All Body Calculators & Guides

Calculate your Body Mass Index with age and gender-specific standards

Estimate ideal body weight using Devine and Hamwi formulas

Plan a safe calorie deficit and timeline to reach your goal weight

Plan a lean calorie surplus and timeline to reach your goal weight

Compare your BMI under CDC and WHO Asian-population thresholds side by side

Find the weight range that matches a healthy BMI (18.5–24.9) for your height

See how the healthy BMI range shifts across children, adults, and seniors

Estimate body fat percentage using the US Navy circumference method

Measure Fat-Free Mass Index for athletes and lifters

Calculate lean body mass using the Boer formula

Calculate BSA using the Mosteller formula (medical dosing)

Calculate your Basal Metabolic Rate (Mifflin-St Jeor equation)

Compute Total Daily Energy Expenditure from BMR and activity level

Evaluate body shape and cardiovascular health risks (WHO standard)

Assess cardiometabolic risk with the "keep waist < half height" rule

Check your 2026 WHtR screen and estimate body fat vs Army/Navy/AF/Marine/Coast Guard ceilings

Estimate daily hydration needs from body weight and activity level

Find your ideal bedtime or wake time using 90-minute sleep cycles