Health & Body

Calculate your Body Mass Index and see where you land on the WHO healthy-weight range. Metric or imperial, instant, free, no sign-up.

Calculate your basal metabolic rate with the Mifflin-St Jeor equation and preview your daily calorie needs by activity level. Metric or imperial, instant, free.

Estimate your body-fat percentage with the U.S. Navy circumference method and see your fitness category. Metric or imperial, instant, free, no sign-up.

Estimate how much caffeine is left in your body at bedtime and when it drops below the level that disrupts sleep. Free, instant, no sign-up.

Calculate your daily calorie needs (TDEE) and a balanced macro split for losing, maintaining or gaining weight. Mifflin-St Jeor, metric or imperial, free.

Estimate a daily water target from your body weight, exercise, and climate. Shown as an easy range in litres and cups. Free, instant, no sign-up.

Find your ideal body weight from four classic formulas plus the healthy BMI range for your height. Metric or imperial, instant, free, no sign-up.

Estimate your ovulation day and fertile window from your last period and cycle length, with your next three cycles projected. Free, instant — not a contraceptive method.

Estimate your due date from your last period, conception date or IVF transfer, and see your gestational age and trimester on a 40-week timeline. Free, instant.

Estimate a sensible daily protein range for your body weight and goal, plus how much to aim for per meal. Free, instant, no sign-up.

Estimate the sleep debt you have built up from short nights and how many recovery nights it takes to pay it back. Free, instant, no sign-up.