Health & Fitness

Understand health, nutrition, training and sports measurements.

Body Metrics & Nutrition

BMR & TDEE CalculatorSee how many calories your body burns at rest and over the whole day, from your weight, height, age and activity.

Clinical Formulas & Health Reference

Pediatric Dose Unit ConverterConvert a dose that a clinician already set between mcg, mg, g, mL and more — with every step of the math shown.

Reproductive & Cycle Health

Pregnancy Due Date CalculatorEstimate your due date from your last period, a conception date, an IVF transfer or an ultrasound — with the formula and every step shown.

Sleep & Recovery Planning

Sleep Cycle CalculatorTime your night around complete 90-minute sleep cycles, so the alarm catches you in light sleep instead of deep sleep.

Fitness, Training & Performance

VO₂ Max CalculatorTurn a Cooper 12-minute run or Rockport 1-mile walk into a VO₂ max estimate, with the formula, working and study range in view.

Health Screening Reference

PHQ-2 Depression ScreeningAnswer the two public PHQ-2 questions for the past two weeks, total the 0–6 score and read what the common follow-up threshold does — and does not — mean.

Public Health & Epidemiology

Incidence & Prevalence CalculatorTurn case counts and populations into cumulative incidence, person-time incidence rate and point prevalence — with the denominator behind every measure in plain view.