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BMI Calculator

Check your Body Mass Index and WHO health category instantly.

BMI Calculator

Check your Body Mass Index and WHO health category instantly.

BMI Calculator

Find your Body Mass Index and health category.

kg

Please enter valid height and weight.

Your BMI

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18.5 25 30
Healthy weight for your height: - kg

Accurate Body Mass Index (BMI) Calculator

Maintaining a healthy weight is one of the most critical aspects of overall well-being. But how do you know if your current weight is considered healthy for your specific height? This is where our free online BMI Calculator comes in. Body Mass Index (BMI) is a universally accepted screening tool used by doctors, nutritionists, and health professionals to determine whether a person is underweight, normal weight, overweight, or obese.

Our tool instantly processes your height and weight inputs to generate your exact BMI score. More importantly, it immediately categorizes your result according to the strict guidelines set by the World Health Organization (WHO). It also provides a target "Healthy Weight Range" specifically tailored to your height.

Important Medical Disclaimer

While BMI is a fantastic initial screening tool, it is not a diagnostic tool for body fatness or overall health. It does not account for muscle mass, bone density, or age. A muscular athlete might have an "overweight" BMI despite having very low body fat. Always consult a healthcare professional for a comprehensive health assessment.

How to Use the BMI Calculator?

Using our tool is fast, private, and extremely straightforward:

  1. Select Gender: Choose Male or Female. (Note: The standard adult BMI formula is the same for both, but this helps frame health advice).
  2. Enter Height: Input your height in Feet and Inches. Our tool will automatically convert this to meters behind the scenes.
  3. Enter Weight: Input your current weight in Kilograms (kg).
  4. Calculate: Click the red "Calculate BMI" button.
  5. Review Results: Instantly view your BMI score, your WHO health category, and the ideal weight range you should aim for.

The Standard BMI Formula

The mathematical formula for calculating BMI was developed by Adolphe Quetelet in the 19th century and remains the global standard today. The formula is:

BMI = Weight (kg) / [Height (m)]2

If you prefer to calculate it manually using Imperial units (pounds and inches), the formula changes slightly by adding a conversion factor of 703:

BMI = [Weight (lbs) / (Height (in))²] × 703

Understanding the BMI Chart Categories

Once you have your BMI number, what does it actually mean? The World Health Organization (WHO) divides adult BMI into four primary categories:

BMI Range Health Category Health Risk
Below 18.5 Underweight Potential for nutritional deficiency, osteoporosis.
18.5 – 24.9 Normal Weight Lowest risk of weight-related diseases.
25.0 – 29.9 Overweight Moderate risk. Elevated risk of heart disease & type 2 diabetes.
30.0 and Above Obese High risk. Significantly increased risk for cardiovascular diseases.

Example BMI Calculation

Let's look at an example. Suppose a person is 5 feet 9 inches tall and weighs 75 kilograms.

  • Step 1 (Convert Height): 5 feet 9 inches is equal to 69 inches. Converting inches to meters: 69 × 0.0254 = 1.7526 meters.
  • Step 2 (Square the Height): 1.7526 × 1.7526 = 3.0716 m².
  • Step 3 (Divide Weight by Squared Height): 75 kg / 3.0716 m² = 24.4.

This person's BMI is 24.4, which falls perfectly into the upper end of the Normal Weight category.

Frequently Asked Questions

According to the World Health Organization (WHO), a normal, healthy BMI range for adults is between 18.5 and 24.9. A BMI below 18.5 is considered underweight, 25.0 to 29.9 is overweight, and 30.0 or higher is considered obese.

While BMI is a useful screening tool for most people, it does have limitations. It does not distinguish between muscle mass and fat mass. Therefore, highly muscular athletes may have a high BMI but low body fat. It is also not accurate for pregnant women or the elderly.

The mathematical formula for BMI is straightforward: Weight in kilograms divided by Height in meters squared (kg/m²). Our calculator handles this conversion automatically whether you input centimeters or meters.

No, the standard adult BMI categories do not apply to children and teens. For individuals under 20 years old, BMI is compared against age- and sex-specific percentiles, not fixed thresholds.

If your BMI falls outside the normal range (18.5 - 24.9), it may indicate a higher risk for health issues. You should consult with a healthcare provider or a certified nutritionist to discuss an appropriate diet and exercise plan.