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BMI Calculator
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Calculate Your BMI
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What is BMI?
Understanding your Body Mass Index
How It Works
BMI (Body Mass Index) is calculated by dividing your weight in kilograms by your height in meters squared. It's a simple screening tool for weight categories.
BMI Categories
- ● Underweight: BMI < 18.5
- ● Normal Weight: BMI < 24.9
- ● Overweight: BMI < 29.9
- ● Obese (Class I): BMI < 34.9
- ● Obese (II+): BMI ≥ 35
Limitations
BMI doesn't account for muscle mass, bone density, or body composition. Athletes may have a high BMI but low body fat. Use it as a starting point, not a final diagnosis.
Frequently Asked Questions
Common questions about BMI and body weight.
A healthy BMI falls between 18.5 and 24.9. This range is associated with the lowest risk of weight-related health issues. However, BMI is just one measure — body composition, fitness level, and lifestyle also matter.
BMI is a useful screening tool but has limitations. It doesn't differentiate between muscle and fat mass, so muscular individuals may show a high BMI despite being healthy. For a complete picture, combine BMI with body fat percentage and waist circumference measurements.
Checking your BMI monthly is sufficient for tracking progress. More important than the number itself is the trend over time. Pair it with regular body measurements and progress photos for a comprehensive view of your fitness journey.
Yes. BMI interpretation can vary slightly by age and gender. Women naturally carry more body fat than men at the same BMI. For children and teens, BMI is assessed using age- and sex-specific percentile charts rather than fixed ranges.
If your BMI is outside the healthy range, the first step is to consult a fitness professional or healthcare provider. A structured program combining proper nutrition and progressive training can help you reach a healthier body composition safely and sustainably.