NIH BMI Chart

What is the BMI, and how is it calculated?

Your height and weight are used to calculate your BMI, which tells you whether or not your current weight is healthy.

For adults, BMI is calculated by dividing an individual’s weight in kilograms by his or her height in square meters. A BMI of 25 equates to a weight-to-height ratio of 25 kilograms per square meter.

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BMI ranges.

The optimum BMI range for most adults is between 18.5 and 24.9.

Age, gender, height, and weight are all taken into account when calculating BMI for children and adolescents aged 2 to 18.

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BMI Chart: According to NIH

nih bmi chart

Accuracy of BMI

To get a healthy weight range, BMI takes into account the natural variances in body shape. When determining whether or not you have a healthy weight, healthcare practitioners may consider additional criteria in addition to your BMI. Heavyweight boxers, weight trainers, and athletes with a lot of muscle mass may have a healthy body mass index (BMI) yet still be considered obese. This is because muscle mass is significantly denser than fat mass.

Some health disorders can be made more likely or more difficult to treat based on your ethnicity. If you have a BMI of 23, which is considered healthy for persons of South Asian descent, you may be at greater risk of developing certain health issues, such as diabetes. If you’re pregnant, you shouldn’t use BMI as a metric. Your midwife or GP can help you if you’re concerned about your weight during pregnancy.

Why Is a Healthy Weight Important?

Achieving and maintaining a healthy weight is critical for general well-being and can aid in the prevention and treatment of a wide range of illnesses. It is important to keep in mind that if you are overweight or obese you are more likely to suffer from a wide range of health issues including heart disease and high blood pressure. Because of this, it is critical to keep a healthy weight in order to reduce your risk of acquiring these issues, improve your self-esteem, and provide you with more energy to take pleasure in life.

What Are Overweight and Obesity?

A person who is overweight has excess weight on their body, whether it comes from fat, muscle, or water. When you’re obese, you’ve got a lot of additional body fat on your body. Overweight and obesity can be quantified by calculating one’s BMI. You may learn more about BMI and how to achieve and maintain a healthy weight from the information on this website. If you are concerned about your BMI, see your doctor.

What Factors Contribute To a Healthy Weight?

A person’s weight can be affected by a variety of circumstances. A person’s metabolism (the process through which food and oxygen are converted into energy) and behavior or habits are a few examples of these influences.

Energy Balance

Maintaining a healthy body weight necessitates a well-balanced energy intake and expenditure. Food and beverage intake (energy IN) is equal to the amount of energy your body expends (energy OUT), such as breathing, digesting, or engaging in physical activity.

  • The same amount of energy IN and energy OUT over time = weight stays the same (energy balance)
  • More energy IN than OUT over time = weight gain
  • More energy OUT than IN over time = weight loss


You don’t have to have a precise balance of energy coming in and going out every day in order to maintain a healthy weight. Maintaining a healthy weight is all about finding the right balance over time.

If you want to lose weight and keep it off, try these tips.

You can lose weight by reducing your caloric intake by 500 calories per day if you are overweight or obese.

  • Follow a healthy diet, and if you are overweight or obese, reduce your daily intake by 500 calories for weight loss
  • Are physically active
  • Limit the time you spend being physically inactive

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