BMI Calculator (Free)
Use our free Body Mass Index (BMI) Calculator to instantly calculate your BMI and determine your weight status.
Based on your height, weight, and age, this tool helps you understand whether you're underweight, at a healthy weight, overweight, or obese. Includes age-based insights and supports both US and metric units. View your results on a dynamic BMI chart and learn your ideal healthy weight range.
To calculate your Body Mass Index (BMI), you'll need to know your weight and height. Once you have these details, you can determine your BMI using the two simple steps outlined below.
BMI = weight (kg) รท (height (m))2
Example:
A 177 cm (1.77 m) individual weighing 75 kg,
BMI = 75 / (1.77 * 1.77) = 75/ 3.13 = 23.96
BMI = weight (lb) รท (height (inches)) 2 ร 703
Example:
A 160-pound, 5โ8โ (68โ) individual weighing 75 kg,
BMI = (160/ 68*68) * 703 = (160/4624) * 703 = 24.3
You can also use an online BMI calculator to find out your BMI and eliminate human errors.
This is the World Health Organization's (WHO) recommended body weight based on BMI values for adults. It is used for both men and women, age 20 or older.
Classification | BMI range - kg/m2 |
Severe Thinness | < 16 |
Moderate Thinness | 16 - 17 |
Mild Thinness | 17 - 18.5 |
Normal | 18.5 - 25 |
Overweight | 25 - 30 |
Obese Class I | 30 - 35 |
Obese Class II | 35 - 40 |
Obese Class III | > 40 |
Got questions about Body Mass Index (BMI) Calculator? You're not alone. We've rounded up your top queries about our calculator and dished out the answers quick, clear, and to the point.