PeptideCalculations
0.5 mg/mL · 500 mcg/mL · 5 mcg per U-100 unit

1 mg vial + 2 mL bacteriostatic water

A 1 mg vial reconstituted with 2 mL comes to 0.5 mg/mL. Every unit on a U-100 insulin syringe then carries 5 mcg, so 100 mcg is 20 units (0.2 mL) and the vial holds 10 draws of that size.

Units for each amount

1 mg vial + 2 mL = 0.5 mg/mL (500 mcg/mL, 5 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.110420
100 mcg0.220810
150 mcg0.330126
200 mcg0.440165
250 mcg0.550204
300 mcg0.660243
400 mcg0.880322
500 mcg1100402
750 mcg1.5150601
1 mg2200801

Same vial, other volumes

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

Watermg/mLmcg per unit100 mcg =
0.5 mL2205 unitstable →
1 mL11010 unitstable →
1.5 mL0.6676.6715 unitstable →
2 mL0.5520 units
2.5 mL0.4425 unitstable →
3 mL0.3333.3330 unitstable →

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

1 mg + 2 mL questions

What concentration is 1 mg in 2 mL?

1 mg divided by 2 mL is 0.5 mg/mL, which is 500 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 5 mcg.

How many units is 100 mcg from a 1 mg vial with 2 mL?

100 mcg divided by 500 mcg/mL is 0.2 mL, which is 20 units on a U-100 syringe and 8 units on a U-40 syringe. The vial holds 10 draws of that size.

What if I add 2.5 mL instead of 2 mL to the 1 mg vial?

The mass stays 1 mg. With 2.5 mL the concentration is 0.4 mg/mL instead of 0.5 mg/mL, so the same amount per draw needs more units: 100 mcg becomes 25 units instead of 20.

Does a 1 mg vial hold 2 mL?

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

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