PeptideCalculations
8 mg/mL · 8,000 mcg/mL · 80 mcg per U-100 unit

20 mg vial + 2.5 mL bacteriostatic water

A 20 mg vial reconstituted with 2.5 mL comes to 8 mg/mL. Every unit on a U-100 insulin syringe then carries 80 mcg, so 500 mcg is 6.3 units (0.063 mL) and the vial holds 40 draws of that size.

Units for each amount

20 mg vial + 2.5 mL = 8 mg/mL (8,000 mcg/mL, 80 mcg per unit on U-100)
DosemLU-100 unitsU-40 unitsDoses per vial
50 mcg0.00630.630.25400
100 mcg0.0131.30.5200
150 mcg0.0191.90.75133
200 mcg0.0252.51100
250 mcg0.0313.11.380
300 mcg0.0383.81.566
400 mcg0.055250
500 mcg0.0636.32.540
750 mcg0.0949.43.826
1 mg0.1312.5520
1.5 mg0.1918.87.513
2 mg0.25251010
2.5 mg0.3131.312.58
5 mg0.6362.5254
10 mg1.25125502

Same vial, other volumes

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

Watermg/mLmcg per unit500 mcg =
0.5 mL404001.3 unitstable →
1 mL202002.5 unitstable →
1.5 mL13.333133.333.8 unitstable →
2 mL101005 unitstable →
2.5 mL8806.3 units
3 mL6.66766.677.5 unitstable →
5 mL44012.5 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

20 mg + 2.5 mL questions

What concentration is 20 mg in 2.5 mL?

20 mg divided by 2.5 mL is 8 mg/mL, which is 8,000 mcg/mL. On a U-100 syringe each unit holds 0.01 mL, so one unit carries 80 mcg.

How many units is 500 mcg from a 20 mg vial with 2.5 mL?

500 mcg divided by 8,000 mcg/mL is 0.063 mL, which is 6.3 units on a U-100 syringe and 2.5 units on a U-40 syringe. The vial holds 40 draws of that size.

What if I add 3 mL instead of 2.5 mL to the 20 mg vial?

The mass stays 20 mg. With 3 mL the concentration is 6.667 mg/mL instead of 8 mg/mL, so the same amount per draw needs more units: 500 mcg becomes 7.5 units instead of 6.3.

Does a 20 mg vial hold 2.5 mL?

Usually. Most lyophilized peptide vials are 2 mL or 3 mL glass, and 2.5 mL fits with room to swirl. Check the vial if it is an unusually small format.

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