 unit

50 mg vial + 3 mL bacteriostatic water

A 50 mg vial reconstituted with 3 mL comes to 16.667 mg/mL. Every unit on a U-100 insulin syringe then carries 166.67 mcg, so 5 mg is 30 units (0.3 mL) and the vial holds 10 draws of that size.

Units for each amount

50 mg vial + 3 mL = 16.667 mg/mL (16,667 mcg/mL, 166.67 mcg per unit on U-100)
Dose	mL	U-100 units	U-40 units	Doses per vial
50 mcg	0.003	0.3	0.12	1000
100 mcg	0.006	0.6	0.24	500
150 mcg	0.009	0.9	0.36	333
200 mcg	0.012	1.2	0.48	250
250 mcg	0.015	1.5	0.6	200
300 mcg	0.018	1.8	0.72	166
400 mcg	0.024	2.4	0.96	125
500 mcg	0.03	3	1.2	100
750 mcg	0.045	4.5	1.8	66
1 mg	0.06	6	2.4	50
1.5 mg	0.09	9	3.6	33
2 mg	0.12	12	4.8	25
2.5 mg	0.15	15	6	20
5 mg	0.3	30	12	10
10 mg	0.6	60	24	5

Same vial, other volumes

The mass does not move. Only the concentration and the unit count do.

Water	mg/mL	mcg per unit	5 mg =
1 mL	50	500	10 units	table →
1.5 mL	33.333	333.33	15 units	table →
2 mL	25	250	20 units	table →
2.5 mL	20	200	25 units	table →
3 mL	16.667	166.67	30 units
5 mL	10	100	50 units	table →

Try other numbers

50 mg + 3 mL questions

What concentration is 50 mg in 3 mL?

50 mg divided by 3 mL is 16.667 mg/mL, which is 16,667 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 166.67 mcg.

How many units is 5 mg from a 50 mg vial with 3 mL?

5000 mcg divided by 16,667 mcg/mL is 0.3 mL, which is 30 units on a U-100 syringe and 12 units on a U-40 syringe. The vial holds 10 draws of that size.

What if I add 5 mL instead of 3 mL to the 50 mg vial?

The mass stays 50 mg. With 5 mL the concentration is 10 mg/mL instead of 16.667 mg/mL, so the same amount per draw needs more units: 5 mg becomes 50 units instead of 30.

Does a 50 mg vial hold 3 mL?

Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 3 mL fits with room to swirl. Check the vial if it is an unusually small format.

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