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dr swati shah - uro & gynec cancer surgeon
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BMI Calculator with Gauge Chart

BMI Calculator


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Your BMI is:

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Health Advice
BMI Weight Ranges
Less than 18.5 = Underweight
Between 18.5 - 24.9 = Healthy Weight (Normal)
Between 25 - 29.9 = Overweight
Over 30 = Obese

BMI Calculator | Body Mass Index

Want to know how your body weight affects your health? Learning about your Body Mass Index (BMI) can be very helpful. It shows whether your weight is in a healthy range. The best part is, it’s easy to calculate! With a BMI calculator, you’ll get quick results and know what to do next. Let’s explore how this tool helps you make better health decisions!
  • What is BMI?
⦿ BMI, or Body Mass Index, is a number based on your weight and height. It helps you find out if you have a healthy weight for your body type.
 
⦿ To calculate it, divide your weight in kilograms by your height in meters squared. This gives an idea of your body fat in relation to your size.
 
⦿ Though BMI gives useful information, it doesn’t show the full picture of your health. Things like muscle mass, bone density, and fat distribution are also important. So, BMI is just one part of understanding your health.
  • BMI Chart
Below is the BMI chart provides a detailed Body Mass Index (BMI) that visually represents BMI values based on a person’s height and weight.
BMI Chart

What is a BMI Calculator?

⦿ A BMI Calculator helps you calculate your body mass index, which shows if your weight is healthy for your height. It uses simple measurements like weight in kilograms and height in meters.
 
⦿ The calculator gives instant results and places your BMI into categories such as underweight, normal weight, overweight, or obesity. It’s easy to access online or through apps.
 
⦿ This tool can help you track your health over time. Many people use it for quick insights into their overall health without needing complicated medical exams.

Why Use a BMI Calculator?

⦿ A BMI calculator quickly shows your health status. It’s an easy tool that only asks for your height and weight to see if you fall within a healthy range. Its simplicity makes it accessible to anyone.
 
⦿ Watching your BMI change over time can help you understand your body better. Regular checks can show patterns, motivating you to make healthier choices.
 
⦿ Knowing your BMI is also helpful for discussions with doctors about any health risks or necessary steps. It’s not just about the numbers—it’s about being in control of your health and making informed decisions.

How to Calculate BMI?

Calculating your BMI is simple and helps you understand if your weight falls within a healthy range. Follow these steps to determine your BMI accurately.
  • Gather your measurements
⦿ Weight in kilograms (kg): If you have your weight in pounds, convert it by dividing the number by 2.205.
 
⦿ Height in meters (m): If your height is in inches, convert it by dividing the number by 39.37.
  • Use the BMI formula
BMI = weight (kg) / (height (m))²
  • Example calculation
⦿ If you weigh 70 kg and are 1.75 m tall, the formula would be:
    • BMI = 70 / (1.75 × 1.75)
    • Result: BMI = 22.86

How to Use the BMI Calculator?

Using a BMI calculator is easy and fast.
 
⦿ Start by gathering your height and weight. Make sure to use the correct units—metric (kilograms and meters) or imperial (pounds and inches).

⦿ Then, enter your details into the calculator. Most online calculators have fields for both height and weight. After entering the information, click the calculate button.

⦿ Your BMI will appear along with an explanation of what it means. This can help you know if you’re in a healthy range or if lifestyle changes are needed based on your BMI result.

BMI Ranges

BMI is classified into five key categories, which help you understand if your weight is within a healthy range. These categories are based on the BMI scale, which compares weight to height. The categories are:
  • Underweight
A BMI under 18.5 means you’re underweight and may need to gain weight for better health.
  • Normal weight
A BMI between 18.5 and 24.9 is considered healthy, indicating a good balance between height and weight.
  • Overweight
A BMI from 25 to 29.9 suggests you’re carrying extra weight, which could lead to health issues.
  • Obesity
A BMI between 30 and 35 signals obesity, which increases the risk of heart disease and diabetes.
  • Severe obesity
A BMI above 35 is severe obesity, which greatly raises the risk of serious health problems.

