Calculate your Body Mass Index instantly using our free BMI Calculator for men, women, teens & kids. Check if you are underweight, healthy, overweight, or obese by entering your height, weight, age & gender.
One of the key steps to a healthy and disease-free life is maintaining a healthy body weight. The BMI Calculator, also known as the Body Mass Index Calculator, allows you to instantly determine whether your weight is healthy for your height and age. It's an easy yet effective tool that doctors, fitness professionals, and health professionals worldwide trust.
Use our BMI calculator for free to quickly check your body mass index — for men, women, adults, teenagers, and children. It's based on height (cm/ft) and weight (kg/lbs), and it tells you whether you are underweight, healthy, overweight, or obese.
BMI (Body Mass Index) is a number that shows the relationship between your weight and height. It gives you an approximation of your body fat and indicates whether you're at a healthy weight for your body.
The formula for BMI is:
BMI = Weight (kg) ÷ [Height (m)]²
For instance, if you weigh 70 kg and have a height of 1.75 m,
→ BMI = 70 ÷ (1.75 × 1.75) = 22.86
As per the BMI chart, a BMI of 22.86 belongs to the "Healthy" range.
The following is how BMI outcomes are read for adults:
| BMI Range | Category | Health Meaning |
| Below 18.5 | Underweight | May indicate malnutrition or low body fat |
| 18.5 – 24.9 | Healthy Weight | Normal and balanced body weight |
| 25 – 29.9 | Overweight | Higher risk of lifestyle diseases |
| 30 and above | Obese | Significantly increased health risk |
It depends on your choice of measurement system, but calculate BMI online in either of two ways:
BMI = weight (kg) / [height (m)]²
BMI = [weight (lbs) / height (in)²] × 703
Our BMI Calculator does both for you — pick between kg/cm or lbs/ft inputs for quick results.
Knowing your Body Mass Index is significant since it provides you with an idea of your general health and potential risks relating to being underweight or overweight.
Heart Health: An elevated BMI may raise the risk of heart disease and high blood pressure.
Risk of Diabetes: Overweight and obesity increase the risk of Type 2 diabetes.
Bone and Joint Well-being: Weight gain can lead to joint ache, arthritis, and movement problems.
Nutrition Insight: A low BMI may indicate under-nutrition, particularly in children or old individuals.
BMI is not a full diagnostic but it's an excellent starting point to assess your healthiness and lifestyle.
SEO Pheonix BMI Calculator is for all people — kids and elderly alike. Choose your gender (male/female), age category, and input your height and weight to receive individualized BMI results.
Healthy BMI range: 18.5–24.9
Utilize this to monitor overall health and body composition.
During puberty, BMI varies by age and sex.
For adolescents, BMI percentile charts are employed instead of absolute values.
Children's BMI is compared with percentile growth charts that take age and gender into consideration.
Assists in tracking healthy growth and nutrition.
Our calculator is used for everyone: BMI calculator female, BMI calculator male and BMI calculator for kids.
Our free BMI calculator kg steps tutorial:
Choose Gender: Male or Female
Select Age Group: Adult, Teen, or Child
Enter Weight: in kilograms (kg) or pounds (lbs)
Enter Height: in centimeters (cm) or feet (ft/in)
Click “Calculate BMI”
Get an instant display of your BMI value and category (Underweight, Healthy, Overweight, or Obese)
Tip: Continuously update your BMI every few months to monitor your progress towards fitness targets.
| Example | Weight | Height | BMI | Result |
| Adult Male | 70 kg | 175 cm | 22.9(BMI for men) | Healthy |
| Adult Female | 85 kg | 160 cm | 33.2(BMI for women) | Obese |
| Teen (Boy) | 50 kg | 165 cm | 18 | Underweight |
| Teen (Girl) | 55 kg | 160 cm | 22 | Healthy |
Maintaining and achieving a healthy BMI is not a matter of crash dieting — it's all about lasting lifestyle modifications.
Tips to Reduce BMI (If Overweight)
Eat a balanced, calorie-managed diet
Exercise for a minimum of 30–45 minutes a day
Hydrate with plenty of water and avoid sweetened beverages
Cut back on fast foods and packaged snacks
Get adequate sleep (7–8 hours at night)
How to Boost BMI (If Underweight)
Consume calorie-rich and protein-rich foods
Add healthy fats such as nuts, avocados, and olive oil
Do strength training exercises
Consume regular, small-sized meals throughout the day
Monitor your progress with the BMI Calculator from time to time
While BMI is a common indicator, it has certain limitations:
❌ Fails to differentiate between muscle and fat
❌ May not be appropriate for athletes or bodybuilders
❌ Does not account for body shape, ethnicity, or gender differences
That’s why it’s important to use BMI as a general guideline, not a diagnostic measure. For a full health assessment, consider checking body fat percentage, waist circumference, or consulting a healthcare professional.
A high BMI is associated with several health concerns, including:
Type 2 diabetes
Hypertension (high blood pressure)
Heart diseases
Stroke
Sleep apnea
Osteoarthritis
Certain cancers
On the contrary, low BMI may cause:
Weakened immunity
Osteoporosis
Malnutrition
Fertility problems
Global BMI Statistics (WHO Data)
As per the World Health Organization (WHO):
More than 1.9 billion adults globally are overweight.
Over 650 million are obese.
Obesity among children has risen tenfold over the last 40 years.
This indicates the significance of tools such as BMI calculators in raising health awareness.
Your body needs the correct balance — neither too heavy, nor too light. The BMI Calculator on SEO Pheonix assists you in determining that balance immediately. As an adult, teenager, or parent tracking your child's development, you can get precise information on your weight and health condition using this tool.
Begin today — get an instant check of your BMI and take the first step towards a healthier living!
A healthy or normal BMI for an adult is 18.5 to 24.9.
It is best to calculate your BMI on BMI Calculator on SEO Pheonix every 3 to 6 months, particularly if you are on a diet or fitness regimen.
Calculation is the same, but interpretation will vary marginally because of differences in body composition.
No. Children and adolescents use age- and gender-adjusted percentile BMI charts.
In such a case, BMI may overestimate body fat. You can use a body fat calculator or get information from a fitness professional to get accurate measurements.