Free BMI Calculator – Know Your BMI Instantly

Use BMI Hero's free online BMI calculator to find your body mass index in seconds. Supports both metric and imperial units with real-time results.

How BMI Is Calculated

BMI is calculated by dividing your weight in kilograms by the square of your height in metres. The result gives a number that corresponds to one of four weight categories.

BMI Categories Explained

Once you calculate your BMI, compare it to the standard WHO categories below. Each range carries different health implications.

Track Your BMI Over Time

A single BMI reading is useful, but tracking over time reveals trends in your health progress. We recommend checking monthly. Bookmark BMI Hero for quick access.

Remember that BMI is a screening tool. Athletes, pregnant women, and the elderly may need supplementary measurements for a complete health picture. Always consult a healthcare professional for personalised advice.