Calculate your Body Mass Index easily with the BMI Calculator. Input your height and weight for accurate results. Ideal for tracking health and fitness goals.

Date of Birth
Height Unit

The BMI Calculator is a practical tool designed to help you quickly and accurately determine your Body Mass Index (BMI). By entering your age, height, and weight, you can calculate your BMI, which serves as an indicator of your overall health and fitness level. This easy-to-use calculator is perfect for those aiming to monitor their weight, manage fitness goals, or understand their body composition. Use this tool to gain valuable insights into your health and well-being.

How to Use the BMI Calculator

Step 1: Select Your Gender

Locate the gender selection section at the top. Click on either the “Male” or “Female” radio button.

Step 2: Enter Your Age or Date of Birth

Find the “Age” field or the “Date of Birth” field. Enter your age in the “Age” field or click on the calendar icon to select your date of birth.

Step 3: Choose Height Unit

Locate the “Height Unit” dropdown menu. Select your preferred unit for height (Feet and Inches or Meters and Centimeters).

Step 4: Enter Your Height

Input your height in the appropriate fields. If you selected “Feet and Inches,” fill in both the “Feet” and “Inches” boxes.

Step 5: Enter Your Weight

Find the “Weight” field below the height section. Enter your weight and select the unit (Kilograms or Pounds) from the dropdown menu.

Step 6: Calculate BMI

Click the purple “Calculate” button. Wait for the tool to process your input and display your Body Mass Index (BMI) result on the screen.

BMI Table for Adults

Body Mass Index (BMI) is a useful measure of whether a person is underweight, normal weight, overweight, or obese. Here is a standard BMI table for adults:

BMI RangeWeight Status
Below 18.5Underweight
18.5 – 24.9Normal weight
25.0 – 29.9Overweight
30.0 – 34.9Obesity Class I
35.0 – 39.9Obesity Class II
40.0 and aboveObesity Class III

Understanding BMI Categories:

  • Underweight: A BMI below 18.5 indicates a weight that is lower than what is considered healthy for the individual’s height.
  • Normal weight: A BMI between 18.5 and 24.9 is considered healthy.
  • Overweight: A BMI between 25.0 and 29.9 indicates a weight that is higher than the healthy range.
  • Obesity Class I: A BMI between 30.0 and 34.9 is classified as moderate obesity.
  • Obesity Class II: A BMI between 35.0 and 39.9 is classified as severe obesity.
  • Obesity Class III: A BMI of 40.0 or higher is classified as very severe or morbid obesity.

BMI Table for Teenagers:

BMI PercentileWeight Status
Below 5th percentileUnderweight
5th to 85th percentileHealthy weight
85th to 95th percentileOverweight
Above 95th percentileObesity

Understanding BMI Percentiles:

  • Underweight (Below 5th Percentile): A teenager with a BMI below the 5th percentile for their age and gender is considered underweight.
  • Healthy Weight (5th to 85th Percentile): A BMI between the 5th and 85th percentiles is considered a healthy weight for a teenager’s age and gender.
  • Overweight (85th to 95th Percentile): A BMI between the 85th and 95th percentiles indicates that the teenager is overweight.
  • Obesity (Above 95th Percentile): A BMI above the 95th percentile is classified as obesity.

BMI Formula

Body Mass Index (BMI) is a simple calculation using a person’s height and weight. The formula for BMI is:

BMI=weight (kg)/height (m)2

For those using pounds and inches:

BMI=weight (lbs)×703/height (in)2

Risks associated with being overweight

  1. Increased risk of heart disease and stroke
  2. Higher likelihood of developing type 2 diabetes
  3. Greater chance of experiencing high blood pressure
  4. Increased risk of certain cancers (e.g., breast, colon, kidney)
  5. Greater incidence of respiratory issues like sleep apnea
  6. Higher probability of developing osteoarthritis
  7. Increased likelihood of liver and gallbladder diseases
  8. Greater risk of experiencing mental health issues such as depression and anxiety
  9. Higher chance of complications during pregnancy and childbirth
  10. Increased likelihood of developing metabolic syndrome

Risks associated with being underweight

  1. Higher risk of nutritional deficiencies
  2. Increased susceptibility to infections and illnesses
  3. Greater likelihood of experiencing osteoporosis and bone fractures
  4. Higher probability of anemia due to iron deficiency
  5. Increased risk of fertility issues and complications during pregnancy
  6. Greater incidence of weakened immune system
  7. Higher chance of experiencing fatigue and low energy levels
  8. Increased likelihood of hair loss and skin problems
  9. Greater risk of heart irregularities and cardiovascular issues
  10. Higher chance of experiencing delayed wound healing and recovery

Limitations of BMI

  1. Does not distinguish between muscle and fat mass
  2. May misclassify muscular individuals as overweight or obese
  3. Does not account for distribution of fat in the body
  4. Can underestimate health risks for people with normal BMI but high body fat percentage
  5. Does not consider age, sex, or ethnicity variations
  6. May not accurately reflect the health of older adults
  7. Can be misleading for children and adolescents whose bodies are still developing
  8. Does not take into account lifestyle factors and overall fitness level
  9. Cannot assess specific health conditions or metabolic health
  10. May not be suitable for athletes with higher muscle mass

How accurate is BMI?

BMI is a good general indicator but not always accurate for everyone. It does not differentiate between muscle and fat, so athletes or muscular individuals may have a high BMI despite having low body fat.

Is BMI a reliable indicator of health?

BMI is a useful screening tool but has limitations. It does not account for muscle mass, fat distribution, or individual differences in age, sex, or ethnicity. It should be used in conjunction with other health assessments.

Can children and teenagers use the BMI calculator?

Yes, but BMI interpretations differ for children and teenagers. Pediatric BMI percentiles, based on age and sex, should be used to determine weight categories.

Does BMI differ for men and women?

The BMI calculation is the same for men and women, but interpretations may vary as women generally have more body fat than men of the same BMI.

What should I do if my BMI is in the obese category?

If your BMI falls in the obese category, it is advisable to consult with a healthcare provider. They can help you develop a comprehensive plan that includes dietary changes, physical activity, and other lifestyle modifications to improve your health.