BMI Calculator
Check your Body Mass Index using WHO classifications. Free, instant, no data collected.
Healthy weight range for your height: 53.5 – 72.3 kg
Your BMI is in the healthy range. Maintain through balanced nutrition and activity.
BMI is calculated identically for all adults using the formula weight ÷ height². It does not directly measure body fat percentage, which naturally differs by sex, age, and ethnicity. Use BMI as a general screening reference, not a precise body composition analysis.
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BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or body composition. Always consult a healthcare provider.
About BMI
Body Mass Index (BMI) is calculated by dividing weight in kilograms by height in meters squared (kg/m²).
WHO BMI classifications:
| Category | WHO | Asia-Pacific | China / Japan |
|---|---|---|---|
| Severe Thinness | < 16.0 | < 16.0 | < 16.0 |
| Moderate Thinness | 16.0 – 17.0 | 16.0 – 17.0 | 16.0 – 17.0 |
| Mild Thinness | 17.0 – 18.5 | 17.0 – 18.5 | 17.0 – 18.5 |
| Normal (Healthy) | 18.5 – 25.0 | 18.5 – 23.0 | 18.5 – 24.0 |
| Overweight | 25.0 – 30.0 | 23.0 – 25.0 | 24.0 – 28.0 |
| Obese Class I | ≥ 30.0 | ≥ 25.0 | ≥ 28.0 |
| Obese Class II | ≥ 35.0 | ≥ 30.0 | ≥ 30.0 |
| Obese Class III | ≥ 40.0 | ≥ 40.0 | ≥ 40.0 |
BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, or body composition. Always consult a healthcare provider.
Frequently Asked Questions
What is BMI and how is it calculated? +
BMI (Body Mass Index) is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). It was developed by Belgian mathematician Adolphe Quetelet in the 1830s and adopted by the World Health Organization as a standard screening tool for weight categories.
Is BMI different for men and women? +
The BMI formula is identical for all adults. However, body composition differs — women naturally carry more essential body fat than men, and men tend to have more muscle mass. This means BMI may underestimate body fat in women and overestimate it in men with high muscle mass. That's why BMI is a screening tool, not a diagnostic measure.
Why do different regions have different BMI standards? +
Research shows that different ethnic groups have different body composition profiles at the same BMI. For example, Asian populations tend to have a higher percentage of body fat and higher risk of metabolic diseases at lower BMI values. This is why the WHO recommended an Asian-Pacific classification with lower overweight (≥23) and obesity (≥25) thresholds.
What are the limitations of BMI? +
BMI does not measure body fat directly. It cannot distinguish between muscle, fat, and bone mass. Athletes with high muscle mass may be classified as overweight or obese despite having low body fat. Older adults may have normal BMI but high body fat due to muscle loss. Pregnant women and children should use different assessment methods.
How can I reach a healthy BMI? +
For those above the healthy range, gradual weight loss of 0.5–1 kg (1–2 lbs) per week through a combination of balanced nutrition and regular physical activity is generally recommended. For those below, increasing calorie intake with nutrient-dense foods and strength training can help. Always consult a healthcare provider for personalized advice.