What is BMI?
BMI (Body Mass Index) is a simple calculation that estimates body fat based on your height and weight. It helps categorize individuals into weight classes—underweight, normal weight, overweight, and obese—providing a general assessment of health risks related to weight.
While BMI doesn’t directly measure body fat, it’s a useful screening tool for most adults (18+ years). However, it may not account for muscle mass, bone density, or other individual factors.
How to Calculate BMI
You can calculate your BMI using this simple formula:
BMI = Weight (kg) / (Height (m))²
Example:
- Weight = 70 kg
- Height = 1.75 m
- BMI = 70 / (1.75 × 1.75) = 22.9 (Normal weight)
Use Our BMI Calculator
For quick results, try our easy-to-use BMI calculator above! Just enter your height and weight, and get instant feedback.
BMI Chart & Categories
Here’s the standard BMI classification for adults (WHO guidelines):
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Increased risk of malnutrition, osteoporosis |
| 18.5 – 24.9 | Normal weight | Lowest health risk |
| 25.0 – 29.9 | Overweight | Moderate risk of heart disease, diabetes |
| 30.0 – 34.9 | Obese (Class I) | High risk of metabolic disorders |
| 35.0 – 39.9 | Obese (Class II) | Very high risk |
| 40.0 & above | Obese (Class III) | Severe health risks |
Why BMI Matters for Your Health
- Underweight? You may lack essential nutrients, leading to weakened immunity and bone health.
- Normal weight? Keep up healthy habits with balanced nutrition and exercise.
- Overweight/Obese? Higher risk of heart disease, diabetes, and joint problems.
Note: BMI is a screening tool, not a diagnostic measure. Athletes with high muscle mass may have a high BMI without excess fat. Always consult a doctor for personalized advice.
How to Improve Your BMI
If Underweight:
- Eat calorie-dense foods (nuts, avocados, whole grains)
- Strength training to build muscle
If Overweight/Obese:
- Increase physical activity (walking, cycling, strength training)
- Reduce processed foods & sugary drinks
- Portion control & balanced meals (protein, fiber, healthy fats)
Final Thoughts
Knowing your BMI helps assess potential health risks, but it’s just one indicator. Pair it with other health metrics (waist circumference, body fat percentage) for a complete picture.
Try our BMI calculator now and take the first step toward better health!
FAQ
Q: Is BMI accurate for athletes?
A: BMI may overestimate body fat in muscular individuals. Additional measurements (body fat %) are better.
Q: Does BMI apply to children?
A: No, pediatric growth charts are used instead.
Q: What’s a healthy BMI for seniors?
A: Slightly higher BMI (24–27) may be better for older adults to prevent frailty.
Q: Can BMI be wrong for short/tall people?
A: It may slightly overestimate/underestimate, but it’s still a useful guideline.