⚖️ BMI Calculator
Calculate your Body Mass Index instantly. See your BMI category, healthy weight range, and a visual gauge.
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BMI Categories
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | Below 18.5 | Increased risk of nutritional deficiencies |
| Normal weight | 18.5 – 24.9 | Lowest health risk |
| Overweight | 25.0 – 29.9 | Moderate risk of health problems |
| Obese | 30.0 and above | High risk of health problems |
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Frequently Asked Questions
What is BMI and how is it calculated?
Body Mass Index (BMI) is a simple measure of body fat based on height and weight. It's calculated by dividing weight in kilograms by height in meters squared (kg/m²). For imperial units, the formula is (weight in pounds × 703) ÷ (height in inches)². BMI is used as a screening tool to identify potential weight-related health issues.
Is BMI an accurate measure of health?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletes with high muscle mass may have a high BMI while being perfectly healthy. It also doesn't account for body fat distribution, age, sex, or ethnicity. For a complete health assessment, combine BMI with waist circumference, body fat percentage, and other health markers.
What is a healthy BMI range?
A healthy BMI is generally between 18.5 and 24.9. Below 18.5 is considered underweight, 25–29.9 is overweight, and 30 or above is classified as obese. However, these ranges are guidelines — individual health depends on many factors including fitness level, muscle mass, and overall lifestyle.
Does BMI differ for men and women?
The BMI formula and standard categories are the same for adult men and women. However, women naturally tend to have more body fat than men at the same BMI. Some health organizations suggest that women may have a slightly higher healthy body fat range. For children and teens, BMI is interpreted using age- and sex-specific percentile charts.
How can I improve my BMI?
To reach a healthier BMI, focus on balanced nutrition and regular physical activity. Aim for 150+ minutes of moderate exercise weekly, eat a diet rich in whole foods, fruits, vegetables, lean protein, and whole grains. Avoid crash diets — sustainable lifestyle changes of 1–2 pounds per week are safer and more effective long-term. Consult a healthcare provider for personalized guidance.