Reconstitution calculator

You set the dose. DosedWise works out the draw and shows it on a labelled syringe. It is free, needs no account, and never tells you what to take.

Compound (optional, name only)

Amount in vial

Water added

Your dose

Syringe

Enter the amount in the vial.

Enter how much water you are adding.

Enter your dose.

Your draw appears here as you type.

Math only. You set the dose. Not medical advice. Double-check before you inject.

How the math works

Concentration is the amount in the vial divided by the water you added. The draw volume is your dose divided by that concentration. On a U-100 syringe, 100 units are 1 mL, so a volume in mL becomes units by multiplying by 100. The number of doses in the vial is the vial amount divided by your dose, and adding more water never changes it.

DosedWise runs this in decimal arithmetic rather than binary floating point, so values like 0.1 mL are exact. It rounds the draw to a mark you can actually pull to, never the dose, and it always shows you what each neighbouring mark would deliver.