1 mg/mL · 1,000 mcg/mL · 10 mcg per U-100 unit

3 mg vial + 3 mL bacteriostatic water

A 3 mg vial reconstituted with 3 mL comes to 1 mg/mL. Every unit on a U-100 insulin syringe then carries 10 mcg, so 250 mcg is 25 units (0.25 mL) and the vial holds 12 draws of that size.

Units for each amount

3 mg vial + 3 mL = 1 mg/mL (1,000 mcg/mL, 10 mcg per unit on U-100)
Dose	mL	U-100 units	U-40 units	Doses per vial
50 mcg	0.05	5	2	60
100 mcg	0.1	10	4	30
150 mcg	0.15	15	6	20
200 mcg	0.2	20	8	15
250 mcg	0.25	25	10	12
300 mcg	0.3	30	12	10
400 mcg	0.4	40	16	7
500 mcg	0.5	50	20	6
750 mcg	0.75	75	30	4
1 mg	1	100	40	3
1.5 mg	1.5	150	60	2
2 mg	2	200	80	1
2.5 mg	2.5	250	100	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	6	60	4.2 units	table →
1 mL	3	30	8.3 units	table →
1.5 mL	2	20	12.5 units	table →
2 mL	1.5	15	16.7 units	table →
2.5 mL	1.2	12	20.8 units	table →
3 mL	1	10	25 units
5 mL	0.6	6	41.7 units	table →

Same concentration, different vial

These pairs also come to 1 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 1 mg + 1 mL, 2 mg + 2 mL, 5 mg + 5 mL.

Try other numbers

3 mg + 3 mL questions

What concentration is 3 mg in 3 mL?

3 mg divided by 3 mL is 1 mg/mL, which is 1,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 10 mcg.

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

250 mcg divided by 1,000 mcg/mL is 0.25 mL, which is 25 units on a U-100 syringe and 10 units on a U-40 syringe. The vial holds 12 draws of that size.

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

The mass stays 3 mg. With 5 mL the concentration is 0.6 mg/mL instead of 1 mg/mL, so the same amount per draw needs more units: 250 mcg becomes 41.7 units instead of 25.

Does a 3 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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