Health calculators

Screening tools, body metrics, and calorie math you can trust.

BMI, body fat, BMR, and other health screening tools — clearly labelled as informational rather than diagnostic, with citations for each formula.

Calculators
277
Topics: All Body Metrics (56) Calories (14)
277 results
Health / Body Metrics

Drug Loading Dose Calculator

Compute the loading dose required to immediately reach a target steady-state plasma concentration, given the apparent vo...

basic
21,527 4.5 1 min
Health / Body Metrics

Nadler Blood Volume Calculator

Estimate the total blood volume in litres for an adult using the Nadler formula, which uses height (in metres) and body...

basic
19,715 4.7 1 min
Health

A-a Gradient Calculator

Compute the alveolar–arterial oxygen gradient (PA-aO₂) using the alveolar gas equation: PAO₂ = FiO₂ · (Patm − 47) − PaCO...

basic
14,516 4.2 1 min
Health

QTc Fridericia Calculator

Compute the rate-corrected QT interval using Fridericia's cube-root formula: QTc = QT / RR^(1/3). Preferred over Bazett...

basic
20,556 4.9 1 min