BMI Calculator

Frequently Asked Questions

What is BMI?

Body Mass Index (BMI) is a simple measure that uses your height and weight to work out if your weight is healthy. The BMI calculation:

  • Divides your weight in kilograms by your height in meters squared
  • Provides a score that may indicate if you're underweight, healthy weight, overweight, or obese
  • Is used by healthcare professionals as a screening tool
  • Is suitable for most adults aged 18-65

What do BMI ranges mean?

BMI ranges are categorized as follows:

  • Under 18.5 = Underweight
  • 18.5 to 24.9 = Normal weight
  • 25.0 to 29.9 = Overweight
  • 30.0 or higher = Obesity

What are BMI's limitations?

While BMI is useful as a general guide, it has some limitations:

  • Doesn't account for muscle mass, bone density, age, or gender
  • May not be suitable for athletes or bodybuilders
  • Different considerations may apply for children and elderly
  • Some ethnic groups may have different healthy BMI ranges

How often should I check my BMI?

BMI monitoring frequency depends on your health goals:

  • General health maintenance: Every 6-12 months
  • During weight management: Monthly to track progress
  • After significant lifestyle changes: Every 3-4 months
  • Always consult healthcare providers for personalized advice