Screening & Risk
Every screening & risk calculator on CalcEngines — each with its formula, a worked example, the standard it follows and the assumptions it makes.
3 calculators in this section
- Alcohol Units Calculator (UK Units, US Drinks, Grams)How much pure ethanol is in a drink, and what that same amount is called in four different places — because a UK unit is 10 mL of ethanol, about 8 g, a US standard drink is 14 g, an Australian standard drink is 10 g and a Canadian one is 13.45 g, so the same glass is 3.25 of one thing and 1.8 of another. Grams of ethanol is the headline because it is the only figure the conventions agree on. Published weekly figures are quoted with the body and the date that published them. Nothing here is presented as a safe amount, and the page deliberately does not compute how much you have left.
- Blood Pressure Category Calculator (Adults, 3 Guidelines)Where one adult blood pressure reading falls on the 2025 AHA/ACC criteria, the 2024 ESC criteria and the 2023 ESH criteria at the same time — shown side by side rather than resolved, because a systolic of 130 to 139 is stage 1 hypertension in the United States and is not hypertension at all in Europe, and a reader told only one of those answers has been told the least useful half of the truth. Classified on the worse of the two readings, as all three documents instruct. One reading taken once is not a diagnosis of anything; a reading at or above 180 systolic or 120 diastolic is the one figure here worth acting on today.
- Smoking Pack-Years Calculator (Cigarettes a Day, Two Periods)Pack-years from cigarettes a day and years smoked — taking cigarettes rather than packs, because that is how people count, and taking two periods and a quit date, because consumption changes and years since quitting is part of the screening criteria that most calculators omit. The arithmetic is one multiplication; the value of the page is in what the figure is used for, which is principally eligibility for lung cancer screening, and in what a single product of two numbers cannot see. No grading, no colour, no admonishment: the number and its uses, with the sources named.