BMI Calculator

Calculate your Body Mass Index (BMI) to determine if you're at a healthy weight. Quick, accurate, and easy to use.

Measurement System

Height

Weight

Note: BMI is a general indicator and may not accurately reflect the health of athletes, children, the elderly, or those with unique body compositions. Consult a healthcare provider for personalized advice.

What is BMI?

BMI (Body Mass Index) is a measure that uses your height and weight to work out if your weight is healthy. The BMI calculation divides an adult's weight in kilograms by their height in meters squared. For adults 20 years old and older, BMI is interpreted using standard weight status categories that are the same for all ages and for both men and women.

How to Calculate BMI

You can calculate BMI using the following formulas:

Metric System

BMI = weight (kg) / height (m)²

Imperial System

BMI = (weight (lb) / height (in)²) × 703

BMI Categories

The table below shows the different BMI categories based on guidelines from the World Health Organization (WHO).

BMI Range	Category	Description
Below 18.5	Underweight	Being underweight can indicate malnutrition, eating disorders, or other health issues. It's important to consult a healthcare provider to determine the cause and appropriate interventions, which may include dietary changes and addressing underlying health conditions.
18.5 - 24.9	Normal weight	This range is considered healthy. Maintaining a BMI in this range typically indicates a lower risk of health issues associated with underweight or overweight. Continue a balanced diet and regular physical activity to stay within this range.
25 - 29.9	Overweight	Being overweight can increase the risk of various health conditions, such as heart disease, diabetes, and hypertension. It may be beneficial to consult a healthcare provider to develop a plan for achieving a healthier weight through diet, exercise, and lifestyle changes.
30 and above	Obesity	Obesity significantly increases the risk of serious health conditions, including heart disease, diabetes, high blood pressure, and certain cancers. It's important to work with healthcare providers to create a comprehensive plan that includes dietary changes, physical activity, and possibly medical interventions to reduce health risks.

Why You Should Measure Your BMI

Measuring BMI can help identify whether you are at a healthy weight, underweight, overweight, or obese. Knowing your BMI can be the first step in assessing various health conditions.

A high BMI can be an indicator of potential health issues such as heart disease, high blood pressure, type 2 diabetes, and certain cancers. Measuring your BMI can help detect and manage these conditions early.

Understanding your BMI can help you set realistic weight management goals and guide your efforts to achieve a healthier lifestyle.

Who Should Measure Their BMI

BMI is a useful screening tool for adults over the age of 18. It applies to both men and women and can be used to monitor changes in weight over time.

Individuals with a family history of conditions such as diabetes, heart disease, or hypertension should measure their BMI regularly as they might be at higher risk.

If you have experienced significant weight gain or loss, measuring your BMI can help determine if these changes are impacting your health.

Additional Information

BMI is a useful measurement for most people over 18 years old. However, it is only an estimate and it doesn't take into account age, ethnicity, gender, and body composition.

BMI may not be accurate for:

Older adults or people with low muscle mass (may underestimate body fat)
Athletes or people with high muscle mass (may overestimate body fat)

Despite these limitations, BMI is a relatively easy and non-invasive way to screen for weight categories that may lead to health problems. For a more accurate assessment, consult with a healthcare provider who can perform additional tests.