BMI Calculator
Calculate your Body Mass Index and determine your health category.
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Enter your values and the result appears here
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About this calculator
Body Mass Index (BMI) is a quick way to check if your weight is in a healthy range for your height. It is not a perfect measure — it does not account for muscle mass or body composition — but it is a useful starting point that doctors have relied on for decades. Our BMI calculator gives you an instant result along with your category so you know where you stand. Think of it as a helpful signal, not a final verdict.
The formula, explained simply
The formula is straightforward: take your weight in kilograms and divide it by your height in meters squared. We do the math for you — just enter your weight and height, and we show your BMI along with the corresponding category. The World Health Organization defines these ranges: below 18.5 is underweight, 18.5 to 24.9 is normal, 25 to 29.9 is overweight, and 30 or above is obese. Your result updates instantly as you type.
When you would use this
People check their BMI for all kinds of reasons — annual physicals, fitness progress, insurance applications, or just personal curiosity. Doctors use it as an initial screening tool. Trainers track it alongside other metrics. If you are starting a new health routine, knowing your BMI gives you a baseline to measure against over time.