Tools
Reconstitution calculator
Enter what is in the vial and what you are adding to it. You get the concentration, the unit to draw to on an insulin barrel, and how many draws the vial yields. Nothing is sent anywhere — the arithmetic runs in your browser.
Your vial
Standard vials take up to about 3 mL.
Your draw
Work backwards
Pick the unit you want to draw to and this returns the water volume that puts your dose there.
Add 4 mL
Results
Draw to
5units
0.05 mL on a U-100 · 1 mL barrel
Concentration
5 mg/mL
5,000 mcg per mL
Per unit
50 mcg
One unit on this barrel
Draws per vial
40
10,000 mcg total in the vial
Per draw
250 mcg
0.25 mg
- Units are volume, not potency — one unit on this barrel is 1/100 mL of whatever is in the vial, so every number here moves the moment the water volume does.
Method
Three lines of arithmetic
Step 1
Concentration
mg in vial ÷ mL of water = mg per mL
10 mg into 2 mL is 5 mg/mL — 5,000 mcg in every millilitre.
Step 2
Value of one unit
mcg per mL ÷ units per mL = mcg per unit
At 5,000 mcg/mL, a U-100 barrel carries 50 mcg behind each of its 100 units.
Step 3
The draw
amount per draw ÷ mcg per unit = units
250 mcg at 50 mcg per unit is 5 units, which is 0.05 mL.
Quick conversions
- 1 mg
- = 1,000 mcg
- 1 mL
- = 100 units (U-100)
- 1 unit
- = 0.01 mL (U-100)
- 1 mL
- = 40 units (U-40)
Questions
Reconstitution, answered
For research use only · Not for human consumption