โ๏ธ BMI Calculator (Body Mass Index)
Enter your height and weight to calculate your BMI. Find out if you're in a healthy weight range according to WHO and CDC standards.
๐ What Is BMI?
BMI (Body Mass Index) is a simple screening tool that estimates body fat based on height and weight. It's used worldwide to categorize weight status and assess potential health risks.
๐ The Formula
For pounds/inches: BMI = weight (lbs) รท height (in)ยฒ ร 703
๐ WHO / CDC Classification
| BMI Range | Category | Health Risk |
|---|---|---|
| < 18.5 | Underweight | Possible nutritional deficiency, weakened immunity |
| 18.5 โ 24.9 | Normal Weight โ | Lowest health risk |
| 25.0 โ 29.9 | Overweight | Increased risk of cardiovascular issues |
| 30.0 โ 34.9 | Obese Class I | High risk |
| 35.0 โ 39.9 | Obese Class II | Very high risk |
| โฅ 40.0 | Obese Class III | Extremely high risk |
โ ๏ธ Limitations of BMI
- Doesn't distinguish muscle from fat: Athletes with high muscle mass may be classified as "overweight" despite having very low body fat.
- Doesn't account for fat distribution: Belly fat (visceral fat) is more dangerous than fat stored elsewhere.
- Not applicable to everyone: Children, pregnant women, and the elderly require different assessment methods.
โ FAQ
Is BMI accurate for everyone?
No. BMI doesn't account for body composition. A muscular athlete might have a BMI of 27 (overweight) but very low body fat. For a more complete picture, combine BMI with waist circumference and body fat percentage measurements.
What's a healthy BMI?
According to the WHO and CDC, a BMI between 18.5 and 24.9 is considered healthy for most adults. However, some studies suggest that a slightly higher BMI (23-27) may be associated with the lowest mortality risk in older adults.
How do I lower my BMI?
BMI changes through weight loss or gain. Sustainable weight loss involves a calorie deficit of 300-500 calories/day, which typically leads to losing 1-2 lbs per week. Combine diet with both cardio and strength training.
What's a better measure than BMI?
Waist-to-height ratio is increasingly recommended by health professionals. Your waist circumference should be less than half your height. Waist circumference alone is also useful: aim for under 40 inches (men) or 35 inches (women).