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

1 mg vial + 0.5 mL bacteriostatic water

A 1 mg vial reconstituted with 0.5 mL comes to 2 mg/mL. Every unit on a U-100 insulin syringe then carries 20 mcg, so 100 mcg is 5 units (0.05 mL) and the vial holds 10 draws of that size.

Units for each amount

1 mg vial + 0.5 mL = 2 mg/mL (2,000 mcg/mL, 20 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.0252.5120
100 mcg0.055210
150 mcg0.0757.536
200 mcg0.11045
250 mcg0.1312.554
300 mcg0.151563
400 mcg0.22082
500 mcg0.2525102
750 mcg0.3837.5151
1 mg0.550201

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 units
1 mL11010 unitstable →
1.5 mL0.6676.6715 unitstable →
2 mL0.5520 unitstable →
2.5 mL0.4425 unitstable →
3 mL0.3333.3330 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: 2 mg + 1 mL, 3 mg + 1.5 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

1 mg + 0.5 mL questions

What concentration is 1 mg in 0.5 mL?

1 mg divided by 0.5 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 100 mcg from a 1 mg vial with 0.5 mL?

100 mcg divided by 2,000 mcg/mL is 0.05 mL, which is 5 units on a U-100 syringe and 2 units on a U-40 syringe. The vial holds 10 draws of that size.

What if I add 1 mL instead of 0.5 mL to the 1 mg vial?

The mass stays 1 mg. With 1 mL the concentration is 1 mg/mL instead of 2 mg/mL, so the same amount per draw needs more units: 100 mcg becomes 10 units instead of 5.

Does a 1 mg vial hold 0.5 mL?

Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 0.5 mL fits with room to swirl. Check the vial if it is an unusually small format.

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