BMI Calculator: Calculate Your Body Mass Index
Meta Description:
Use our free BMI Calculator to calculate your Body Mass Index from height and weight. See your BMI category, healthy BMI range, formula, and what your result means.
What Is BMI?
Body Mass Index, or BMI, is a simple measurement that compares your weight with your height. It is commonly used as a screening tool to help identify whether an adult falls within an underweight, healthy weight, overweight, or obesity range.
Use the BMI Calculator above to calculate your BMI from your height and weight. Your result gives you a quick reference point, but it should not be treated as a complete measure of your health or body composition.
How Is BMI Calculated?
BMI is calculated using your weight and height:
BMI = weight in kilograms ÷ height in meters²
For example, if you weigh 70 kg and are 1.75 meters tall:
70 ÷ (1.75 × 1.75) = 22.9
Your BMI would be approximately 22.9 .
The calculator performs this calculation automatically, so you only need to enter your height and weight to get your result.
BMI Chart for Adults
For adults age 20 and older, BMI results are generally grouped into the following categories:
|
BMI |
Weight Category |
|
Below 18.5 |
Underweight |
|
18.5 to 24.9 |
Healthy weight |
|
25.0 to 29.9 |
Overweight |
|
30.0 or higher |
Obesity |
A BMI between 18.5 and 24.9 is considered within the standard healthy weight range for most adults.
What Does Your BMI Result Mean?
Your BMI can provide a useful starting point for understanding how your weight compares with your height.
However, BMI does not directly measure body fat. It also cannot distinguish between fat, muscle, bone, and other body tissues. This means two people with the same BMI may have very different body compositions.
People with a high amount of muscle, including some athletes, may have a higher BMI even when their body fat level is relatively low.
For a broader view of body composition, you may also want to use the Body Fat Calculator .
Is BMI Accurate?
BMI accurately calculates the relationship between height and weight, but it has limitations when used to assess an individual's health.
It does not consider factors such as muscle mass, body fat distribution, fitness level, age-related changes in body composition, or medical history.
For this reason, BMI is best used as a screening tool rather than a diagnosis .
Frequently Asked Questions
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 falls within the standard healthy weight category.
Is BMI the same as body fat percentage?
No. BMI compares weight with height, while body fat percentage estimates how much of your total body weight comes from fat.
Is BMI calculated differently for men and women?
No. The standard adult BMI formula is the same for men and women.
Can muscular people have a high BMI?
Yes. Because BMI cannot distinguish muscle from fat, someone with a large amount of muscle may have a BMI in the overweight range without having excess body fat.
About This BMI Calculator
The NutritionSolver BMI Calculator uses the standard Body Mass Index formula to calculate BMI from your height and weight. Results are intended for general educational and screening purposes.
BMI should be considered alongside other health information when making decisions about your weight or overall health.