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Body Mass Index (BMI) is a simple measure that uses your height and weight to estimate if your weight is healthy. It's calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). BMI is widely used by healthcare professionals as a screening tool for weight categories.
BMI is calculated using the formula: BMI = weight (kg) / height² (m²). For example, if you weigh 70 kg and are 1.75 m tall: BMI = 70 / (1.75 × 1.75) = 22.9. Our calculator does this math instantly for you in both metric and imperial units.
A BMI between 18.5 and 24.9 is considered normal or healthy weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is considered obese. These categories are defined by the World Health Organization (WHO).
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletes may have a high BMI despite being healthy. It also doesn't account for age, sex, ethnicity, or fat distribution. For a complete health assessment, consult a healthcare professional.
The BMI formula and categories are the same for adult men and women. However, women typically have more body fat than men at the same BMI. For more accurate body composition assessment, other methods like body fat percentage may be more informative.
BMI may not be accurate for athletes and muscular individuals. Since muscle weighs more than fat, a muscular person may have a high BMI while having low body fat. Athletes should consider body fat percentage measurements for more accurate assessment.
Your BMI indicates which weight category you fall into: Underweight (BMI < 18.5) may indicate malnutrition. Normal (18.5-24.9) suggests healthy weight. Overweight (25-29.9) indicates increased health risks. Obese (≥30) indicates significantly increased health risks.
A healthy weight is one that gives you a BMI between 18.5 and 24.9. Our calculator shows you the healthy weight range for your specific height. For example, for someone 170 cm tall, a healthy weight range is approximately 53-72 kg.
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