PeptideCalculations
2 mg/mL · 2,000 mcg/mL · 20 mcg per U-100 unit

3 mg vial + 1.5 mL bacteriostatic water

A 3 mg vial reconstituted with 1.5 mL comes to 2 mg/mL. Every unit on a U-100 insulin syringe then carries 20 mcg, so 250 mcg is 12.5 units (0.13 mL) and the vial holds 12 draws of that size.

Units for each amount

3 mg vial + 1.5 mL = 2 mg/mL (2,000 mcg/mL, 20 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.0252.5160
100 mcg0.055230
150 mcg0.0757.5320
200 mcg0.110415
250 mcg0.1312.5512
300 mcg0.1515610
400 mcg0.22087
500 mcg0.2525106
750 mcg0.3837.5154
1 mg0.550203
1.5 mg0.7575302
2 mg1100401
2.5 mg1.25125501

Same vial, other volumes

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

Watermg/mLmcg per unit250 mcg =
0.5 mL6604.2 unitstable →
1 mL3308.3 unitstable →
1.5 mL22012.5 units
2 mL1.51516.7 unitstable →
2.5 mL1.21220.8 unitstable →
3 mL11025 unitstable →
5 mL0.6641.7 unitstable →

Same concentration, different vial

These pairs also come to 2 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 1 mg + 0.5 mL, 2 mg + 1 mL, 5 mg + 2.5 mL, 10 mg + 5 mL.

Try other numbers

mL
Draw to
—units
— mL on a U-100, 1 mL barrel
Concentration
—mg/mL
— mcg per unit
Doses in the vial
—
of

3 mg + 1.5 mL questions

What concentration is 3 mg in 1.5 mL?

3 mg divided by 1.5 mL is 2 mg/mL, which is 2,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 20 mcg.

How many units is 250 mcg from a 3 mg vial with 1.5 mL?

250 mcg divided by 2,000 mcg/mL is 0.13 mL, which is 12.5 units on a U-100 syringe and 5 units on a U-40 syringe. The vial holds 12 draws of that size.

What if I add 2 mL instead of 1.5 mL to the 3 mg vial?

The mass stays 3 mg. With 2 mL the concentration is 1.5 mg/mL instead of 2 mg/mL, so the same amount per draw needs more units: 250 mcg becomes 16.7 units instead of 12.5.

Does a 3 mg vial hold 1.5 mL?

Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 1.5 mL fits with room to swirl. Check the vial if it is an unusually small format.

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