Free BMI Calculator

Calculate Your
Body Mass Index

Find out if you're at a healthy weight. Our BMI calculator gives you instant results with personalized recommendations to help you reach your health goals.

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cm
kg

This calculator provides an indication only. Always consult your doctor or a registered dietitian for personalized health advice.

BMI Categories

Underweight
Below 18.5
Normal
18.5 to 24.9
Overweight
25.0 to 29.9
Obese
30.0 & Above
1518.5253040+

What is BMI?

Body Mass Index (BMI) is a simple calculation using your height and weight to estimate body fat. While it doesn't measure body fat directly, it's a useful screening tool to identify potential weight-related health issues.

The formula is: BMI = weight (kg) / height (m)²

Health Risks by Category

Underweight (BMI < 18.5)

  • Weakened immune system and increased susceptibility to infections
  • Nutrient deficiencies leading to fatigue and weakness
  • Bone loss and increased risk of osteoporosis
  • Fertility issues and hormonal imbalances

Normal Weight (BMI 18.5-24.9)

  • Lower risk of chronic diseases
  • Better cardiovascular health
  • Optimal energy levels and physical performance
  • Healthy hormone balance and metabolism

Overweight (BMI 25-29.9)

  • Increased risk of Type 2 diabetes
  • Higher blood pressure and cholesterol levels
  • Sleep apnea and breathing difficulties
  • Joint stress and early onset arthritis

Obese (BMI 30+)

  • Significantly higher risk of cardiovascular disease and stroke
  • Increased risk of 13+ types of cancer
  • Severe sleep apnea and respiratory issues
  • Non-alcoholic fatty liver disease
  • Chronic joint pain and mobility issues

BMI Limitations

While BMI is a useful screening tool, it has limitations:

  • Doesn't distinguish between muscle mass and fat mass
  • May not be accurate for athletes or bodybuilders
  • Doesn't account for age, sex, or ethnicity differences
  • Doesn't indicate where fat is distributed on the body

Ready to Take Action?

Whatever your BMI result, we can help. Our AI creates personalized meal plans tailored to your specific goals — whether you want to lose weight, gain muscle, or maintain your healthy weight.

Medical Disclaimer

This BMI calculator is provided for informational and educational purposes only. The results are an indication and should not be considered medical advice. Always consult with your doctor, physician, or a registered dietitian before making any changes to your diet or exercise routine. Individual health needs vary, and a healthcare professional can provide personalized guidance based on your complete health profile.

Health information sourced from CDC, WHO, and Cleveland Clinic.