Body · Nutrition · Pregnancy
Health calculators that show their working
Most health calculators hand you a number and hide the formula behind it. These name the equation, state what it assumes, and say where it stops being reliable — because a BMI on a bodybuilder and a due date on a 35-day cycle are both wrong for reasons worth knowing.
Body
What the tape and the scale can tell you, and where each measure stops being honest.
Nutrition
How much you burn, how much protein you actually need, and how to split the rest.
Calories & TDEE
BMR across three formulas, daily burn, and calorie targets for losing, holding or gaining.
Protein
Daily protein by goal, computed on lean mass where the evidence says it should be.
Macros
Split a calorie target into protein, carbs and fat across seven diet patterns.
Water intake
Daily fluid from body weight, training load and climate — total and from drinks alone.
Pregnancy
Dating, milestones and weight gain — with the cycle-length assumption made explicit.