Tools

Calculators and converters

Each one shows its formula, says who it is for, and states what it cannot tell you. Nothing you type leaves the page.

Body mass indexRelates weight to height. A screening measure, not a diagnosis.

Blood test unit converterGlucose, cholesterol, triglycerides and creatinine between mg/dL and SI units.

Dose unit converterMicrograms, milligrams, grams, millilitres, teaspoons and household measures.

Body surface areaThe figure many specialist doses are calculated from.

Ideal body weight (Devine)A 1974 formula used in dose calculation — not a target weight.

Pregnancy due dateAn estimate from the first day of the last period.

Dose calculators, renal adjustment, paediatric dosing and opioid conversion are deliberately absent. Those produce a number someone administers; they need validation against their source and a clinician’s sign-off, which is a separate piece of work rather than a longer list here.