??   Health Tool

BMI Calculator � Check Your Body Mass Index Online

Calculate your BMI online using Sri Lankan (Asian) or World (WHO) standards. Enter height and weight in any unit � get your weight category, health risk assessment, and doctor-reviewed medical advice instantly.

Enter Your Measurements
Select your preferred units for height and weight, choose a BMI standard, then press Calculate.
?? Height
Please enter a valid height (50 � 270 cm).
?? Weight
Please enter a valid weight (10 � 400 kg).
?? BMI Standard
Your BMI
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BMI 10BMI 20BMI 30BMI 40BMI 50
??   Possible Health Concerns
??   Medical Advice
?? Important

BMI is a screening tool, not a diagnosis. It does not measure body fat percentage, muscle mass, or fat distribution. Please consult a qualified healthcare provider for personalised advice.

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Reference
BMI Classification Tables
Sri Lankan (Asian) Standards
Recommended for Sri Lankans and South Asians
BMICategory
< 18.5Underweight
18.5 � 22.9Normal
23.0 � 24.9Overweight
25.0 � 29.9Obesity Class I
30.0 � 39.9Obesity Class II
= 40.0Obesity Class III
World (WHO) Standards
International classification used globally
BMICategory
< 18.5Underweight
18.5 � 24.9Normal Weight
25.0 � 29.9Overweight
30.0 � 34.9Obesity Class I
35.0 � 39.9Obesity Class II
= 40.0Obesity Class III
BMI Limitations
Important Medical Considerations

BMI is only one part of a comprehensive health assessment. It does not directly measure body fat percentage, muscle mass, or fat distribution.

?? What BMI Does Not Measure
  • Body fat percentage
  • Muscle mass
  • Fat distribution (where fat is stored)
  • Overall metabolic health
?? BMI May Be Less Accurate For
  • Athletes with high muscle mass
  • Elderly individuals
  • Pregnant women
  • Very muscular individuals
?? Doctors May Also Evaluate
  • Waist circumference
  • Blood pressure
  • Blood sugar levels
  • Cholesterol levels
  • Lifestyle habits and physical fitness
?? Key Message
  • Healthy weight management is about overall health, not appearance
  • Sustainable lifestyle changes are safer than rapid weight loss
  • Always seek medical advice for personalised guidance
FAQ
Common Questions
What is a normal BMI for Sri Lankans?
For Sri Lankans and other South Asians, a BMI between 18.5 and 22.9 is considered normal. A BMI of 23.0�24.9 is overweight, 25.0�29.9 is Obesity Class I, 30.0�39.9 is Obesity Class II, and = 40 is Obesity Class III. These thresholds are lower than international WHO standards because South Asians tend to develop metabolic complications at lower BMI values.
Why are Sri Lankan BMI standards different from World standards?
Research shows that South Asians (including Sri Lankans) develop obesity-related health complications � such as type 2 diabetes and cardiovascular disease � at lower BMI values compared to Western populations. This is partly due to body composition differences: South Asians tend to carry a higher proportion of body fat at the same BMI. Lower cut-off values are therefore recommended for this population.
How do I calculate my BMI manually?
BMI = Weight (kg) � Height (m)�. For example, if you weigh 70 kg and are 1.68 m tall: BMI = 70 � (1.68 � 1.68) = 70 � 2.8224 � 24.8. This calculator performs all unit conversions and the calculation for you automatically.
Is BMI an accurate measure of health?
BMI is a useful population-level screening tool but has limitations. It does not measure body fat percentage, muscle mass, or fat distribution. It can be misleading for athletes (who have more muscle), elderly people (who may have lost muscle mass), and pregnant women. Your doctor may also consider waist circumference, blood pressure, blood sugar, and cholesterol for a more complete assessment.
When should I see a doctor about my weight?
You should seek medical assessment if your weight changes suddenly or unintentionally, if you have symptoms related to obesity, if you experience fatigue or breathlessness, if you have been diagnosed with diabetes or hypertension, or if daily activities are becoming difficult. Early intervention can significantly reduce long-term complications and improve quality of life.
Can muscular people have a high BMI?
Yes. Athletes and highly muscular individuals may have a high BMI without excess body fat, because muscle is denser than fat. In such cases BMI can overestimate health risk. This is one of the well-known limitations of BMI as a screening tool � which is why doctors also consider body composition, waist circumference, and metabolic markers.
Is waist circumference important for health?
Yes. Abdominal fat (fat stored around the abdomen) increases metabolic risk even in people with a normal BMI. Excess waist circumference is linked to higher risk of type 2 diabetes, heart disease, and high blood pressure. Doctors may measure waist circumference alongside BMI for a more complete health picture.
Can BMI predict diabetes risk?
Higher BMI is associated with increased risk of type 2 diabetes, particularly in South Asians who develop metabolic complications at lower BMI values. However, BMI alone cannot diagnose or predict diabetes � blood sugar testing (such as FBS or HbA1c) is required for that. If your BMI is in the overweight or obesity range, your doctor may recommend screening for diabetes.

When Should You Seek Medical Advice?

Medical assessment is recommended if you experience any of the following:

??Weight changes suddenly or unintentionally
??Fatigue, breathlessness, or sleep problems are present
??You have obesity-related symptoms
??Diabetes or hypertension is already present
??Daily activities are becoming difficult
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Medical Disclaimer
This BMI calculator is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. BMI is a screening tool and does not constitute a medical diagnosis. Always consult your doctor or a qualified healthcare provider for personalised medical advice regarding your weight and health.