20 mg/mL · 20,000 mcg/mL · 200 mcg per U-100 unit

20 mg vial + 1 mL bacteriostatic water

A 20 mg vial reconstituted with 1 mL comes to 20 mg/mL. Every unit on a U-100 insulin syringe then carries 200 mcg, so 500 mcg is 2.5 units (0.025 mL) and the vial holds 40 draws of that size.

Units for each amount

20 mg vial + 1 mL = 20 mg/mL (20,000 mcg/mL, 200 mcg per unit on U-100)
Dose	mL	U-100 units	U-40 units	Doses per vial
50 mcg	0.0025	0.25	0.1	400
100 mcg	0.005	0.5	0.2	200
150 mcg	0.0075	0.75	0.3	133
200 mcg	0.01	1	0.4	100
250 mcg	0.013	1.3	0.5	80
300 mcg	0.015	1.5	0.6	66
400 mcg	0.02	2	0.8	50
500 mcg	0.025	2.5	1	40
750 mcg	0.038	3.8	1.5	26
1 mg	0.05	5	2	20
1.5 mg	0.075	7.5	3	13
2 mg	0.1	10	4	10
2.5 mg	0.13	12.5	5	8
5 mg	0.25	25	10	4
10 mg	0.5	50	20	2

Same vial, other volumes

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

Water	mg/mL	mcg per unit	500 mcg =
0.5 mL	40	400	1.3 units	table →
1 mL	20	200	2.5 units
1.5 mL	13.333	133.33	3.8 units	table →
2 mL	10	100	5 units	table →
2.5 mL	8	80	6.3 units	table →
3 mL	6.667	66.67	7.5 units	table →
5 mL	4	40	12.5 units	table →

Same concentration, different vial

These pairs also come to 20 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 10 mg + 0.5 mL, 30 mg + 1.5 mL, 50 mg + 2.5 mL, 60 mg + 3 mL.

Try other numbers

20 mg + 1 mL questions

What concentration is 20 mg in 1 mL?

20 mg divided by 1 mL is 20 mg/mL, which is 20,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 200 mcg.

How many units is 500 mcg from a 20 mg vial with 1 mL?

500 mcg divided by 20,000 mcg/mL is 0.025 mL, which is 2.5 units on a U-100 syringe and 1 units on a U-40 syringe. The vial holds 40 draws of that size.

What if I add 1.5 mL instead of 1 mL to the 20 mg vial?

The mass stays 20 mg. With 1.5 mL the concentration is 13.333 mg/mL instead of 20 mg/mL, so the same amount per draw needs more units: 500 mcg becomes 3.8 units instead of 2.5.

Does a 20 mg vial hold 1 mL?

Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 1 mL fits with room to swirl. Check the vial if it is an unusually small format.

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