BMI Calculator
Your BMI Result
Your BMI is: 0
BMI Categories
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 - 24.9 | Normal weight |
| 25.0 - 29.9 | Overweight |
| 30.0 and above | Obese |
Understanding BMI: Your Complete Guide to Body Mass Index
What is BMI?
BMI (Body Mass Index) is a numerical value calculated from your weight and height that provides a reliable indicator of body fatness for most people. It is used to screen for weight categories that may lead to health problems. Our free BMI calculator helps you determine your BMI quickly and accurately.
Why is BMI Important?
Maintaining a healthy BMI is crucial for overall health and well-being. Research shows that:
- People with BMI below 18.5 (underweight) may have nutritional deficiencies and weakened immune systems
- Those with BMI between 18.5-24.9 (normal weight) have the lowest risk of weight-related health problems
- Individuals with BMI 25-29.9 (overweight) are at increased risk for conditions like type 2 diabetes and high blood pressure
- People with BMI 30+ (obese) face significantly higher risks for serious health conditions including heart disease and stroke
How to Calculate BMI
BMI is calculated the same way for both adults and children using one of these methods:
Metric Formula: BMI = weight (kg) / [height (m)]²
Imperial Formula: BMI = 703 × weight (lbs) / [height (in)]²
Our calculator does all the math for you - just enter your measurements and get instant results!
BMI Limitations
While BMI is a useful screening tool, it has some limitations:
- May overestimate body fat in athletes and others with muscular builds
- May underestimate body fat in older persons and others who have lost muscle mass
- Doesn't directly measure body fat or account for fat distribution
For a more complete health assessment, consider combining BMI with other measurements like waist circumference and body fat percentage.
Tips for Maintaining a Healthy BMI
If your BMI indicates you're outside the healthy range, consider these evidence-based strategies:
- For underweight individuals: Focus on nutrient-dense foods, strength training, and consult a dietitian if needed
- For overweight/obese individuals: Combine healthy eating with regular physical activity (150+ minutes per week of moderate exercise)
- For everyone: Prioritize whole foods, limit processed foods and added sugars, stay hydrated, and get adequate sleep
Frequently Asked Questions
Q: Is BMI accurate for everyone?
A: BMI is generally accurate for most adults but may be less accurate for athletes, pregnant women, and the elderly.
Q: What's a healthy BMI for children?
A: Children's BMI is interpreted differently using age and sex-specific percentiles rather than fixed categories.
Q: How often should I check my BMI?
A: For most adults, checking every 3-6 months is sufficient unless you're actively trying to change your weight.
Use our free BMI calculator regularly to track your progress toward health goals. Remember that while BMI is an important health indicator, it's just one piece of your overall health picture.
