PeptideCalculations
3.333 mg/mL · 3,333 mcg/mL · 33.33 mcg per U-100 unit

5 mg vial + 1.5 mL bacteriostatic water

A 5 mg vial reconstituted with 1.5 mL comes to 3.333 mg/mL. Every unit on a U-100 insulin syringe then carries 33.33 mcg, so 250 mcg is 7.5 units (0.075 mL) and the vial holds 20 draws of that size.

Units for each amount

5 mg vial + 1.5 mL = 3.333 mg/mL (3,333 mcg/mL, 33.33 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.0151.50.6100
100 mcg0.0331.250
150 mcg0.0454.51.833
200 mcg0.0662.425
250 mcg0.0757.5320
300 mcg0.0993.616
400 mcg0.12124.812
500 mcg0.1515610
750 mcg0.2222.596
1 mg0.330125
1.5 mg0.4545183
2 mg0.660242
2.5 mg0.7575302
5 mg1.5150601

Same vial, other volumes

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

Watermg/mLmcg per unit250 mcg =
0.5 mL101002.5 unitstable →
1 mL5505 unitstable →
1.5 mL3.33333.337.5 units
2 mL2.52510 unitstable →
2.5 mL22012.5 unitstable →
3 mL1.66716.6715 unitstable →
5 mL11025 unitstable →

Same concentration, different vial

These pairs also come to 3.333 mg/mL, so their unit counts match this page exactly; only the number of draws per vial differs: 10 mg + 3 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

5 mg + 1.5 mL questions

What concentration is 5 mg in 1.5 mL?

5 mg divided by 1.5 mL is 3.333 mg/mL, which is 3,333 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 33.33 mcg.

How many units is 250 mcg from a 5 mg vial with 1.5 mL?

250 mcg divided by 3,333 mcg/mL is 0.075 mL, which is 7.5 units on a U-100 syringe and 3 units on a U-40 syringe. The vial holds 20 draws of that size.

What if I add 2 mL instead of 1.5 mL to the 5 mg vial?

The mass stays 5 mg. With 2 mL the concentration is 2.5 mg/mL instead of 3.333 mg/mL, so the same amount per draw needs more units: 250 mcg becomes 10 units instead of 7.5.

Does a 5 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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