PeptideCalculations
1.5 mg/mL · 1,500 mcg/mL · 15 mcg per U-100 unit

3 mg vial + 2 mL bacteriostatic water

A 3 mg vial reconstituted with 2 mL comes to 1.5 mg/mL. Every unit on a U-100 insulin syringe then carries 15 mcg, so 250 mcg is 16.7 units (0.17 mL) and the vial holds 12 draws of that size.

Units for each amount

3 mg vial + 2 mL = 1.5 mg/mL (1,500 mcg/mL, 15 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.0333.31.360
100 mcg0.0676.72.730
150 mcg0.110420
200 mcg0.1313.35.315
250 mcg0.1716.76.712
300 mcg0.220810
400 mcg0.2726.710.77
500 mcg0.3333.313.36
750 mcg0.550204
1 mg0.6766.726.73
1.5 mg1100402
2 mg1.33133.353.31
2.5 mg1.67166.766.71

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 unitstable →
2 mL1.51516.7 units
2.5 mL1.21220.8 unitstable →
3 mL11025 unitstable →
5 mL0.6641.7 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

3 mg + 2 mL questions

What concentration is 3 mg in 2 mL?

3 mg divided by 2 mL is 1.5 mg/mL, which is 1,500 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 15 mcg.

How many units is 250 mcg from a 3 mg vial with 2 mL?

250 mcg divided by 1,500 mcg/mL is 0.17 mL, which is 16.7 units on a U-100 syringe and 6.7 units on a U-40 syringe. The vial holds 12 draws of that size.

What if I add 2.5 mL instead of 2 mL to the 3 mg vial?

The mass stays 3 mg. With 2.5 mL the concentration is 1.2 mg/mL instead of 1.5 mg/mL, so the same amount per draw needs more units: 250 mcg becomes 20.8 units instead of 16.7.

Does a 3 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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