BMI Table & Chart For Adults

This is the World Health Organization’s (WHO) guideline for healthy body weight, based on BMI values for adults. It applies to both men and women aged 20 and above.
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
Here is a BMI chart for adults, showing the relationship between height (in meters) and weight (in kilograms). The chart categorizes different BMI ranges:
BMI chart for adults

BMI Table & Chart For Children and Teens

The Centers for Disease Control and Prevention (CDC) recommends using BMI categories to assess the weight of children and teens aged 2 to 20.
Category Percentile Range
Underweight < 5%
Healthy weight 5% - 85%
At risk of overweight 85% - 95%
Overweight > 95%
Here’s a BMI-for-age percentile chart for boys aged 2 to 20 years. It includes percentiles such as the 5th, 10th, 25th, 50th, 75th, 85th, 90th, and 95th. This chart helps track the typical BMI patterns for boys, with each line showing a different percentile for their age.
BMI for age percentile chart for boys
Here’s a BMI-for-age percentile chart for girls aged 2 to 20 years. It includes percentiles such as the 5th, 10th, 25th, 50th, 75th, 85th, 90th, and 95th. This chart helps track the typical BMI distribution for girls, with each line showing a different percentile for their age.
BMI for age percentile chart for girls

Health Risks Related to Being Overweight

Being overweight can lead to a number of serious health problems. Some of the most common risks include:
  • Heart disease
  • High blood pressure
  • Stroke
  • Type 2 diabetes
  • Sleep apnea and breathing difficulties
  • Joint pressure leading to osteoarthritis
  • Cancers like breast, colon, and endometrial
  • Fatty liver disease
  • Gallbladder disease
  • Hormonal imbalances impacting fertility and periods
  • Kidney disease
  • GERD (Gastroesophageal reflux disease)
  • Breathing issues and reduced lung function
  • Mental health problems such as anxiety and depression
  • Skin issues like infections and rashes

Health Risks Related to Being Underweight

Being underweight can also pose significant health challenges, often leading to deficiencies and other complications. Below are some of the most common health risks associated with being underweight.
  • Risk of malnutrition
  • Weak immune system and frequent infections
  • Osteoporosis and bone fractures due to low bone density
  • Anemia and iron deficiency
  • Fertility problems and irregular periods
  • Fatigue and low energy levels
  • Hair loss and brittle nails
  • Muscle weakness and reduced muscle mass
  • Vitamin deficiencies such as vitamin D and calcium
  • Delayed wound healing
  • Heart problems like low blood pressure and irregular heartbeat
  • Risk of hypothermia due to low body fat
  • Digestive issues like bloating and constipation
  • Mental health problems such as anxiety and depression
  • Complications during surgery or recovery

Tips for Maintaining Optimum Health

  • Eat a balanced diet filled with whole foods like fruits, vegetables, lean proteins, and healthy fats.
  • Keep yourself hydrated to support overall bodily functions.
  • Include at least 150 minutes of moderate exercise each week in your routine.
  • Choose activities you enjoy, such as walking or cycling, to make it easier to stay active.
  • Practice stress management techniques like meditation or yoga for emotional well-being.
  • Prioritize getting enough sleep to maintain energy and improve brain function.

Limitations of BMI (Body Mass Index)

⦿ Doesn’t separate muscle and fat: BMI doesn’t distinguish between lean muscle and body fat, leading to possible misclassification for those with more muscle.
 
⦿ Overlooks fat distribution: It doesn’t account for where fat is stored, missing potential health risks, especially with abdominal fat.
 
⦿ Not suitable for all groups: BMI accuracy can differ for children, older adults, and people from different ethnic backgrounds.
 
⦿ Excludes other health factors: It doesn’t include important health measurements like cholesterol, blood pressure, or blood sugar.
 
⦿ No adjustment for age or gender: BMI doesn’t account for differences in body composition related to age or gender.

What is the BMI formula?

