Free tools
One question each. No signup, nothing to install.
Each tool answers a single question from the numbers you type. They run in your browser on the same calculation code the VialMath app ships, so a tool and the app can never disagree. Nothing you enter is sent anywhere.
Tools
Reconstitution calculator
What's my draw volume? Vial size, water added and target dose → concentration in mg/mL and the draw in U-100 syringe units. Or enter the units and get the dose back.
Open the calculator →How long will a vial last?
How many doses are in this vial, and how many days is that? Vial size, dose and interval → doses per vial and days per vial, counted the way the app counts them.
Open vial burn →When does a vial run out?
What date does this vial run out, and when should I reorder? What's left, dose and interval → a projected run-out date, and a reorder-by date if you add a lead time.
Open run-out date →The difference
A calculator gives you this number once.
VialMath keeps it honest every time an input changes — draw volume, what's due today, doses remaining, run-out and reorder-by, all recomputed together on your own device. Free for up to 2 compounds. No card, no account, no trial clock.