Question 1

How many mL is 50 units?

Accepted Answer

0.5 mL on a U-100 insulin syringe — exactly the capacity of a 0.5 mL “50 unit” barrel. On a U-40 syringe 50 units is 1.25 mL, more than the barrel holds; on a U-500 syringe it is 0.1 mL.

Question 2

How many mL is 100 units?

Accepted Answer

1 mL on a U-100 syringe, which is the whole of a 1 mL “100 unit” barrel. 100 units is 2.5 mL on a U-40 scale and 0.2 mL on a U-500 scale.

Question 3

How many units are in 1 mL?

Accepted Answer

100 units on a U-100 insulin syringe, which is the scale on every human insulin syringe sold in the US except the dedicated U-500 barrel. On a U-40 veterinary syringe 1 mL is 40 units, and on a U-500 syringe it is 500 units. The U number is literally units per millilitre.

Question 4

How many units is 2 mL?

Accepted Answer

200 units on a U-100 scale. No standard insulin syringe holds that — the largest U-100 barrel is 1 mL (100 units) — so 2 mL is two full 1 mL syringes, or a 3 mL luer syringe marked in millilitres rather than units.

Question 5

How many units is 0.1 mL?

Accepted Answer

10 units on a U-100 syringe, 4 units on a U-40 syringe, and 50 units on a U-500 syringe.

Question 6

How many units is 0.5 mL?

Accepted Answer

50 units on a U-100 syringe — the full capacity of a 0.5 mL “50 unit” barrel. On a U-40 syringe 0.5 mL reads 20 units.

Question 7

How do you convert units to mL?

Accepted Answer

Divide the units by the syringe's U number. On a U-100 barrel: 20 units ÷ 100 = 0.2 mL, 75 units = 0.75 mL, 120 units = 1.2 mL. On a U-40 barrel, 20 units ÷ 40 = 0.5 mL.

Question 8

Does the drug change how many units are in a mL?

Accepted Answer

No. Syringe units measure liquid, so 0.2 mL is 20 units on a U-100 barrel whatever is dissolved in it. What changes with the drug and the concentration is how many milligrams that 0.2 mL contains — that is the mg to units question, which does need your vial concentration.

mL	U-100	U-40	U-500
0.05 mL	5 units	2 units	25 units
0.1 mL	10 units	4 units	50 units
0.2 mL	20 units	8 units	100 units
0.25 mL	25 units	10 units	125 units
0.3 mL	30 units	12 units	150 units
0.5 mL	50 units	20 units	250 units
0.75 mL	75 units	30 units	375 units
1 mL	100 units	40 units	500 units
1.5 mL	150 unitsover capacity	60 unitsover capacity	750 unitsover capacity
2 mL	200 unitsover capacity	80 unitsover capacity	1000 unitsover capacity
2.5 mL	250 unitsover capacity	100 unitsover capacity	1250 unitsover capacity
3 mL	300 unitsover capacity	120 unitsover capacity	1500 unitsover capacity

Units	U-100	U-40	U-500
5 units	0.05 mL	0.125 mL	0.01 mL
8 units	0.08 mL	0.2 mL	0.016 mL
10 units	0.1 mL	0.25 mL	0.02 mL
14 units	0.14 mL	0.35 mL	0.028 mL
15 units	0.15 mL	0.375 mL	0.03 mL
20 units	0.2 mL	0.5 mL	0.04 mL
25 units	0.25 mL	0.625 mL	0.05 mL
30 units	0.3 mL	0.75 mL	0.06 mL
33 units	0.33 mL	0.825 mL	0.066 mL
40 units	0.4 mL	1 mL	0.08 mL
50 units	0.5 mL	1.25 mLover capacity	0.1 mL
75 units	0.75 mL	1.875 mLover capacity	0.15 mL
80 units	0.8 mL	2 mLover capacity	0.16 mL
100 units	1 mL	2.5 mLover capacity	0.2 mL
120 units	1.2 mLover capacity	3 mLover capacity	0.24 mL
200 units	2 mLover capacity	5 mLover capacity	0.4 mL
240 units	2.4 mLover capacity	6 mLover capacity	0.48 mL

Units to mL Converter (and mL to Units) for Insulin Syringes

Units ↔ mL

mL to units table

Units to mL table

Which syringe holds how much

When you need milligrams, not millilitres

Common questions

Sources