Body Measurements & Weight

Whether weight and waist are in a healthy range is understood not from one number but from reading several measures together. This page calculates common body measures, from the weight-to-height ratio to abdominal fat distribution.

Which tool for which question?

• BMR and Daily Calorie Needs Calculator: Calculate your basal metabolic rate (BMR) with the Mifflin-St Jeor equation and your daily calorie needs from your activity level, plus daily calories for a weight loss or gain goal.
• Waist-to-Hip Ratio Calculator (WHO Cut-offs): Calculate your waist-to-hip ratio from waist and hip circumference, compare it with the WHO cut-off and, if you enter your height, see your waist-to-height ratio.
• Ideal Weight Calculator (Devine, Robinson, Miller, Hamwi): Estimate your ideal body weight from height and sex with four classic formulas (Devine, Robinson, Miller, Hamwi), their average and the BMI-based healthy weight range.
• Body Mass Index (BMI) Calculator: Calculate your body mass index (BMI) from weight and height, see your WHO class, the healthy weight range for your height and how much weight separates you from it.
• Body Fat Percentage Calculator (US Navy Method): Estimate your body fat percentage from height, neck, waist and (for women) hip circumference with the US Navy (Hodgdon-Beckett) method, plus fat mass and lean mass.

How the calculation works

• Body mass index (BMI) = weight (kg) ÷ height² (m²); World Health Organization adult classes are read as underweight, normal, overweight and obese.
• Waist-to-hip ratio = waist circumference ÷ hip circumference; it shows abdominal fat and is assessed by sex-specific WHO thresholds.
• Ideal weight gives a reference weight from height and sex using four classic formulas (Devine, Robinson, Miller, Hamwi).
• Body fat is estimated from tape measurements with the US Navy method.
• Basal metabolic rate estimates the daily energy used at rest.

Things to watch

• BMI does not distinguish muscle mass, age or sex; it can mislead athletes and children.
• For waist-to-hip ratio, measuring in the morning, fasting and at the same points keeps results consistent.
• Different methods do not match exactly; look at the overall picture, not one number.

Results are estimates and do not replace medical advice, diagnosis or treatment; consult your doctor or dietitian for health decisions.