Reconstitution calculator that gets the units right

Why "just use 30 units" is wrong

Syringe "units" are a volume marking — on a U-100 syringe, 100 units = 1 mL. They say nothing about how much drug you're drawing until you know the concentration, and the concentration depends entirely on how the vial was reconstituted (mg of powder ÷ mL of bac water). The same "30 units" can be a wildly different mg dose from one mix to the next. This calculator converts mg ↔ mL ↔ units correctly, both directions.

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This tool converts the numbers you enter — it never recommends a dose. Its constants are cited below; the warnings are arithmetic checks, not clinical limits.

• Syringe "units" are a volume marking, not a drug amount: a U-100 syringe reads 100 units = 1 mL (U-40 = 40 units/mL). The calculator converts mg ↔ mL ↔ units on this standard — it never assumes units equal mg.Standard insulin concentration, U-100 = 100 units/mL (PMC5505430) ↗
• The volume to draw is (drug ordered ÷ drug available) × the vial's total mL — i.e. dose ÷ concentration, where concentration (mg/mL) = vial mg ÷ bacteriostatic water mL. You enter every number; the tool only does this arithmetic.Dose-volume formula — StatPearls "Dose Calculation" (Bookshelf NBK430836) ↗
• An opened (punctured) multi-dose vial is dated and discarded within 28 days unless the manufacturer states otherwise.CDC Injection Safety (per USP General Chapter <797>) ↗