⚖️ BMI Calculator
Calculate your Body Mass Index to find out if you are underweight, healthy, overweight, or obese.
⚖️ BMI Calculator
📊 Your BMI Result
BMI Classification
| BMI Range | Category | Health Risk |
|---|---|---|
| < 18.5 | 🔵 Underweight | Low (other risks) |
| 18.5 – 24.9 | 🟢 Normal Weight | Minimal |
| 25.0 – 29.9 | 🟡 Overweight | Moderate |
| 30.0 – 34.9 | 🔴 Obese Class I | High |
| 35.0 – 39.9 | 🔴 Obese Class II | Very High |
| ≥ 40.0 | 🔴 Obese Class III | Extremely High |
BMI Calculator – Understanding Your Body Mass Index
Body Mass Index (BMI) is a widely used measure of body fat based on height and weight. It helps assess whether a person falls into a healthy weight range and is used by healthcare professionals as a screening tool for potential health risks.
BMI Formula
Imperial: BMI = 703 × Weight (lb) / Height² (inches²)
Example Calculation
For a person weighing 70 kg with a height of 175 cm (1.75 m):
- BMI = 70 / (1.75 × 1.75) = 70 / 3.0625 = 22.86
- Category: Normal Weight ✅
Limitations of BMI
While BMI is a useful screening tool, it has important limitations:
- Doesn't differentiate between muscle mass and fat (athletes may have high BMI but low body fat)
- Doesn't account for fat distribution (waist-to-hip ratio may be more accurate)
- Age and ethnicity can affect interpretation
- Not suitable for children (use BMI-for-age percentiles), pregnant women, or elderly
Beyond BMI – Other Health Metrics
- Waist Circumference: <80 cm (women), <94 cm (men) is healthy
- Waist-to-Hip Ratio: <0.85 (women), <0.90 (men)
- Body Fat Percentage: More accurate but requires special equipment
⚠️ Disclaimer: BMI is a general indicator, not a diagnostic tool. Always consult a qualified healthcare professional for personalized medical advice.
Frequently Asked Questions
According to WHO, a BMI between 18.5 and 24.9 is considered "Normal Weight" and associated with the lowest health risks. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese.
Simply select "Imperial" mode and enter your weight in pounds. The calculator automatically handles the conversion. For reference: 1 lb = 0.453592 kg.
Not always. Muscle is denser than fat, so athletes and bodybuilders may have a high BMI despite having very low body fat. In such cases, body fat percentage measurements are more accurate.
The healthy BMI range (18.5–24.9) translates to an ideal weight range. For a 175 cm person: Minimum = 18.5 × (1.75²) = 56.6 kg, Maximum = 24.9 × (1.75²) = 76.2 kg. Our calculator shows this range automatically.
No. This calculator is designed for adults (18+). For children and teenagers, BMI-for-age percentile charts should be used, as their healthy BMI ranges differ by age and gender. Consult a pediatrician for children's weight assessment.