How this calculator works
Reverse mode starts with a scale marking rather than a target mass. First it converts U-100 units to mL, then multiplies that volume by your calculated concentration. A marking of zero is valid and corresponds to zero volume and mass.
Formula
Volume in mL = U-100 units ÷ 100. Equivalent mass = volume × concentration.
Arithmetic example — not a recommendation
Arithmetic example only: with 5 mg in 2 mL, concentration is 2,500 mcg/mL. A marking of 10 U-100 units represents 0.1 mL, which corresponds to 250 mcg or 0.25 mg.
Scope and assumptions
This mode interprets U-100 markings only. It does not identify an actual syringe, check its capacity or infer scale accuracy. A marking does not represent a universal mass.
Mass is normalized to mcg; volume stays in mL. Where shown, U-100 means 100 scale units per mL. Read all formulas and precision rules.