Health Calculators

BMI, calories, pregnancy due dates, and body composition estimates for personal insight.

These calculators give quick personal estimates for body metrics, energy needs, and pregnancy timing — always alongside professional care when it matters.

Health-related calculators summarize common clinical screening formulas (such as BMI or Mifflin–St Jeor calorie estimates) so you can see a number quickly. They are educational and are not a diagnosis, treatment plan, or substitute for a clinician.

Inputs like height, weight, age, and activity level change the result. Measure consistently, and read the limitations on each calculator page — especially if you are pregnant, under medical care, or using results to change diet or exercise.

Browse the tools below, then open any calculator for step-by-step guidance, the formula used, and a short example you can follow.

BMI in particular is easy to over-read; our BMI limitations guide explains when the number is a weak fit (athletes, older adults, pregnancy, and more).