BMI Calculator cm kg

People’s BMI (Body Mass Index) is the sum of their weight in kilograms (or pounds) and their height in meters (or feet) (or feet). A high body mass index (BMI) may be a sign of excessive body fat. An individual may have an abnormally high BMI, but this does not mean that they are obese or that they are unhealthy.


How is BMI used?

BMI can be used as a screening tool, but it cannot be used to determine an individual’s body fatness or health. Further tests are carried out by a medical professional to ascertain if a person’s BMI poses a danger to their health. Skinfold thickness measures, analyses of food, physical activity, and family history are among the methods used in these assessments.

How is BMI calculated?

Adults and children use the same method to calculate BMI. The following formulas form the basis of the computation:

Measurement UnitsFormula and Calculation
Kilograms and meters (or centimeters)Formula: The BMI (Body Mass Index) in (kg/m2) is equal to the mass in kilograms (kg) divided by the square height in meters (m):
BMI(kg/m2) = mass(kg) / height2(m)
• Example: Weight = 68 kg, Height = 165 cm (1.65 m)
• Calculation: 68 ÷ (1.65)2 = 24.98
Pounds and inchesFormula: The BMI (Body Mass Index) in (kg/m2) is equal to the mass in pounds (lbs) divided by the square height in inches (in) times 703:
BMI(kg/m2) = mass(lb) / height2(in) × 703
• Example: Weight = 150 lbs, Height = 5’5″ (65″)
• Calculation: [150 ÷ (65)2] x 703 = 24.96

How is BMI interpreted for adults?

BMI is interpreted for adults over the age of 20 using established weight status categories. Regardless of gender or physical appearance, these classifications apply to both sexes regardless of age.

BMI CategoryBMI Range
Health risk
Underweight18.4 and belowMalnutrition risk
Normal weight18.5 – 24.9Low risk
Overweight25 – 29.9Enhanced risk
Moderately obese30 – 34.9Medium risk
Severely obese35 – 39.9High risk
Very severely obese40 and aboveVery high risk

BMI Chart in cm kg

BMI Chart

Limitations of using BMI

Please keep in mind that BMI has some limits.

  • Because BMI does not distinguish between fat, muscle, and fluid mass, it may not be reliable. The muscle mass of the elderly is substantially smaller than the fat mass, and many of them suffer from medical disorders that can increase their fluid mass as a result of this.
  • Sarcopenia and malnutrition are not taken into account when calculating BMI because height is an important determinant of BMI (loss of muscle and function).

Because of this, BMI is still the most widely utilized weight status measurement across a wide range of healthcare contexts. As a result, we must remember to apply the appropriate BMI levels for those above the age of 65. Aged care dietitians can help with any questions you may have concerning BMI and what to do with the results.

How Can I Lower My BMI?

A person’s body fat percentage in relation to their height and weight is calculated using their BMI, or Body Mass Index. A person’s BMI can be used to evaluate whether they are underweight or overweight, but it is not a perfect predictor of their general health.

BMI can be calculated by doctors and other medical professionals, however, a BMI calculator can also be utilized. Using a chart like the one below, or the NHS’s interactive BMI calculator, you may get a good estimate of your score by entering your height in centimeters and your weight in kilograms.

A healthy BMI range for persons over the age of 20 is 18.5 to 24.5. Anything under or above this range could indicate that a person is underweight, and vice versa for anything beyond (30 to 39.9). For example, some athletes may have a BMI that suggests they are overweight because their muscles are heavier than their fat. This is because muscle weighs more than fat.

People with high BMI are more likely to suffer from a wide range of health problems such as heart disease and diabetes as well as high blood pressure and stroke. Maintaining a healthy BMI is therefore critical to your overall health. Keep reading for our best advice on how to maintain a healthy BMI between 18.5-24.5. Make no mistake, this is not a complex procedure.


In order to lower your BMI and generally maintain a healthy weight, the basic idea is to consume the same or slightly fewer calories than you expend. Calculate how many calories you burn each day with a calorie counter (you’ll need to enter your workout routine and work environment specifics) and then eat no more or no less than that number of calories per day if you’re trying to lose weight.


Cutting out processed foods (crisps, ready meals, etc.), will also help you reduce your fatty food intake, and avoiding the salt shaker will help you reduce your sodium intake. It is preferable to utilize herbs and spices to season your cuisine.


Regular aerobic activities are an excellent way to shed pounds and tone up your body. Fat is the primary source of fuel for cardiovascular workouts, with carbohydrates and protein utilized to a lesser level. All of these aerobic exercises will help you lose weight, including running, cycling, walking, and rowing.

How to Increase BMI?

Changing your diet is the most effective strategy to gain weight and raise your BMI. Consult your doctor if you’ve tried a new diet and are still unable to raise your BMI. Hyperthyroidism, for example, could be a factor. In order to learn how to boost BMI, it’s best to consult with your doctor.


If you want to put on weight, you must eat more calories than you expend. Weight gain is a result of eating more calories, which raises BMI. Losing weight is much simpler to figure out than gaining weight. Everyone’s body is unique and genetics play a role. Some people require more calories, while others require fewer.

Get an estimate of how many calories are needed to maintain your weight before you begin. Women typically consume between 1600 and 2400 calories per day. Between 2000 to 3000 calories are typical for guys.

Slowly gaining weight is the best way to do so. An additional 250 to 500 calories per day is believed to be required to grow half a pound (approximately 1/4 to 1/2 kg) every week. Women typically need to consume between 1850 and 2900 calories per day. It is typical for guys to consume between 2,250 and 3,500 calories a day.

What to Eat?

It’s crucial to eat healthily while you’re trying to gain or lose weight.

  • Junk food is high in calories, but it’s also bad for you, and eating too much of it won’t raise your BMI. Eating foods that are both high in calories and nutrients is essential to a healthy diet.
  • Salmon, tuna, and nuts, and seeds are other good sources of omega-3 fatty acids. Avocados, yogurt, milk, salmon, peas, brown rice, quinoa, granola, bananas, dried apricots, sweet potatoes, salmon, and tuna are also good sources of these nutrients.


When a person’s BMI rises, they will gain some weight in the form of fat. However, excessive fat intake can also be detrimental. Strength training is a great way to build muscle mass and improve your overall health.

Lactate buffering is a major factor in repeat sprint performance, according to Professor Dave Bishop.

His research has shed light on how we might improve our muscle buffering capacity through training. Make certain that the training you provide is both appropriate and purposeful.

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