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BMI Calculator
Calculate your Body Mass Index to determine ideal weight.
What is Body Mass Index (BMI)?
Body Mass Index (BMI) is a measure used to assess whether a person's weight is healthy relative to their height. It is calculated by dividing weight in kilograms by the square of height in meters.
BMI Categories:
- Less than 18.5 — Underweight
- 18.5 - 24.9 — Normal weight (Healthy)
- 25 - 29.9 — Overweight
- 30 or more — Obese
Note: BMI is an approximate measure and does not take into account factors such as muscle mass or fat distribution.
How to Use
1
Enter your weight in kilograms.
2
Enter your height in centimeters.
3
Click 'Calculate' to see your BMI with health insights.
Enter Data
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About This Tool
What Is BMI?
Body Mass Index (BMI) is a numerical value derived from a person's weight and height. It provides a quick assessment of whether a person falls within a healthy weight range. BMI is widely used by healthcare professionals as a screening tool, though it should be supplemented with other assessments for a complete health picture.
How Is BMI Calculated?
BMI = weight (kg) ÷ height (m)². For example: a person weighing 70 kg with a height of 175 cm: BMI = 70 ÷ (1.75)² = 70 ÷ 3.0625 = 22.86. The result is then compared against WHO categories: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (≥30).
BMI Categories Explained
Underweight (<18.5): May indicate malnutrition or underlying health issues. Normal (18.5-24.9): Associated with the lowest health risks. Overweight (25-29.9): Slightly increased risk of cardiovascular disease and diabetes. Obese (≥30): Significantly higher risk of health complications including heart disease, type 2 diabetes, and joint problems.
Limitations of BMI
BMI does not distinguish between muscle mass and fat mass — so athletes may have a high BMI despite being healthy. It also doesn't account for age, gender, bone density, or body fat distribution. Waist circumference and body fat percentage tests provide a more complete picture. Always consult a healthcare professional for personalized advice.
Tip: BMI is a screening tool, not a diagnostic tool. Two people with the same BMI can have very different health profiles depending on lifestyle and body composition.
Sources & References
- Wikipedia: Body Mass Index — Comprehensive information about BMI, its history, and calculation methods
- WHO: Obesity and Overweight — World Health Organization facts about obesity and overweight
Frequently Asked Questions
Not necessarily. Athletes and people with high muscle mass may have a high BMI but are perfectly healthy. BMI doesn't distinguish between muscle and fat. Consider body fat percentage for a more accurate assessment.
Yes. For children and teens (ages 2-20), BMI is evaluated using age and gender-specific percentile charts rather than fixed categories, because body composition changes significantly during growth.
The ideal BMI range is 18.5-24.9 according to WHO guidelines. Within this range, health risks related to weight are lowest. However, individual health depends on many more factors than BMI alone.
BMI is a good population-level screening tool but has individual limitations. It doesn't account for muscle mass, bone density, age, or ethnicity. For personal health assessment, combine BMI with waist circumference, body fat percentage, and regular medical checkups.
Yes. Aim for gradual weight loss (0.5-1 kg per week) through a balanced diet and regular exercise. Crash diets can be harmful. Consult a healthcare provider before starting any weight loss program.
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