BMI Calculator

Body Mass Index (BMI) is calculated from height and weight and is widely used as an initial screening indicator for weight-related health risks. A BMI below 18.5 is underweight; 18.5–24.9 is the healthy range; 25–29.9 is overweight; and 30 or above is classified as obese. This BMI calculator works in both metric (kilograms and centimetres) and imperial (pounds and feet/inches) units. Enter your height and weight to see your BMI value, your weight category, and the healthy weight range for your specific height. BMI is a screening tool, not a medical diagnosis — consult a qualified healthcare provider for a full health assessment. People reach for this calculator in a wide variety of everyday situations. Someone returning to the gym after a long break might check their BMI to establish a baseline before starting a new fitness programme and then revisit it monthly to track broad changes alongside other metrics. A parent tracking a teenager's growth over the years might use it to see whether their child's weight is proportionate to their increasing height. Nurses and healthcare assistants working in busy clinic environments also use quick online BMI tools to double-check a figure before documenting it in patient notes, particularly when switching between metric and imperial measurements from different referral sources. This tool is especially useful for health-conscious individuals, personal trainers, and primary care staff who need a fast, no-fuss way to convert physical measurements into a standardised index. All calculations run entirely in your browser — no data is sent to any server, so your height, weight, and results remain completely private on your own device. There is nothing to install and no account required, making it a convenient first step whenever a rough weight-status check is needed before a deeper conversation with a doctor or dietitian.