Free web tool
Reconstitution calculator
Work out the concentration of a vial you mixed and how much to draw for the dose your prescriber gave you, shown on your syringe. Nothing you type leaves this page.
Result
Fill in the powder, the water and the dose. The result appears here.
Draw—
- —Concentration
- —
- —Doses in the vial
Enter in Doselight
Doselight doesn't calculate: type the dose and the draw into the app yourself.
How it's worked out
Good to know
- Nothing you type is sent anywhere or saved: no cookies, no tracking.
- On a U‑100 insulin syringe, 100 units = 1 mL, so 1 unit = 0.01 mL.
- Tuberculin and 3 mL syringes are read in mL, not units.