Standard U-100 Concentration Reference Table
On any standard U-100 insulin syringe, 1.0 mL equals 100 units (1 unit = 0.01 mL). Use this quick-reference chart to verify common vial and diluent combinations:
| Vial Mass | BAC Water Added | Concentration (mcg/unit) | 250 mcg Aliquot | 500 mcg Aliquot | 1.0 mg (1,000 mcg) |
|---|---|---|---|---|---|
| 2 mg (2,000 mcg) | 1.0 mL (100u) | 20 mcg / unit | 12.5 units | 25 units | 50 units |
| 5 mg (5,000 mcg) | 1.0 mL (100u) | 50 mcg / unit | 5 units | 10 units | 20 units |
| 5 mg (5,000 mcg) | 2.0 mL (200u) | 25 mcg / unit | 10 units | 20 units | 40 units |
| 10 mg (10,000 mcg) | 1.0 mL (100u) | 100 mcg / unit | 2.5 units | 5 units | 10 units |
| 10 mg (10,000 mcg) | 2.0 mL (200u) | 50 mcg / unit | 5 units | 10 units | 20 units |
| 15 mg (15,000 mcg) | 3.0 mL (300u) | 50 mcg / unit | 5 units | 10 units | 20 units |
Frequently Asked Questions
How does the peptide reconstitution calculator convert mg and mL into U-100 syringe units?
First, it converts vial mass from milligrams to micrograms (1 mg = 1,000 mcg). Next, it converts the volume of bacteriostatic water from milliliters to U-100 insulin syringe units (1 mL = 100 units). Dividing total micrograms by total syringe units gives the concentration in mcg per unit. Dividing the target aliquot (mcg) by that concentration yields the exact number of U-100 units.
How many units on a U-100 syringe is 250 mcg from a 5 mg vial with 2 mL of BAC water?
A 5 mg vial contains 5,000 mcg. Adding 2 mL (200 U-100 units) of bacteriostatic water creates a concentration of 25 mcg per unit. To measure 250 mcg, 250 ÷ 25 = 10 units on a U-100 syringe (0.10 mL).
What is the difference between a 0.3 mL (30-unit), 0.5 mL (50-unit), and 1.0 mL (100-unit) U-100 syringe?
All three U-100 syringes use the exact same unit concentration scale (1 unit = 0.01 mL). A 10-unit measurement is 0.10 mL on a 30-unit, 50-unit, or 100-unit U-100 syringe. Smaller barrels (0.3 mL / 30-unit) simply space the markings farther apart, making 2-to-15 unit measurements easier to read accurately.
Does adding more bacteriostatic water change the total amount of peptide in the vial?
No. Adding 2 mL instead of 1 mL of bacteriostatic water cuts the concentration per unit in half (requiring twice as many syringe units for the same microgram aliquot), while the total mass of peptide in the vial and the total number of aliquots per vial remain unchanged.
Mathematical Scope & Medical Disclaimer
This calculator is a strictly mathematical unit-conversion utility (mg + mL → mcg/unit). It does not calculate, verify, or recommend human doses, and has no medical foundation. Need step-by-step sterile handling and cold-storage instructions? Read our Complete Peptide Reconstitution Guide →