Tools

The calculators and readers that do the work 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.

Amazon listing translatorPaste a title like "31G 5/16 0.3cc U-100 Luer Lock" and get every number explained, then the matching products.

Compare productsTwo to four products side by side with every specification explained and the differences marked.

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