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BMI Calculator Complete Guide

Calculate your Body Mass Index and understand what it means for your health. Get personalized recommendations based on your results.

What is BMI?

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.

BMI = weight (kg) / height² (m²)

BMI Categories

BMI RangeCategoryHealth Risk
Below 18.5UnderweightMalnutrition risk
18.5 - 24.9Normal weightLow risk
25.0 - 29.9OverweightIncreased risk
30.0 - 34.9Obesity Class IModerate risk
35.0 - 39.9Obesity Class IISevere risk
40.0 and aboveObesity Class IIIVery severe risk

Why BMI Matters

Heart Health

Screen for cardiovascular risks

Fitness Goals

Track weight management progress

Health Screening

Identify potential health issues

BMI Limitations

While BMI is useful, it doesn't account for:

  • Muscle mass: Athletes may have high BMI but low body fat
  • Bone density: Varies between individuals
  • Body composition: Fat vs muscle distribution
  • Age and gender: Different standards apply
  • Ethnicity: Risk levels vary by background

Healthy Weight Tips

  • 💪

    Exercise regularly - at least 150 minutes per week

  • 🥗

    Eat a balanced diet with fruits and vegetables

  • 💧

    Stay hydrated - drink 8 glasses of water daily

  • 😴

    Get enough sleep - 7-9 hours per night

  • ⚕️

    Consult healthcare providers for personalized advice

Calculate Your BMI Now

Free BMI calculator with instant results and health recommendations.

Try BMI Calculator