Fitness

Fitness

Fitness progress starts with knowing your numbers, and these calculators give you the three that matter most. Estimate your body mass index and see where it falls within the World Health Organization categories, work out how many calories your body needs each day using the Mifflin-St Jeor equation with your activity level and goal factored in, and approximate your body-fat percentage with the U.S. Navy circumference method that requires nothing more than a tape measure. Each tool states its formula openly and labels its output as an estimate: these are screening measures that help you set targets and track direction, not clinical diagnoses. Use them together — BMI for a quick weight-to-height snapshot, calories for planning intake, and body fat for a picture that muscle alone cannot distort — and re-check every few weeks to see which way the trend is moving.