BMI Calculator – Free Online Tool to Check Your Body Mass Index
The BMI Calculator helps you determine your Body Mass Index based on your height and weight. It gives an indication of whether you are underweight, normal weight, overweight, or obese. This simple tool is useful for both adults and children, using WHO classification standards.
How to Use the BMI Calculator
Enter your weight (in kg or pounds) and your height (in cm or feet/inches). The BMI Calculator will instantly display your BMI score along with a weight status classification.
BMI Formula
- Metric: BMI = weight (kg) / height² (m²)
- US Units: BMI = (weight in lbs / height in in²) × 703
The result is a number that falls into a specific range used to assess your body weight status.
BMI Categories
| BMI Range | Category |
|---|---|
| Less than 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25 – 29.9 | Overweight |
| 30 and above | Obese |
Why Use a BMI Calculator?
The BMI calculator is a fast and accessible way to assess your health risk related to body weight. While it doesn’t measure body fat directly, it’s widely used by health professionals as an initial screening tool. It's ideal for tracking progress in weight management, fitness plans, or medical assessments.
Frequently Asked Questions (FAQs)
What is BMI and why does it matter?
BMI (Body Mass Index) is a simple index of weight-for-height used to classify underweight, overweight, and obesity in adults.
Is BMI accurate?
While BMI is a useful screening tool, it doesn’t account for muscle mass or fat distribution. For more accuracy, consider body fat measurements.
Can I use this BMI calculator for children?
This tool is suitable for adults. For children and teens, BMI-for-age percentiles are recommended.
What is a healthy BMI range?
18.5 to 24.9 is considered a healthy BMI range for most adults.
Does BMI differ by gender or age?
While the formula is the same, body composition can vary by gender and age. Always consider context with BMI results.
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