1.667 mg/mL · 1,667 mcg/mL · 16.67 mcg per U-100 unit

5 mg vial + 3 mL bacteriostatic water

A 5 mg vial reconstituted with 3 mL comes to 1.667 mg/mL. Every unit on a U-100 insulin syringe then carries 16.67 mcg, so 250 mcg is 15 units (0.15 mL) and the vial holds 20 draws of that size.

Units for each amount

5 mg vial + 3 mL = 1.667 mg/mL (1,667 mcg/mL, 16.67 mcg per unit on U-100)
Dose	mL	U-100 units	U-40 units	Doses per vial
50 mcg	0.03	3	1.2	100
100 mcg	0.06	6	2.4	50
150 mcg	0.09	9	3.6	33
200 mcg	0.12	12	4.8	25
250 mcg	0.15	15	6	20
300 mcg	0.18	18	7.2	16
400 mcg	0.24	24	9.6	12
500 mcg	0.3	30	12	10
750 mcg	0.45	45	18	6
1 mg	0.6	60	24	5
1.5 mg	0.9	90	36	3
2 mg	1.2	120	48	2
2.5 mg	1.5	150	60	2
5 mg	3	300	120	1

Same vial, other volumes

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

Water	mg/mL	mcg per unit	250 mcg =
0.5 mL	10	100	2.5 units	table →
1 mL	5	50	5 units	table →
1.5 mL	3.333	33.33	7.5 units	table →
2 mL	2.5	25	10 units	table →
2.5 mL	2	20	12.5 units	table →
3 mL	1.667	16.67	15 units
5 mL	1	10	25 units	table →

Try other numbers

5 mg + 3 mL questions

What concentration is 5 mg in 3 mL?

5 mg divided by 3 mL is 1.667 mg/mL, which is 1,667 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 16.67 mcg.

How many units is 250 mcg from a 5 mg vial with 3 mL?

250 mcg divided by 1,667 mcg/mL is 0.15 mL, which is 15 units on a U-100 syringe and 6 units on a U-40 syringe. The vial holds 20 draws of that size.

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

The mass stays 5 mg. With 5 mL the concentration is 1 mg/mL instead of 1.667 mg/mL, so the same amount per draw needs more units: 250 mcg becomes 25 units instead of 15.

Does a 5 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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