Free BMI Calculator — Body Mass Index Calculator Online
Quickly check your Body Mass Index and understand your weight category offline.
Body Measurements
Your BMI
Ideal Weight Range
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How to Use the BMI Calculator
Using our free BMI calculator is extremely simple. Enter your height (in cm or feet/inches) and your weight (in kg or lbs), then click 'Calculate'. Your BMI score and weight category will appear instantly. The tool supports both metric and imperial units, so you can use whatever measurement system you prefer.
What is BMI and What Do the Numbers Mean?
BMI (Body Mass Index) is a numerical value calculated from your height and weight. It is widely used by doctors and health professionals as a quick screening tool. Here is how to read your BMI result: Under 18.5 = Underweight. 18.5 to 24.9 = Normal/Healthy weight. 25.0 to 29.9 = Overweight. 30.0 and above = Obese. Note that BMI is a general guideline and does not account for muscle mass, age, or bone density. Always consult a doctor for personalized health advice.
BMI for Adults vs Children
This BMI calculator is designed for adults aged 18 and above. BMI interpretation for children and teenagers is different — it uses age and gender-specific BMI percentile charts. If you need to calculate BMI for a child, we recommend consulting a pediatrician who can use the appropriate growth charts.
Frequently Asked Questions
Is BMI an accurate measure of health?
BMI is a useful starting point but not a complete picture of health. Athletes with high muscle mass may have a high BMI but be perfectly healthy.
How often should I check my BMI?
For most adults, checking BMI once every few months is sufficient when monitoring weight changes.
Does this calculator store my data?
No. All calculations happen in your browser. Your height and weight data is never sent to our servers.