BMI Calculator: Understanding Body Mass Index

BMI (Body Mass Index) is a simple calculation using height and weight to categorize body size. While widely used, it has important limitations.

How BMI Is Calculated

BMI = weight (kg) / height² (m²). For imperial units: BMI = (weight in pounds / height² in inches) × 703.

BMI Categories

Underweight: Below 18.5
Normal weight: 18.5 – 24.9
Overweight: 25 – 29.9
Obese: 30 or higher

Limitations of BMI

BMI doesn't distinguish between muscle and fat. Athletes may have high BMI despite low body fat. It also doesn't account for age, sex, or fat distribution.

Better Health Indicators

Consider body fat percentage, waist circumference, waist-to-hip ratio, and overall fitness level for a more complete health picture.

Healthy Weight Range

For most adults, a BMI of 18.5-24.9 is considered healthy. Use our calculator to find your healthy weight range based on height.

Frequently Asked Questions

Is BMI accurate?

BMI is a useful screening tool but not diagnostic. It doesn't account for muscle mass, bone density, or fat distribution. Athletes may be classified as overweight despite being healthy.

What is a healthy BMI range?

18.5 to 24.9 is considered normal weight. However, optimal BMI varies by age, sex, and individual health factors.

How can I lower my BMI?

A combination of healthy eating (caloric deficit) and regular exercise. Aim for 1-2 pounds per week weight loss for sustainable results.