BMI Calculator

Calculate your BMI (Body Mass Index) using metric or imperial units. See your weight category and health classification.

Last updated: June 1, 2026

Weight (kg)

Height (cm)

• Underweight: BMI < 18.5

• Normal: 18.5 – 24.9

• Overweight: 25 – 29.9

• Obese: BMI ≥ 30

What is BMI Calculator?

A BMI (Body Mass Index) calculator computes a simple health metric based on your height and weight. BMI = weight(kg) / height(m)². It categorizes results as underweight (<18.5), normal weight (18.5-24.9), overweight (25-29.9), or obese (30+). While BMI doesn't account for muscle mass, bone density, or body composition (an athlete may have a high BMI due to muscle), it remains the most widely used screening tool by healthcare providers for identifying potential weight-related health risks in general populations. It's a starting point, not a diagnosis.

How It Works

Enter your weight and height in either metric (kg/cm) or imperial (lbs/feet+inches) units. The tool converts to metric if needed, then calculates BMI using the standard formula: weight in kilograms divided by height in meters squared. It displays your BMI value, the WHO classification category, and a visual indicator showing where you fall on the healthy weight spectrum. The tool also shows the healthy weight range for your height so you can see the target range. Results are immediate and update as you change inputs.

Common Use Cases

•Getting a quick health screening metric during personal fitness planning and goal setting
•Tracking BMI changes over time as part of a weight management program
•Understanding where you fall on the WHO weight classification scale
•Calculating target weight ranges based on your height for general health goals
•Preparing health information for insurance applications or wellness program requirements
•Educational purposes — understanding the relationship between height, weight, and health metrics