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FREE ONLINE BMI CALCULATOR
Calculate your Body Mass Index instantly. Find your healthy weight range and BMI category. Free, accurate, no signup required.
cm
kg
Please enter both height and weight.
What is BMI?
BMI (Body Mass Index) is calculated by dividing your weight in kilograms by your height in metres squared. Formula: BMI = weight (kg) / height (m)2. It provides a quick screening tool to categorise weight status.
BMI Categories Explained
- Under 18.5 — Underweight: May indicate nutritional deficiencies
- 18.5 to 24.9 — Healthy weight: Lowest risk of weight-related health issues
- 25 to 29.9 — Overweight: Increased risk of cardiovascular disease and diabetes
- 30 and above — Obese: Significantly elevated health risks
How to Calculate Your BMI
- Enter your height in centimetres above
- Enter your weight in kilograms
- Click Calculate BMI
- View your BMI score and category with colour coding
Limitations of BMI
- Does not distinguish between fat and muscle mass
- Does not account for fat distribution
- May overestimate obesity in muscular athletes
- Always consult a healthcare professional for a complete assessment
Frequently Asked Questions
What is a healthy BMI?+
18.5 to 24.9 is considered healthy. Under 18.5 is underweight. 25-29.9 is overweight. 30 and above is obese.
Is BMI accurate for everyone?+
BMI is a general guide and does not account for muscle mass, bone density, or ethnicity. Athletes often have high BMI despite being healthy.
Does BMI differ for men and women?+
The standard scale is the same, but women naturally carry slightly more body fat at the same BMI value.
What should I do if my BMI is unhealthy?+
Consult a healthcare professional for a complete assessment and personalised advice.
Can I use this for children?+
Standard BMI is for adults 20+. Children should use age-specific BMI charts. Consult a paediatrician.