PeptideCalculations
1 mg/mL · 1,000 mcg/mL · 10 mcg per U-100 unit

1 mg vial + 1 mL bacteriostatic water

A 1 mg vial reconstituted with 1 mL comes to 1 mg/mL. Every unit on a U-100 insulin syringe then carries 10 mcg, so 100 mcg is 10 units (0.1 mL) and the vial holds 10 draws of that size.

Units for each amount

1 mg vial + 1 mL = 1 mg/mL (1,000 mcg/mL, 10 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.055220
100 mcg0.110410
150 mcg0.151566
200 mcg0.22085
250 mcg0.2525104
300 mcg0.330123
400 mcg0.440162
500 mcg0.550202
750 mcg0.7575301
1 mg1100401

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 units
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 1 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 2 mg + 2 mL, 3 mg + 3 mL, 5 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 + 1 mL questions

What concentration is 1 mg in 1 mL?

1 mg divided by 1 mL is 1 mg/mL, which is 1,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 10 mcg.

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

100 mcg divided by 1,000 mcg/mL is 0.1 mL, which is 10 units on a U-100 syringe and 4 units on a U-40 syringe. The vial holds 10 draws of that size.

What if I add 1.5 mL instead of 1 mL to the 1 mg vial?

The mass stays 1 mg. With 1.5 mL the concentration is 0.667 mg/mL instead of 1 mg/mL, so the same amount per draw needs more units: 100 mcg becomes 15 units instead of 10.

Does a 1 mg vial hold 1 mL?

Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 1 mL fits with room to swirl. Check the vial if it is an unusually small format.

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