Underweight
Being underweight might indicate that you aren't eating enough or that you are unwell. A doctor can assist you if you are underweight.

Weight that is appropriate
Continue your excellent job! Check out the food and diet and fitness pages for advice on how to maintain a healthy weight.

Overweight
If you are overweight, the best approach to reduce weight is by a mix of food and exercise.
The BMI calculator will provide you with a customized calorie allotment to assist you in maintaining a healthy weight in a safe manner.

Obese
If you're obese, the best approach to reduce weight is by a mix of food and exercise, as well as, in some situations, medications. See a doctor for assistance and guidance.

For children and adolescents aged 2 to 18, the BMI calculation considers age, gender, height, and weight.
Overweight children are known to be more vulnerable to a number of health issues, and they are also more likely to be overweight as adults.
The BMI calculator determines if a kid or adolescent is:
underweight – on the 2nd centile or less – between the 2nd and 91st centiles
Overweight – 91st centile or above Extremely overweight – 98th centile or higher
The BMI of a kid is stated as a “centile” to demonstrate how their BMI compares to children who participated in national surveys.
A girl in the 75th percentile, for example, is heavier than 75 out of 100 other females her age.
Measuring waist size is not commonly suggested for children since it does not account for their height.
If you are concerned about your child's weight, consult a doctor. They may be able to direct you to a local healthy living program for children, adolescents, and families.

Measuring your waistline is a useful approach to ensure that you are not carrying too much fat around your stomach, which can increase your risk of heart disease, type 2 diabetes, and stroke.
You might have a healthy BMI but yet have extra stomach fat, putting you at risk for certain illnesses.
To determine your waist size, use the following formula:
Locate the top of your hips and the bottom of your ribcage.
Wrap a tape measure around your waist and measure it halfway between these places.
Before taking the measurement, take a deep breath and exhale normally.
If your waist circumference is: regardless of your height or BMI, you should endeavor to reduce weight.
For males, a height of 94cm (37ins) or higher is required.
For ladies, 80cm (31.5ins) or more is required.
If your waist is: You're at a very high risk and should see a doctor if your waist is:
For guys, 102cm (40ins) or more is required.
Women must be at least 88cm (34ins) tall.

Your BMI can tell you whether you're overweight, but it can't tell you if you're overweight in fat.
The BMI is unable to distinguish between extra fat, muscle, and bone.
Age, gender, or muscle mass are not taken into account when calculating the adult BMI.
This refers to:
Even if their body fat is low, exceptionally muscular people and athletes may be classified as “overweight” or “obese.” Adults who lose muscle as they age may fall into the “healthy weight” range, even if they are carrying excess fat.
Pregnancy has an impact on a woman's BMI. As you gain weight, your BMI will rise. When determining your BMI, utilize your pre-pregnancy weight.
Apart from these drawbacks, the BMI is a simple and practical method of determining someone's weight.

Obese people are at a higher risk for a variety of illnesses and health issues, including the following:
Death from any reason (mortality)
Blood pressure is too high (hypertension)
High LDL cholesterol, low HDL cholesterol, or high triglyceride levels (dyslipidemia)
Diabetes type 2
Coronary artery disease
Stroke
Gallbladder dysfunction
Osteoarthritis (a breakdown of cartilage and bone within a joint)
Sleep apnea and breathing difficulties
Increased oxidative stress and chronic inflammation
Some types of cancer (endometrial, breast, colon, kidney, gallbladder, and liver)
Poor Life quality
Clinical depression, anxiety, and other mental diseases are examples of mental illnesses.
Pain in the body and trouble with physical functioning

Body mass index (BMI) is calculated by dividing a person's weight in kilograms by their height in meters squared. BMI is a low-cost and simple screening measure for weight categories such as underweight, healthy weight, overweight, and obesity.
Although BMI does not directly measure body fat, it is marginally linked with more direct measurements of body fat. Furthermore, BMI appears to be just as closely associated to many metabolic and illness outcomes as these more direct measurements of body fatness.

BMI can be used as a screening tool, but it does not diagnose an individual's body fatness or health. A healthcare practitioner will do additional evaluations to determine if BMI is a health risk. Skinfold thickness measures, dietary and physical activity evaluations, and family history are examples of such examinations.

BMI is a low-cost and simple instrument since it simply takes height and weight to calculate. To view the formula in kilos and meters or pounds and inches, go here.

Skinfold thickness measures (with calipers), underwater weighing, bioelectrical impedance, dual-energy x-ray absorptiometry (DXA), and isotope dilution are some more ways for measuring body fatness. However, these procedures are not always readily available, and they are either expensive or need highly experienced staff to carry out. Furthermore, many of these procedures are difficult to standardize between observers or computers, making comparisons across research and time periods more challenging.

Adults and children have the same BMI calculation method. The following formulae are used in the calculation:
weight (kg) / [height (m)]² is the formula.
The formula for BMI in the metric system is weight in kilograms divided by height in meters squared. Height is generally measured in centimeters, thus divide height in centimeters by 100 to get height in meters.
OR:
Weight (pounds) / [height (inches)]²x703
BMI is calculated by dividing weight in pounds (lbs) by height in inches (in) squared and multiplying by 703.

BMI is calculated using conventional weight status categories for people aged 20 and up. These categories apply to men and women of all ages and physical shapes.
Underweight is defined as a body mass index (BMI) of less than 18.5
Healthy Weight is between 18.5 and 24.9 pounds.
Overweight (BMI of 25.0–29.9)
Obesity is defined as a body mass index of 30.0 or higher.

Even though BMI is determined using the same method as adult BMI, it is interpreted differently for children and teenagers. The BMI of children and teenagers must be age and sex specific since the amount of body fat fluctuates with age and differs between girls and boys. The CDC BMI-for-age growth charts account for these variations and visually display BMI as a percentile rating. These percentiles were calculated using representative data from the US population of 2- to 19-year-olds obtained in multiple surveys ranging from 1963-1965 to 1988-1994.
Obesity in children aged 2 to 19 is defined as having a BMI that is at or above the 95th percentile among children of the same age and gender in this reference sample from 1963 to 1994. A 10-year-old kid of typical height (56 inches) and weight 102 pounds, for example, has a BMI of 22.9 kg/m2. This would put the youngster in the 95th percentile for BMI, which means his BMI is higher than that of 95% of similarly aged boys in this reference sample, and he would be termed obese.

Although there is a high association between BMI and body fatness, even if two persons have the same BMI, their amount of body fatness may differ.
Generally speaking,
Women have greater body fat than males at the same BMI.
Blacks have less body fat than Whites at the same BMI, but Asians have more body fat than Whites.
At the same BMI, older persons have more body fat than younger adults on average.
Athletes have less body fat than non-athletes at the same BMI.
BMI tends to be more accurate as a predictor of body fatness in those with greater levels of BMI and body fatness. While a person with a very high BMI (e.g., 40 kg/m2) is extremely likely to have high body fat, a person with a reasonably high BMI can have either high body fat or high lean body mass (muscle and bone). To assess an individual's health state and dangers, a skilled healthcare professional should conduct proper health evaluations.

Anyone with a BMI between 25 and 29.9 would be categorized as overweight, and anyone with a BMI over 30 would be classified as obese, according to the BMI weight status classifications.
Athletes, on the other hand, may have a high BMI due to enhanced muscularity rather than body fatness. A person with a high BMI is more likely to have body fatness and be deemed overweight or obese in general, however this may not be the case for athletes. To assess an individual's health state and dangers, a skilled healthcare professional should conduct proper health evaluations.