Tools

Two calculators that do the arithmetic people get wrong most. Both are free, run in your browser, and remember your last entry on this device. Neither gives dosing advice; they do sums on numbers you already have.

Reconstitution calculatorHow much bac water to add, and which line to draw to on a U-100 insulin syringe. Handles 0.3, 0.5 and 1 mL barrels.

Temperature-loss calculatorLeft a vial out, or a parcel sat in a hot van? Estimate how much potency is likely left and whether to keep it, use it soon, or replace it.

Coming next: a nasal-spray press counter. Ask for a tool on the about page and it goes on the list.