BMI Calculator
Calculate your Body Mass Index (BMI) and check if your weight is in the healthy range.
Understanding Body Mass Index (BMI)
What is BMI?
Body Mass Index (BMI) is a numerical value calculated using your weight and height. It is widely used as a simple screening tool to categorize individuals as underweight, normal weight, overweight, or various degrees of obesity. BMI provides a reliable indicator of body fatness for most people and is used to screen for potential weight issues.
The formula for calculating BMI is: BMI = weight(kg) / height²(m²). For example, if you weigh 70 kg and your height is 1.75 meters, your BMI would be 70 ÷ (1.75)² = 22.9, which falls in the normal weight range.
BMI Categories
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Risk of nutritional deficiency and osteoporosis |
| 18.5 - 24.9 | Normal weight | Low risk (healthy range) |
| 25.0 - 29.9 | Overweight | Moderate risk of developing heart disease, high blood pressure, stroke, diabetes |
| 30.0 - 34.9 | Obesity Class 1 | High risk of developing heart disease, high blood pressure, stroke, diabetes |
| 35.0 - 39.9 | Obesity Class 2 | Very high risk of developing heart disease, high blood pressure, stroke, diabetes |
| 40.0 and above | Obesity Class 3 | Extremely high risk of developing heart disease, high blood pressure, stroke, diabetes |
Limitations of BMI
While BMI is a useful screening tool, it does have several limitations:
- BMI doesn't directly measure body fat and doesn't account for muscle mass, bone density, or overall body composition.
- Athletes and individuals with high muscle mass may be classified as overweight or obese despite having healthy body fat levels.
- Elderly people often have less muscle mass, which can underestimate their body fat content.
- BMI may not be accurate for pregnant or lactating women.
- Different ethnic groups may have different associations between BMI and health risks.
Tips for Maintaining a Healthy BMI
Balanced Diet
- Focus on fruits, vegetables, whole grains, and lean proteins
- Limit processed foods, sugars, and saturated fats
- Practice portion control and mindful eating
- Stay hydrated by drinking plenty of water
Regular Physical Activity
- Aim for at least 150 minutes of moderate aerobic activity weekly
- Include strength training exercises twice a week
- Find activities you enjoy to maintain consistency
- Reduce sedentary time by taking regular breaks from sitting
When to Consult a Healthcare Provider
It's advisable to consult with a healthcare provider in the following situations:
- If your BMI falls outside the healthy range (below 18.5 or above 25)
- If you've experienced significant unintentional weight loss or gain
- Before starting any new intensive diet or exercise program
- If you have existing health conditions like diabetes, heart disease, or high blood pressure
- For a more comprehensive assessment of your body composition and health status
Note: BMI is a screening tool, not a diagnostic of body fatness or health. It should be used as one of several factors in evaluating health status and risks. Always consult with healthcare professionals for medical advice, diagnosis, or treatment.