Free tool · no signup

Reconstitution calculator

Enter a vial size, the water you added, and a target dose. Get concentration and draw volume back — in mL and in U-100 insulin-syringe units. Nothing to install, no account, no compound list to pick from.

This calculator performs calculations on numbers you enter. It contains no medical information and provides no guidance. It does not supply, suggest, rank, or evaluate any compound, dose, or range — and it never will. Not a medical device. Consult a licensed professional for any medical decision.

Enter your numbers

Vial size (mg)

Bacteriostatic water added (mL)

Desired dose

Dose unit

Clear all fields

Result

Draw volume

—

U-100 insulin-syringe units

Concentration —

Draw volume —

Want the whole protocol tracked?

This calculator does one thing. VialMath, the app, does the rest — cycles and phases, vial burn-rate and reorder timing, a decision log for gate checks, and retroactive logging for the day you forget. Same math you just used, applied to a full protocol.

$24 once. No subscription, ever.
No account. Runs on your device.

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