BMI Calculator

BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated by dividing weight in kilograms by height in meters squared (kg/m²). For example, if you weigh 70kg and are 1.75m tall, your BMI would be 70/(1.75×1.75) = 22.9.

BMI categories are: Underweight (under 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), and Obese (30 or greater). These ranges apply to adults aged 20 and older and are the same for men and women.

BMI has limitations and may not be accurate for athletes, elderly people, or during pregnancy. It doesn't distinguish between weight from muscle and weight from fat. Athletes often have high BMIs despite being healthy, while elderly people might have normal BMIs despite having less muscle mass.

It's recommended to check your BMI every 6-12 months as part of regular health monitoring. However, if you're actively trying to gain or lose weight, you might want to check it more frequently, such as monthly, while also considering other health metrics.

If your BMI is outside the normal range (18.5-24.9), consult with healthcare providers for personalized advice. They can assess your overall health, consider other factors, and help develop an appropriate plan for diet, exercise, and lifestyle changes if needed.

Yes, BMI for children and teens (aged 2-19) is calculated using the same formula but interpreted differently. It's compared to typical values for other children of the same age and sex using percentile rankings, often called "BMI-for-age."