BMI Calculator - Complete Guide

Calculate your Body Mass Index (BMI) and understand what your score means for your health.

BMI Calculator Guide

Calculate your Body Mass Index and understand healthy weight ranges.

What is BMI?

BMI (Body Mass Index) is a screening tool that uses height and weight to estimate body fatness. It's calculated as:

BMI = Weight (kg) / Height (m)²

How to Use

  1. Enter your weight (kg or lbs)
  2. Enter your height (cm, m, or feet/inches)
  3. View your BMI and category

BMI Categories

BMI Range Category
Below 18.5 Underweight
18.5 - 24.9 Normal weight
25.0 - 29.9 Overweight
30.0 and above Obese

Understanding Your Results

Normal Weight (18.5 - 24.9)

Indicates a healthy weight relative to height. Maintain through balanced diet and regular exercise.

Underweight (Below 18.5)

May indicate nutritional deficiency. Consult a healthcare provider.

Overweight (25.0 - 29.9)

Slight health risk increase. Consider lifestyle modifications.

Obese (30.0+)

Higher health risk. Medical consultation recommended.

BMI Limitations

BMI doesn't account for:

  • Muscle mass (athletes may have high BMI)
  • Age differences
  • Gender differences
  • Ethnic variations
  • Body composition