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What is the BMI Calculator?
The BMI calculator computes your Body Mass Index, a simple measure that uses your weight and height to estimate whether you are underweight, normal weight, overweight, or obese. BMI is widely used by doctors, nutritionists, and fitness professionals as a quick screening tool to identify potential weight-related health risks. It is not a direct measure of body fat, but it correlates closely with more direct measurements for most people.
How to Use the BMI Calculator
- Enter your weight in kilograms in the first field
- Enter your height in centimeters in the second field
- Press Calculate BMI to see your result instantly
BMI Formula
- BMI = weight (kg) ÷ height (m)²
Where weight is in kilograms and height is converted from centimeters to meters before being squared.
Example Calculation
| Field | Value |
|---|---|
| Weight | 70 kg |
| Height | 175 cm (1.75 m) |
| Height squared | 3.0625 m² |
| BMI | 22.9 (Normal weight) |
BMI Categories
- Underweight: BMI below 18.5
- Normal weight: BMI 18.5 to 24.9
- Overweight: BMI 25.0 to 29.9
- Obese: BMI 30.0 and above
These ranges are the standard WHO classifications used worldwide. The healthy weight range shown by the calculator is the weight that corresponds to a BMI between 18.5 and 24.9 for your height.
Why Calculate Your BMI?
Knowing your BMI helps you monitor your weight relative to your height. A BMI in the normal range is associated with a lower risk of cardiovascular disease, diabetes, and other chronic conditions. Tracking your BMI over time can help you spot trends early and make informed decisions about diet and exercise. Because BMI does not account for muscle mass, athletes and very muscular individuals may show a higher BMI without having excess body fat.
How the BMI Calculator Works
The calculator takes your height in centimeters and converts it to meters by dividing by 100. It then squares this value and divides your weight by the result. Finally, it maps the resulting number to the appropriate WHO category and computes the healthy weight range by multiplying the boundary BMI values (18.5 and 24.9) by your height squared. All calculations are performed instantly in your browser without sending any data to a server.
Frequently Asked Questions
Is BMI accurate for everyone?
No. BMI does not distinguish between muscle and fat, so it can overestimate body fat in athletes and underestimate it in older adults who have lost muscle mass. Use it as a general guide rather than a definitive health diagnosis.
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered healthy. Values below 18.5 are underweight and values of 30 or above are considered obese.
Can I calculate BMI using pounds and inches?
Yes. The standard imperial formula is BMI = weight (lb) × 703 ÷ height (in)². This calculator accepts metric inputs in kilograms and centimeters for simplicity.