Guides

Short, friendly explainers on the math behind the calculator. They're educational only, so always follow your prescriber and pharmacist.

How reconstitution math works

A plain-English walkthrough of reconstitution math: concentration = mg ÷ mL, volume = dose ÷ concentration, and units on a U-100 syringe.

Reading a U-100 syringe

U-100 means 100 units per mL. Learn how 30, 50, and 100-unit syringes are marked and how to convert units to mL.

Multi-dose vials: turning mg into syringe units

If your prescribed dose is in mg but your syringe is marked in units, here's the math using the concentration on your pharmacy label.

Not medical advice. This tool does arithmetic on numbers you enter. It does not recommend doses. Confirm with your prescriber or pharmacist. 18+ only.