BMI Calculator — Body Mass Index, Category & Healthy Range

Body Mass Index gives you a fast read on where your weight sits relative to your height, and it's usually the first number clinicians reach for when they start screening for weight-related health risk. As global weight-management guidelines keep shifting through 2026, knowing your own figure stays a sensible starting point. The result here returns your BMI, the category it falls into, the healthy weight range for your height, and a plain explanation of what those numbers signal.

The metric calculation is direct: weight in kilograms divided by the square of height in meters (BMI = kg/m²). Working in imperial units, you take weight in pounds divided by the square of height in inches and multiply by 703 (BMI = (lbs / in²) * 703). Either way, the result is a standardized, population-level measure of weight against height that flags potential risk quickly.

What BMI cannot do is measure body fat directly or distinguish muscle, bone density, and overall composition. A very muscular person can post a high BMI without carrying excess fat, while someone with little muscle may land in the 'healthy' band yet have an unhealthy body fat percentage. Read it as one screening input among several, and lean on a healthcare professional for a full picture of your health.