Calculate your Body Mass Index (BMI) and get your health category assessment with healthy weight range recommendations.
Metric Formula: BMI = weight (kg) / [height (m)]²
Imperial Formula: BMI = 703 × weight (lbs) / [height (in)]²
The BMI categories are based on World Health Organization (WHO) standards:
BMI (Body Mass Index) is a numerical value calculated from your height and weight. It is a widely used screening tool to categorize individuals into underweight, normal weight, overweight, or obese categories. Health organizations worldwide use BMI as a simple, quick, and cost-effective way to assess body weight relative to height.
The BMI formula is: BMI = Weight (kg) / Height² (m²). For example, if you weigh 70 kg and are 1.75 m tall, your BMI = 70 / (1.75 × 1.75) = 22.86, which falls in the normal weight range. In imperial units: BMI = (Weight in pounds × 703) / Height in inches².
While BMI is a useful screening tool, it has limitations. It does not distinguish between muscle and fat mass, so athletes with high muscle mass may have a high BMI but actually be very healthy. It also does not account for age, gender, or where fat is distributed in the body. For a complete health assessment, use BMI alongside other measures like waist circumference, body fat percentage, and blood tests.
Our BMI calculator for adults also shows your healthy weight range — the weight range where your BMI falls between 18.5 and 24.9. This helps you set realistic weight goals. For children and teenagers, BMI is interpreted differently using age and gender-specific charts called BMI-for-age percentiles.
Maintaining a healthy BMI reduces your risk of type 2 diabetes, high blood pressure, heart disease, sleep apnea, and certain cancers. Even a modest weight loss of 5-10% of body weight can significantly improve health outcomes for overweight individuals. Use our BMI calculator online regularly as part of your health monitoring routine.
BMI (Body Mass Index) is a numerical value of your weight in relation to your height. It's a screening tool used to identify possible weight problems in adults. However, BMI doesn't diagnose body fatness or health.
BMI has limitations. It may overestimate body fat in athletes and underestimate it in older adults who have lost muscle mass. It also doesn't account for muscle mass, bone density, or fat distribution. Consider it a general guideline, not a definitive health measure.
A healthy BMI range is typically 18.5 to 24.9 for adults. However, what's healthy can vary based on age, gender, ethnicity, and muscle mass. Always consult with a healthcare provider for personalized health advice.
To lower BMI in a healthy way: combine a balanced diet with portion control, regular physical activity (150+ minutes moderate exercise weekly), adequate sleep, stress management, and consistency. Avoid crash diets or extreme measures. Consult a healthcare provider before starting any weight loss program.
BMI is one indicator of health, but not the only one. Other factors like waist circumference, blood pressure, cholesterol levels, blood sugar, and overall fitness are also important. If your BMI is outside the healthy range, consult a healthcare provider for a comprehensive health assessment.