⦿ BMI is a simple calculation used to measure your weight compared to your height. To calculate your BMI, divide your weight in kilograms by the square of your height in meters: BMI = weight (kg) / (height (m))².
⦿ For those using pounds and inches, multiply your weight in pounds by 703 and divide by the square of your height in inches.
This gives a quick estimate of whether you’re underweight, normal weight, overweight, or obese based on BMI categories.
 
Below are examples of how to calculate BMI using both units for a 6’0″, 180-pound individual.
Body Mass Index BMI formula
This calculation shows that a person who is 6’0″ and weighs 180 pounds has a BMI of 24.4, which falls within the normal weight range.

What is the BMI Prime Formula?

⦿ BMI prime is a modified version of the BMI formula that helps assess weight relative to height. It can make it easier for some individuals to understand their body composition.
 
⦿ The formula divides your BMI by 25, the upper limit of the normal weight range. The result indicates how far you are from this healthy threshold.
 
⦿ For example, if your BMI is 30, dividing by 25 gives a BMI prime of 1.2. This can help in setting weight management and health goals.
 
BMI prime is a dimensionless ratio of two BMI values. A BMI prime below 0.74 indicates underweight, 0.74 to 1 is normal, above 1 is overweight, and over 1.2 is classified as obese. The table below shows weight classifications based on BMI prime:
Classification BMI BMI Prime
Severe Thinness < 16 < 0.64
Moderate Thinness 16 - 17 0.64 - 0.68
Mild Thinness 17 - 18.5 0.68 - 0.74
Normal 18.5 - 25 0.74 - 1
Overweight 25 - 30 1 - 1.2
Obese Class I 30 - 35 1.2 - 1.4
Obese Class II 35 - 40 1.4 - 1.6
Obese Class III > 40 > 1.6

What is Ponderal Index?

⦿ The Ponderal Index (PI) is a measure similar to BMI, used to assess body type based on height and weight. However, PI uses height cubed, while BMI uses height squared. While BMI is useful for large groups, it can sometimes fail to accurately represent an individual’s body composition, especially for very tall or short people.
 
⦿ PI is often a better indicator of leanness or body fat in these cases where BMI may be misleading.
Ponderal Index PI
For instance, a person who is 6’0″ (72 inches) tall and weighs 180 lbs (81.65 kg) would have a Ponderal Index of 12.7. This gives an alternative measure to BMI for evaluating body mass relative to height.

Frequently Asked Questions

A BMI Calculator is a tool that helps calculate your Body Mass Index based on your height and weight. It’s used to determine if your weight is in a healthy range.

Simply enter your weight and height into the calculator, and it will compute your BMI, telling you if you’re underweight, at a healthy weight, overweight, or obese.

BMI is a useful screening tool, but it doesn’t account for body composition factors such as muscle mass and fat distribution. It’s best used alongside other health assessments.

A BMI of 25 indicates that you are overweight, which may suggest an increased risk of health conditions such as heart disease and diabetes.

A healthy BMI falls between 18.5 and 24.9, indicating that your weight is within a range that promotes good health and reduces the risk of diseases.

Yes, BMI can be used for children, but it is adjusted for age and gender. It uses percentiles to help determine if a child is underweight, healthy, overweight, or obese.

BMI helps determine if you're in a healthy weight range, which is important for preventing many health issues such as heart disease, diabetes, and joint problems.

No, BMI only estimates weight based on height and doesn’t measure the actual body fat percentage. It doesn’t differentiate between fat and muscle mass.

If you have a lot of muscle mass, your BMI might be higher, suggesting overweight or obesity. However, BMI does not distinguish between muscle and fat.

BMI is used for older adults but may not be fully accurate due to changes in body composition with age. It’s helpful to consider other health measurements as well.

Dr Swati Shah

Dr. Swati Shah

MS, DrNB (Surgical Oncology)

Dr. Swati Shah is a renowned Robotic Uro and Gynecological Cancer Surgeon from Ahmedabad. He has 15+ years of extensive experience in pelvic oncosurgery and 10+ years of experience in robotic surgery. She treats cancers of kidney, bladder, prostate, uterus, ovaries and other pelvic organs.

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